! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template
! $Id: 6421,v 4.1 1996/03/08 14:22:52 pepsa Exp $
! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template
! $Id: 6421,v 4.1 1996/03/08 14:22:52 pepsa Exp $
!
! Refer to the HST Phase II Proposal Instructions to fill this out
!
! Anything after a "!" is ignored, and may be deleted
!
! All keywords with multiple entries are comma delimited except the
! Visit_Requirements and Special_Requirements keywords which can be
! delimited with carriage returns or semi-colons, but not commas
!
! For help call your Program Coordinator: Landis
! Phone: 410-338-4560 , E-mail: landis@stsci.edu
!
! This partially completed template was generated from a Phase I proposal.
! Name of Phase I Proposal: archive-0070.schmidt.prop
! Date generated: Fri Dec 22 15:52:09 EST 1995
!
Proposal_Information ! Section 4
Title: Resolving the Unique Magnetic/Non-
Magnetic Double-Degenerate Binary LB
11146
Proposal_Category: GO
Scientific_Category: BINARIES AND STAR FORMATION
Cycle: 6
Investigators
PI_name: Gary Schmidt
PI_Institution: University of Arizona
CoI_Name: James Liebert
CoI_Institution: University of Arizona
Contact: ! Y or N (designate at most one contact)
CoI_Name: Paul Smith
CoI_Institution: University of Arizona
Contact: Y ! Y or N (designate at most one contact)
Abstract: ! Free format text (please update)
LB 11146 is an unresolved binary of unknown period consisting
of a nonmagnetic (B_e < 30 kG) white dwarf plus a component
with one of the strongest magnetic fields yet found on a white
dwarf (B_e ~ 700 MG). The magnetic star also possesses a
different atmospheric composition than its hydrogen-dominated
companion, as it exhibits several broad spectral features that
cannot be attributed to hydrogen in the presence of a strong
magnetic field. Finally, the binary is the only known double-
degenerate system where the total mass exceeds the
Chandrasekhar limit. Knowledge of the current component
separation is critical for understanding whether the peculiar
end-state of this binary is a result of differences in the
star-formation process or of a peculiar mass-transfer or
common-envelope effect. Radial velocity studies appear to
preclude short periods (a \lta 0.1 AU), while ground-based
images are unresolved at the limit of ~20 AU. We propose to
investigate the important region 2-20 AU ("s0.05-"s0.5)
through FOC imaging. Frames obtained at two different
wavelengths and covering just one HST orbit will distinguish
between the two components and at the same time test a model
of LB 11146 based on a spectroscopic decomposition of the
binary.
Questions ! Free format text (please update)
Observing_Description:
Simulations based on the known combined spectral flux of the
two components and of the point-spread function of HST+FOC
have demonstrated that the goals of this project can be
reached with just two FOC/96 (512*512) images; one a 1200 s
exposure using the F307M+F6ND filters; the other of 600 s
duration using F550M+F2ND. These filter combinations ensure
that the count rate will be linear even if the binary is not
resolved. The exposure time has been set so that a signal-to-
noise-ratio of at least 40 is reached for each component
assuming the fluxes derived in the Liebert et al. (1993)
model. ``FOCSIM'' calculations estimate ~340 counts in the
central pixel for each star in the F550M+F2ND observation.
For F307M+F6ND in 1200 s, we expect ~180 cts and ~360 cts in
the central pixel for the nonmagnetic and magnetic
components, respectively. In both exposures the background is
<=sssim1 count. The target will be acquired using the ``Blind
Pointing'' procedure (Mode III target acquisition). The
images will only require 1 orbit to acquire. No special
calibrations will be needed. begintabularlll Cycle 6 &
Primary Orbits:1 & Exposures:2, endtabular
Real_Time_Justification:
None.
None.
Calibration_Justification: ! Move appropriate text from Real_Time_Justification
Additional_Comments:
Fixed_Targets ! Section 5.1
Target_Number: 1
Target_Name: LB11146
Alternate_Names: PG0945+246
Description: STAR, Composite Spectral Type
Position: ! Most common specification format is
RA=09H 48M 46.74S +/- 1.0", ! RA=0H 0M 0.00S +/- 0S,
DEC=24D 21' 27.46" +/- 1.0", ! DEC=0D 0' 0.0" +/- 0",
PLATE-ID=01X3 ! PLATE-ID=0000
Equinox: J2000
RV_or_Z:
RA_PM: ! Units are seconds of time per year
Dec_PM: ! Units are seconds of arc per year
Epoch:
Annual_Parallax:
Flux: V=14.4 +/- 0.1, B-V=-0.15 ! Include at least V and B-V
Comments:
! This is a template for a single visit containing a single exposure
! Repeat exposure and visit blocks as needed
Visits ! Section 6
Visit_Number: 1
Visit_Requirements: ! Section 7.1
! Uncomment or copy visit level special requirements needed
! Most of these requirements (including ORIENT) will limit scheduling
! PCS MODE [Fine | Gyro]
! GUIDing TOLerance <angle>
! DROP TO GYRO IF NECESSARY [NO REACQuisition]
! ORIENTation <angle1> TO <angle2>
! ORIENTation <angle1> TO <angle2> FROM <visit>
! ORIENTation <angle1> TO <angle2> FROM NOMINAL
! SAME ORIENTation AS <visit>
! CVZ
! PARallel
! SCHEDulability <percentage>
! AFTER <visit> [BY <time1> [TO <time2>]]
! AFTER <date>
! BEFORE <date>
! BETWEEN <date1> AND <date2>
! GROUP <visit-list> WITHIN <time>
! PERIOD <time> AND ZERO-PHASE <date>
! SEQ <visit-list> WITHIN <time>
! ON HOLD [FOR <visit-list>]
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 1 ! Section 6.5
Target_Name: LB11146
Config: FOC/96
Opmode: IMAGE
Aperture: 512x512
Sp_Element: F550M,F2ND
Wavelength: 5460
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 700S
Special_Requirements: ! Section 7.2
Exposure_Number: 2
Target_Name: LB11146
Config: FOC/96
Opmode: IMAGE
Aperture: 512x512
Sp_Element: F307M,F6ND
Wavelength: 3080
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 1400S
Special_Requirements:
! Uncomment or copy exposure level special requirements needed
! INTeractive ACQuisition FOR <exp-list>
! ONBOARD ACQuisition FOR <exp-list>
! SAVE OFFSET <id>
! USE OFFSET <id>
! POSition TARGet <x-value>,<y-value>
! SAME POSition AS <exp>
! DO FOR TARGets <targ-list> ! FGS only
! PARallel WITH <exp>
! GROUP-FGS <exp-list> WITHIN <time>
! SPATIAL SCAN <#> [<exp-list> | SINGLE-EXP ]
! RT ANALYSIS [FOR <exp-list>]
! REQuires UPLINK
! REQuires EPHEMeris CORRection <id>
! END ORBIT
! EXPAND
! LOW-SKY
! MAXimum DURation [<time> | <%>]
! MINimum DURation [<time> | <%>]
! NO SPLIT
! PHASE <number1[0,1]> TO <number2[0,1]>
! SEQuence <exp-list> NON-INTerruptible
! SHADOW
Comments:
Data_Distribution ! Defaults indicated; change if desired
Medium: 8MM ! 8MM or 6250BPI or 1600BPI
Blocking_Factor: 10 ! 10 or 1
! Only astronomers with very old 9-
! track tape drives should consider
! a blocking factor of 1
Ship_To: PI_Address ! STSCI or PI_Address or <free-text>
! PI Address from Phase I is:
!
! Steward Observatory
! Tucson
! 85721
!
!
Ship_Via: UPS ! UPS (2-day) or OVERNIGHT
! Overnight shipping done at PI expense
Recipient_Email: ! Needed if Ship_To: is not PI_Address
! <free-text>
! Let us know what you think of this template and software!
! Please send a list of your likes and dislikes to your Program Coordinator