! Hubble Space Telescope Cycle 6 (OP1996) Phase II Proposal Template ! $Id: 6594,v 6.1 1996/03/29 19:22:03 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: Karla Peterson ! Phone: 410-338-4774 , E-mail: peterson@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. Proposal_Information ! Section 4 Title: White dwarf companions of Barium and CH peculiar Stars Proposal_Category: GO Scientific_Category: BINARIES AND STAR FORMATION Cycle: 6 Investigators PI_name: Erika Bohm-Vitense PI_Institution: University of Washington CoI_Name: Kenneth Carpenter CoI_Institution: Lasp/Goddard Space Flight Center, Code 681 Contact: ! Y or N (designate at most one contact) CoI_Name: Rich Robinson CoI_Institution: CSC at Goddard Space Flight Center, Code 681 Contact: ! Y or N (designate at most one contact) CoI_Name: Tom Ake CoI_Institution: CSC at Goddard Space Flight Center, Code 681 Contact: ! Y or N (designate at most one contact) CoI_Name: Jeff Brown CoI_Institution: University of Washington Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) In 1980 McClure et al.(ApJ 238, L35) discovered that all Ba stars show radial velocity variations indicative of their binary nature. These authors already suspected that the companions are white dwarfs. White dwarf companions were indeed detected for the Ba star zeta Cap and the mild Ba star zeta Cyg (Boehm-Vitense 1980, ApJ 239, L79) by means of IUE observations. Evidence for a high temperature radiation field was seen in the spectra of the mild Ba stars HR1016, 16Ser and 56UMa. If present, the white dwarf companions are too faint to be seen with IUE. We would like to look for them now with HST. It seems to us to be very important to check whether indeed all Ba stars have white dwarf companions. If so this makes it highly probable that the peculiar abundances are due to mass transfer from a very luminous companion to the present Ba star. After losing its envelope the luminous companion was left as the present white dwarf. This opens up the possibility that other peculiar abundances seen in other peculiar stars like the CH stars or perhaps also the weak G band stars might also be due to mass transfer. On the other hand if the white dwarfs are not found for all Ba stars we may have to look for other processes, that could bring to the surface of these stars material which has experienced the slow neutron capture process. Questions ! Free format text (please update) Observing_Description: We would like to observe the target Ba and some subgiant CH peculiar stars with the GHRS and the G140L in the 2" aperture in order to detect the white dwarf companions which are believed to be present. For the population I giants all the white dwarf companions should be observable, because they have not yet had time to cool down below 9500K. The GHRS appears to be the only instrument with which this can be done, because the filters for the WFPC2 have red leaks and so has the FOS. Since the white dwarfs are expected to be fainter by about 10 to 12 magnitudes than the Ba stars the scattered red light of the Ba stars would make it impossible to see the white dwarfs, even though the energy emitted in the UV by the Ba stars is expected to be low enough that it should not cause any problems. In order to make sure of this and to be able to correct for any UV light perhaps emitted by chromospheres of the Ba stars, we will need also observations of standard comparison stars known to have no companions. In this way we can check whether there is any continuous chromospheric emission, which has to be subtracted from the observed flux in order to find the continuum due to the white dwarf companion. (Any chromospheric emission of the Ba stars, continuous or line emission, would also give us a wrong UV signal for a possible white dwarf companion if we would attempt to use the WFPC2). The G140L appears to be sensitive enough to observe these faint stars and also give information about the energy distribution for the white dwarfs, from which their temperatures and ages can be determined. We will use the rapid read out method to reduce the noise. During the spare time in the acquisition orbit we will observe the CII] line region with the G270M. This will give us information about the chromospheres of these peculiar stars. In Table 1 we list our target stars. Table 1. Target stars Expos STAR time (min) HD Sp. Type Mv Mv(WD)^a (n=1) S/N n # orbits weak Ba stars 104979 G8III Bal 4.1 16.1 184 5 4 2 (CN-1, CH1) 133208 G8IIIa, Ba 0.4 3.5 15.5 105 5 2 3 215665 G8IIIa, Ba 0.3 3.95 16.0 160 5 4 2 Ba stars 65699 K2III Ba 5.11 17.1 468 5 4 4 16458 K1III Ba 5 5.76 17.8 840 5 8 4 116713 K0.5III Ba 3 5.09 17.1 437 5 6 3 101013 K0III Ba 5 6.15 18.2 439 3 6 3 46407 K0III Ba 3 6.24 18.2 475 3 6 3 weak G band star 165634 G5IV CH- 4.56 14.6^b 28 5 1 2 CH stars 89948 G5IV CH+ 7.7 17.7^b 500 3 5 2 Standard Stars^c 40808 K0III 3.96 70 3 2 163993 G8III 3.70 70 3 2 157347 G5IV 6.29 100 4 2 ^a Assuming T_eff(WD) ~ 10.000K, M_v (Ba star) ~ 0. ^b Assuming T_eff(WD) ~ 10,000K, M_v (G5IV) ~ 2. ^c We need exposure levels comparable to the ones estimated for the Ba stars of about equal brightness in order to see whether the Ba stars show intrinsic excess flux. Real_Time_Justification: IUE studies have been made several years ago to look for these companions. While a few white dwarf companions have been seen most of the Ba stars are too far away for cool white dwarf companions to be detected by IUE. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:HD104979-B Alternate_Names:o_Vir-B, GSC866-1180 Description:STAR,DA Position:RA=12H 05M 12.537S +/-0.1S, ! Most common specification format is DEC=+08D 43' 58.58" +/-0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=-30 RA_PM:-0.015 ! Units are seconds of time per year Dec_PM:+0.05 ! Units are seconds of arc per year Epoch:J2000 Annual_Parallax:0.01" Flux:V=16.1 +/-3, B-V=-0.00+/-0.15 Comments:We want to observe the WD companion to the G8III star, which has V=4.13 and B-V=0.97. The white dwarf companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:2 Target_Name:HD133208-B Alternate_Names:beta_Boo-B, GSC3047-1258 Description:STAR, DA Position:RA=15H 01M 56.757S +/-0.1S, DEC=+40D 23' 26.10" +/-0.1", ! PLATE-ID= Equinox:J2000 RV_or_Z:V=-20 RA_PM:-0.004 Dec_PM:-0.03 Epoch:J2000 Annual_Parallax:0.02 Flux:V=14.5 +/-3, B-V=-0.00+/-0.15 Comments:We want to observe the white dwarf companion to the G8III star, which has V=3.5, B-V=0.97. The WD companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:3 Target_Name:HD215665-B Alternate_Names:lambda_Peg-B, GSC2221-1666 Description:Star,DA Position:RA=22H 46M 31.883S +/-0.1S, DEC=+23D 33' 56.35" +/-0.1", ! PLATE-ID= Equinox:J2000 RV_or_Z:V=-4 RA_PM:0.004 Dec_PM:-0.01 Epoch:J2000 Annual_Parallax:0.01 Flux:V=15.0 +/-3, B-V=-0.00 +/-0.15 Comments:We want to observe the white dwarf companion to the G8III star, which has V=3.95, B-V=1.07. The WD companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:4 Target_Name:HD65699-B Alternate_Names:12_Pup, GSC6554-3065 Description:STAR,DA Position:RA=7H 59M 05.731S +/-0.1S, DEC=-23D 18' 37.65" +/-0.1", ! PLATE-ID= Equinox:J2000 RV_or_Z:V=+11 RA_PM:+0.000 Dec_PM:+0.001 Epoch:2000 Annual_Parallax:0.001 Flux:V=16.1+/-3, B-V=-0.00 +/-0.15 Comments:We want to observe the white dwarf companion to the K2III star,which has V=5.1, B-V=1.12. The WD companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:5 Target_Name:HD16458-B Alternate_Names:GSC4520-1238 Description:STAR,DA Position:RA=02H 47M 47.645S +/-0.1S, DEC=+81D 26' 54.45" +/-0.1", ! PLATE-ID= Equinox:J2000 RV_or_Z:V=+18 RA_PM:+0.005 Dec_PM:-0.08 Epoch:J2000 Annual_Parallax:0.01 Flux:V=16.8+/-3, B-V=-0.00+/-0.15 Comments:We want to observe the whitw dwarf companions to the K1III star, which has V=5.76, B-V=1.30. The WD companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:6 Target_Name:HD116713-B Alternate_Names:GSC7791-2183 Description:STAR,DA Position:RA=13H 26M 07.775S +/-0.1S, DEC=-39D 45' 18.53" +/-0.1", ! PLATE-ID= Equinox:J2000 RV_or_Z:V=+67 RA_PM:+0.016 Dec_PM:-0.05 Epoch:J2000 Annual_Parallax:0.01 Flux:V=16.1+/-3, B-V=-0.00+/-0.15 Comments:We want to observe the white dwarf companion to the K0.5III star,which has V=5.09, B-V=1.20. The WD companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:7 Target_Name:HD101013-B Alternate_Names:GSC3454-2188 Description:STAR,DA Position:RA=11H 37M 53.013S +/-0.1S, DEC=+50D 37' 05.65" +/-0.1", ! PLATE-ID= Equinox:J2000 RV_or_Z:V=-4 RA_PM:-0.005 Dec_PM:-0.02 Epoch:J2000 Annual_Parallax:0.01 Flux:V=17.2+/-3, B-V=-0.0+/-0.15 Comments:We want to observe the white dwarf companion to the K0III star,which has V=6.15, B-V=1.07. The WD has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:8 Target_Name:HD46407-B Alternate_Names:HR2392-B, GSC5369-0220 Description:STAR,DA Position:RA=6H 32M 46.889S +/- 0.1S, ! Most common specification format is DEC=-11D 09' 59.14" +/- 0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=-11 RA_PM:-0.001 ! Units are seconds of time per year Dec_PM:+0.00 ! Units are seconds of arc per year Epoch:J2000 Annual_Parallax:0.01" Flux:V=18.2 +/-3, B-V=-0.00+/-0.15 Comments:We want to observe the WD companion to the K0III star, which has V=6.24 and B-V=1.11 The white dwarf companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:9 Target_Name:HD89948-B Alternate_Names:GSC6631-0715 Description:STAR,DA Position:RA=10H 22M 21.883S +/-0.05S, ! Most common specification format is DEC=-29D 33' 21.14" +/-0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=0 RA_PM:-0.001 ! Units are seconds of time per year Dec_PM:+0.08 ! Units are seconds of arc per year Epoch:J2000 Annual_Parallax:0.005" Flux:V=17.7 +/-3, B-V=-0.00+/-0.15 Comments:We want to observe the WD companion to the G8III star, which has V=7.7 and B-V=0.91. The white dwarf companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:10 Target_Name:HD165634-B Alternate_Names:HR6766-B, GSC6854-4372 Description:STAR,DA Position:RA=18H 08M 04.992S +/-0.1S, ! Most common specification format is DEC=-28D 27' 25.50" +/-0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=-4 RA_PM:+0.002 ! Units are seconds of time per year Dec_PM:-0.03 ! Units are seconds of arc per year Epoch:J2000 Annual_Parallax:0.01" Flux:V=14.6 +/-3, B-V=-0.00+/-0.15 Comments:We want to observe the WD companion to the G8III star, which has V=4.57 and B-V=0.94. The white dwarf companion has not yet been seen. (Coordinates are from Hipparcos Input Catalog.) Target_Number:11 Target_Name:HD40808-CALIB Alternate_Names:ETA_COL, GSC7606-0989 Description:STAR Position:RA=5H 59M 08.806S +/-0.05S, ! Most common specification format is DEC=-42D 48' 54.83" +/-0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=+17 RA_PM:+0.002 ! Units are seconds of time per year Dec_PM:-0.01 ! Units are seconds of arc per year Epoch:2000 Annual_Parallax:0.01" Flux:V=3.96 +/-0.1, B-V=1.14+/-0.02 Comments: (Coordinates are from Hipparcos Input Catalog.) Target_Number:12 Target_Name:HD163993-CALIB Alternate_Names:HR6703, GSC2102-2772 Description:STAR, Position:RA=17H 57M 45.895S +/-0.05S, ! Most common specification format is DEC=+29D 14' 52.46" +/-0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=-1 RA_PM:+0.006 ! Units are seconds of time per year Dec_PM:-0.02 ! Units are seconds of arc per year Epoch:J2000 Annual_Parallax:0.02" Flux:V=3.70 +/-0.1, B-V=0.94+/-0.02 Comments: (Coordinates are from Hipparcos Input Catalog.) Target_Number:13 Target_Name:HD157347-CALIB Alternate_Names:HR6465, GSC5071-0891 Description:STAR, Position:RA=17H 22M 51.31S +/-0.1S, ! Most common specification format is DEC=-2D 23' 17.53" +/-0.1", ! RA=0H 0M 0.00S +/- 0S, ! PLATE-ID= ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox:J2000 RV_or_Z:V=-34 RA_PM:+0.004 ! Units are seconds of time per year Dec_PM:-0.11 ! Units are seconds of arc per year Epoch:2000 Annual_Parallax:0.01" Flux:V=6.29 +/-0.1, B-V=0.68+/-0.02 Comments: (Coordinates are from Hipparcos Input Catalog.) ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling ! PCS MODE [Fine | Gyro] ! GUIDing TOLerance ! DROP TO GYRO IF NECESSARY [NO REACQuisition] ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! SCHEDulability ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN