6751( 8) - 05/07/96 13:26 - [ 1]
PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only
ID: 6751
Version: 8
Check-in Date: 07-May-1996
13:10:02
1.Proposal Title:
Is the Central Star of K 648 in M15 a Close Binary?
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2. Scientific Category 3. Proposal For 4. Cycle
BINARIES AND STAR FOR GO 6
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5. Investigators
Contact?
PI: Howard E. Bond Space Telescope Science Institute
CoI: Laura K. Fullton Space Telescope Science Institute N
CoI: Mario Livio Space Telescope Science Institute N
CoI: Karen G. Schaefer Space Telescope Science Institute N
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6. Abstract
The planetary nebula K 648 is a member of the globular cluster M15, and is one of
only three PNe known in Galactic globular clusters. Pre-repair HST images reveal
that the nebula is strongly elliptical in shape, and shows blobs on either side of
the central star, similar to those seen around PNe in the field that contain close-
binary nuclei. Moreover, our study of archival frames of M15 suggests that the
central star of K 648 may be variable. We propose to obtain a series of WFPC2 images
of K 648 in U, B, V, and I, in order to ascertain whether the central star is a
close binary, and if so to determine its period and analyze its light curve. Close-
binary central stars in PNe provide the most direct evidence for common-envelope
(CE) evolution. Determination of the binary system parameters in a globular cluster,
where we know the age, distance, and progenitor masses, would provide completely
unique constraints on CE physics. The observations, if successful, would establish
the existence of the first pre-cataclysmic binary in a globular cluster, and would
shed light on the current problem that recent HST observations are revealing fewer
cataclysmic variables in globular clusters than expected from dynamical capture
processes.
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6751( 8) - 05/07/96 13:26 - [ 2]
Observations Description
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We will obtain a sequence of U,B,y,R,I observations of the central star of
K648, the planetary nebula in the globular cluster M15, in order to determine
whether it is a variable star due to being a close binary. In addition we will
carry out narrow-band imaging of the nebula in H-alpha and [O III]. The time
allocation is 11 orbits. In order to increase the scientific return we will
place the core of M15 in one of the WF chips and monitor it for variable stars.
This requires a specific spacecraft U3 roll angle near 30 degrees, and that all
frames be taken at the same roll angle once it is chosen. In order to cover
possible binary periods between about 2 hours and 10 days, the gaps between the
HST orbits must increase geometrically. The optimal strategy is to observe
during HST orbits 0, 1, 2, 4, 7, 12, 20, 31, 47, 70, and 100, counting from an
arbitrary starting point. SAA passages must not be allowed to interrupt this
sequence. WE BELIEVE THIS SCHEDULING, THOUGH DEMANDING, CAN BE DONE IN A WINDOW
AROUND OCTOBER-NOVEMBER, or alternatively in August using a large off-nominal
roll angle. (August may be preferable in avoiding the SAA interruptions of the
orbit sequence.)
Real Time Justification
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Calibration Justification
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Additional Comments
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Data Distribution
Media: 8MM
Blocking Factor: 10
Ship To: PI_Address
Ship Via: UPS
Email: ,
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6751( 8) - 05/07/96 13:26 - [ 3]
TARGET LIST a) Fixed Targets
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Tar| Target | Target | Target |Coord | Radial | Flux data
No | Name | Description | Position |Eqnx | Vel. |
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1 K648 Star, planetary nebula RA=21H 29M 59.4S +/- 1", J2000 V = 14.5
central star; ISM, DEC=+12D 10' 24" +/- 1", PLATE- B-V = 0
planetary nebula ID=02V2
Comments: Planetary nebula in the globular cluster M15
6751( 8) - 05/07/96 13:26 - [ 4]
Visit: 01
Visit Requirements: ORIENTation 350D TO 90D
On Hold Comments: <none>
Additional Comments: We want to place K648 in the center of the PC, and have the core of M15
fall in one of the WF chips. The optimal ORIENT to achieve this is 30D, with
an acceptable range of 350D to 90D (but as close to 30D as possible). This
is the first visit, which observes K648 during 3 consecutive orbits, numbers
0, 1, and 2.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
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1 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S POS TARG 0.0, 0.0 MAXimum
DURation
Comments: Orbit 0 starts with this I exposure
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2 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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3 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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4 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S SAME POSition AS 1
MAXimum DURation
Comments: U exposure
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5 K648 WFPC2 IMAGE PC1 F675W CR-SPLIT=NO 1 400S SAME POSition AS 1
Comments: Long R exposure
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6 K648 WFPC2 IMAGE PC1 F675W CR-SPLIT=NO 1 500S SAME POSition AS 1
Comments: Long R exposure
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7 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S SAME POSition AS 1
MAXimum DURation
Comments: U exposure
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8 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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9 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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10 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S END ORBIT SAME POSition
AS 1 MAXimum DURation
SEQuence 1-10
NON-INTerruptible
Comments: I exposure. Orbit 0 ends here.
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6751( 8) - 05/07/96 13:26 - [ 5]
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
11 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: Orbit 1 starts with this I exposure
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12 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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13 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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14 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S SAME POSition AS 1
MAXimum DURation
Comments: U exposure
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15 K648 WFPC2 IMAGE PC1 F675W CR-SPLIT=DEF 1 1000S EXPAND SAME POSition AS 1
Comments: Long R exposure
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16 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S SAME POSition AS 1
MAXimum DURation
Comments: U exposure
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17 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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18 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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19 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S END ORBIT SAME POSition
AS 1 MAXimum DURation
SEQuence 11-19
NON-INTerruptible
Comments: I exposure. Orbit 1 ends here.
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21 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: Orbit 2 starts with this I exposure
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22 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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23 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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24 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S SAME POSition AS 1
MAXimum DURation
Comments: U exposure
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6751( 8) - 05/07/96 13:26 - [ 6]
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
25 K648 WFPC2 IMAGE PC1 F502N CR-SPLIT=NO 3 260S SAME POSition AS 1
MAXimum DURation
Comments: Three [O III] exposures
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26 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S SAME POSition AS 1
MAXimum DURation
Comments: U exposure
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27 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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28 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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29 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S END ORBIT SAME POSition
AS 1 MAXimum DURation
SEQuence 21-29
NON-INTerruptible
Comments: I exposure. Orbit 2 ends here. Visit ends
here.
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6751( 8) - 05/07/96 13:26 - [ 7]
Visit: 02
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 6.4H TO 6.5H
On Hold Comments: <none>
Additional Comments: This is the second visit, which observes K648 during orbit number 4
COUNTING FROM BEGINNING OF VISIT 1. This, and all subsequent visits, should
be at the same orientation chosen for Visit 1.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
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1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG 0.15, 0.0
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F502N CR-SPLIT=NO 1 260S SAME POSition AS 1
MAXimum DURation
Comments: Fourth [O III] exposure
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6 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 3 230S SAME POSition AS 1
MAXimum DURation
Comments: Three H-alpha exposures
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7 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S END ORBIT SAME POSition
AS 1 MAXimum DURation
SEQuence 1-7
NON-INTerruptible
Comments: An extra y exposure to fill out the orbit.
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6751( 8) - 05/07/96 13:26 - [ 8]
Visit: 03
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 11.2H TO 11.3H
On Hold Comments: <none>
Additional Comments: This is the third visit, which observes K648 during orbit number 7.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG 0.30, 0.15
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 230S SAME POSition AS 1
MAXimum DURation
Comments: Fourth short H-alpha exposure
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6 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1300S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-6
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 9]
Visit: 04
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 19.3H TO 19.4H
On Hold Comments: <none>
Additional Comments: This is the fourth visit, which observes K648 during orbit number 12.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG 0.30, 0.30
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1800S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-5
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 10]
Visit: 05
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 32.1H TO 32.3H
On Hold Comments: <none>
Additional Comments: This is the fifth visit, which observes K648 during orbit number 20.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG 0.15, 0.45
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1800S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-5
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 11]
Visit: 06
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 49.8H TO 50H
On Hold Comments: <none>
Additional Comments: This is the sixth visit, which observes K648 during orbit number 31.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG 0.0, 0.45
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1800S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-5
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 12]
Visit: 07
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 77.2H TO 77.4H
On Hold Comments: <none>
Additional Comments: This is the 7th visit, which observes K648 during orbit number 47.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG -0.15, 0.30
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1800S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-5
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 13]
Visit: 08
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 174.3H TO 174.5H
On Hold Comments: <none>
Additional Comments: This is the 8th visit, which observes K648 during orbit number 70.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG -0.15, 0.15
MAXimum DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
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4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1800S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-5
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 14]
Visit: 09
Visit Requirements: SAME ORIENTation AS 1 AFTER 1 BY 161H TO 161.2H
On Hold Comments: <none>
Additional Comments: This is the 9th and final visit, which observes K648 during orbit number
100.
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
1 K648 WFPC2 IMAGE PC1 F336W CR-SPLIT=NO 1 23S POS TARG 0.0, 0.0 MAXimum
DURation
Comments: U exposure
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2 K648 WFPC2 IMAGE PC1 F439W CR-SPLIT=NO 1 20S SAME POSition AS 1
MAXimum DURation
Comments: B exposure.
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3 K648 WFPC2 IMAGE PC1 F547M CR-SPLIT=NO 1 12S SAME POSition AS 1
MAXimum DURation
Comments: y exposure
------------------------------------------------------------------------------------------------------------------------------------
4 K648 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 14S SAME POSition AS 1
MAXimum DURation
Comments: I exposure.
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5 K648 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1800S END ORBIT SAME POSition
AS 1 EXPAND SEQuence 1-5
NON-INTerruptible
Comments: Orbit ends with long H-alpha exposure
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6751( 8) - 05/07/96 13:26 - [ 15]
Summary Form for Proposal 6751
Item Used in this proposal
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Configurations WFPC2
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Opmodes IMAGE
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Optional Parameters CR-SPLIT=NO CR-SPLIT=DEF
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Proposal Category GO
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Scientific Category BINARIES AND STAR FORMATION
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Special Requirements ORIENTation 350D TO 90D POS TARG 0.0, 0.0 MAXimum DURation SAME POSition AS 1 MAXimum DURation SAME
POSition AS 1 END ORBIT SAME POSition AS 1 MAXimum DURation SEQuence 1-10 NON-INTerruptible EXPAND
SAME POSition AS 1 END ORBIT SAME POSition AS 1 MAXimum DURation SEQuence 11-19 NON-INTerruptible
END ORBIT SAME POSition AS 1 MAXimum DURation SEQuence 21-29 NON-INTerruptible SAME ORIENTation AS
1 AFTER 1 BY 6.4H TO 6.5H POS TARG 0.15, 0.0 MAXimum DURation END ORBIT SAME POSition AS 1 MAXimum
DURation SEQuence 1-7 NON-INTerruptible SAME ORIENTation AS 1 AFTER 1 BY 11.2H TO 11.3H POS TARG
0.30, 0.15 MAXimum DURation END ORBIT SAME POSition AS 1 EXPAND SEQuence 1-6 NON-INTerruptible SAME
ORIENTation AS 1 AFTER 1 BY 19.3H TO 19.4H POS TARG 0.30, 0.30 MAXimum DURation END ORBIT SAME
POSition AS 1 EXPAND SEQuence 1-5 NON-INTerruptible SAME ORIENTation AS 1 AFTER 1 BY 32.1H TO 32.3H
POS TARG 0.15, 0.45 MAXimum DURation SAME ORIENTation AS 1 AFTER 1 BY 49.8H TO 50H POS TARG 0.0,
0.45 MAXimum DURation SAME ORIENTation AS 1 AFTER 1 BY 77.2H TO 77.4H POS TARG -0.15, 0.30 MAXimum
DURation SAME ORIENTation AS 1 AFTER 1 BY 174.3H TO 174.5H POS TARG -0.15, 0.15 MAXimum DURation
SAME ORIENTation AS 1 AFTER 1 BY 161H TO 161.2H
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Spectral Elements F814W F547M F439W F336W F675W F502N F656N
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Target Names K648
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