6468( 3) - 02/07/96 14:53 - [ 1]
PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only
ID: 6468
Version: 3
Check-in Date: 07-Feb-1996
14:40:37
1.Proposal Title:
HD 98800, An Extraordinary K Star: Completion of the Astrometry in Cycle 6
------------------------------------------------------------------------------------
2. Scientific Category 3. Proposal For 4. Cycle
BINARIES AND STAR FOR GO 6
------------------------------------------------------------------------------------
5. Investigators
Contact?
PI: David Soderblom Space Telescope Science Institute
CoI: Keith Noll Space Telescope Science Institute N
CoI: Christopher Burrows Space Telescope Science Institute N
CoI: David Latham Harvard-Smithsonian Ctr. for Astrophys. N
CoI: Guillermo Torres Harvard-Smithsonian Ctr. for Astrophys. N
CoI: Robert Stefanik Harvard-Smithsonian Ctr. for Astrophys. N
CoI: Fritz Benedict McDonald Observatory N
CoI: Todd Henry Space Telescope Science Institute N
CoI: Robert Brown Space Telescope Science Institute N
------------------------------------------------------------------------------------
6. Abstract
This proposal seeks HST observations to complete a program begun in Cycle 5. In
particular, we need 2 orbits to complete FGS observations to get the parallaxes of
both the visible objects in this probable binary. HD 98800 is a nearby K star
(possibly a dwarf at about 12 pc or maybe a pre-main sequence star at 30 to 35 pc)
that is extraordinary because at least 10\ reradiated in the infrared. Basic
geometry tells us that that material must form a very thick disk, yet such disks
collapse very quickly. How then is the disk's thickness maintained? What kind of
star is HD 98800? More precisely, what kind of stars are HD 98800, for there are, in
fact, two visible objects, and each of these is a spectroscopic binary. How did this
system, which is probably very young, come to be in the immediate solar
neighborhood?
------------------------------------------------------------------------------------
6468( 3) - 02/07/96 14:53 - [ 2]
Observations Description
------------------------
FGS Observations: To determine the parallaxes of the two visible objects we
need to use the FGSs in POS mode. Fritz Benedict is our expert in this area and
he has determined that there are 6 reference objects nearby that are brighter
than V=16. We will need three visits 6 months apart of two orbits each. The
first two visits are to be done in Cycle 5, and it is the third that is
requested in this proposal. This should provide one milliarcsec precision for
the parallaxes.
Real Time Justification
-----------------------
None. None.
Calibration Justification
-------------------------
Additional Comments
-------------------
------------------------------------------------------------------------------------
Data Distribution
Media: 8MM
Blocking Factor: 10
Ship To: G. Fritz Benedict*McDonald
Observatory*University of Texas*Austin,
TX 78712
Ship Via: UPS
Email: fritz@clyde.as.utexas.edu ,
------------------------------------------------------------------------------------
6468( 3) - 02/07/96 14:53 - [ 3]
TARGET LIST a) Fixed Targets
------------------------------------------------------------------------------------------------------------------------------------
Tar| Target | Target | Target |Coord | Radial | Flux data
No | Name | Description | Position |Eqnx | Vel. |
------------------------------------------------------------------------------------------------------------------------------------
1 HD98800 STAR RA=170.5243708D +/- 0.00014D, J2000 V = 8.9+/-0.1
DEC= -24.7778389D +/- 0.00014D
Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec)
1976.42 -0.0065 -0.023 0.04
2 HD98800-2- CALIBRATION,ASTROMETRIC RA=170.5621917D +/- 0.00014D, J2000 V = 15.4+/-0.2
REF , DEC= -24.8181669D +/- 0.00014D
Comments: STAR 82 IN GFB LIST
4 HD98800-4- CALIBRATION,ASTROMETRIC RA=170.5234708D +/- 0.00014D, J2000 V = 15.4+/-0.2
REF , DEC= -24.7653939D +/- 0.00014D
Comments: STAR 144 IN GFB LIST
5 HD98800-5- CALIBRATION,ASTROMETRIC RA=170.4876458D +/- 0.00014D, J2000 V = 10.8+/-0.2
REF , DEC= -24.7257781D +/- 0.00014D
Comments: STAR 180 IN GFB LIST
6468( 3) - 02/07/96 14:53 - [ 4]
Visit: 01
Visit Requirements: BETWEEN 25-DEC-1996:00:00:00 AND 31-DEC-1996:23:22:27; ORIENT 315.0D to
317.0D;
On Hold Comments: <none>
Additional Comments: <none>
Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
10 HD98800 FGS POS 3 F583W 1 52S POS TARG 0.0, 0.0;MAX DUR 52S SEQ 10-91 NON
-INT;SEQ 100-191 NON-INT;
Comments: FINE LOCK GUIDING: Denise, in order to
schedule Visit 1 you will need to delete the
last observation (maybe 2?) in each orbit.
------------------------------------------------------------------------------------------------------------------------------------
20 HD98800-5- FGS POS 3 F583W 1 32S MAX DUR 32S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
30 HD98800-4- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
40 HD98800-2- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
51 HD98800 FGS TRANS 3 F583W SCANS=15,STEP- 1 750S
SIZE=1
Comments: FINE LOCK GUIDING
------------------------------------------------------------------------------------------------------------------------------------
60 HD98800 FGS POS 3 F583W 1 52S MAX DUR 52S
Comments: FINE LOCK GUIDING
------------------------------------------------------------------------------------------------------------------------------------
70 HD98800-5- FGS POS 3 F583W 1 32S MAX DUR 32S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
80 HD98800-4- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
90 HD98800-2- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
6468( 3) - 02/07/96 14:53 - [ 5]
Exposures
------------------------------------------------------------------------------------------------------------------------------------
Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
------------------------------------------------------------------------------------------------------------------------------------
91 HD98800-5- FGS POS 3 F583W 1 32S MAX DUR 32S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
100 HD98800 FGS POS 3 F583W 1 52S POS TARG 0.0, 0.0;MAX DUR 52S SEQ 10-91 NON
-INT
Comments: FINE LOCK GUIDING
------------------------------------------------------------------------------------------------------------------------------------
120 HD98800-5- FGS POS 3 F583W 1 32S MAX DUR 32S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
130 HD98800-4- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
140 HD98800-2- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
151 HD98800 FGS TRANS 3 F583W SCANS=15,STEP- 1 750S
SIZE=1
Comments: FINE LOCK GUIDING
------------------------------------------------------------------------------------------------------------------------------------
160 HD98800 FGS POS 3 F583W 1 52S MAX DUR 52S
Comments: FINE LOCK GUIDING
------------------------------------------------------------------------------------------------------------------------------------
170 HD98800-5- FGS POS 3 F583W 1 32S MAX DUR 32S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
180 HD98800-4- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
190 HD98800-2- FGS POS 3 F583W 1 52S MAX DUR 52S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
191 HD98800-5- FGS POS 3 F583W 1 32S MAX DUR 32S
REF
Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE
ASTROMETRY PICKLE
------------------------------------------------------------------------------------------------------------------------------------
6468( 3) - 02/07/96 14:53 - [ 6]
Summary Form for Proposal 6468
Item Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
Configurations FGS
------------------------------------------------------------------------------------------------------------------------------------
Opmodes POS TRANS
------------------------------------------------------------------------------------------------------------------------------------
Optional Parameters SCANS=15 STEP-SIZE=1
------------------------------------------------------------------------------------------------------------------------------------
Proposal Category GO
------------------------------------------------------------------------------------------------------------------------------------
Scientific Category BINARIES AND STAR FORMATION
------------------------------------------------------------------------------------------------------------------------------------
Special Requirements BETWEEN 25-DEC-1996 00 00 00 AND 31-DEC-1996 23 22 27; ORIENT 315.0D to 317.0D; POS TARG 0.0,
0.0;MAX DUR 52S SEQ 10-91 NON-INT;SEQ 100-191 NON-INT; MAX DUR 32S MAX DUR 52S POS TARG 0.0,
0.0;MAX DUR 52S SEQ 10-91 NON-INT
------------------------------------------------------------------------------------------------------------------------------------
Spectral Elements F583W
------------------------------------------------------------------------------------------------------------------------------------
Target Names HD98800 HD98800-5-REF HD98800-4-REF HD98800-2-REF
------------------------------------------------------------------------------------------------------------------------------------