! Proposal 5885, submission 2 ! PI: Alain Lecavelier Des Etangs ! Received Wed Mar 15 11:21:38 EST 1995 ! From: lecaveli@iap.fr ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5885,v 4.1 1995/09/22 15:28:55 pepsa Exp $ ! 7 phase2p@stsci.edu Fri Mar 17 02:01 739/26368 Proposal 5891, submission ! 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: Alice Berman ! Phone: 410 338-4462 , E-mail: aberman@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Proposal_Information ! Section 4 Title: GHRS-Observations of candidate Beta Pictoris-like circumstellar gaseous disk Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: Alain Lecavelier Des Etangs PI_Institution: Institut d'Astrophysique de Paris CoI_Name: A. Vidal-Madjar CoI_Institution: Institut d'Astrophysique de Paris Contact: ! Y or N (designate at most one contact) CoI_Name: R. Ferlet CoI_Institution: Institut d'Astrophysique de Paris Contact: ! Y or N (designate at most one contact) CoI_Name: A. Lagrange-Henri CoI_Institution: Observatoire de Grenoble Contact: ! Y or N (designate at most one contact) CoI_Name: H. Beust CoI_Institution: Observatoire de Grenoble Contact: ! Y or N (designate at most one contact) CoI_Name: D. Mouillet CoI_Institution: Observatoire de Grenoble Contact: ! Y or N (designate at most one contact) CoI_Name: M. Deleuil CoI_Institution: Laboratoire d'Astrophysique de Marseille Contact: ! Y or N (designate at most one contact) CoI_Name: J Lissauer CoI_Institution: State University of New-York Contact: ! Y or N (designate at most one contact) CoI_Name: D Backman CoI_Institution: NASA Ames Research Center Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) The gaseous parts of dust disks surrounding main sequence stars have been the subject of intense investigations since 1985. The spectral signatures of Beta Pictoris led to the explanation that the gas content whose origin was a puzzle in such an evolved disk is produced by the evaporation of many small bodies. A way to progress in that field is to search for gas signatures in the environment of other stars presenting known IR excesses or shell characteristics. This study was started from the ground and should be continued now in the UV where stronger lines are available. From ground- based observations, we have shown that four stars present weak circumstellar gas signatures (Lagrange-Henri et al 1990). More recently, two additionnal candidates were discovered in an optical survey of the local interstellar medium. But from the ground, it is clear that having access to essentially only the CaII lines is a strong limitation. The UV observation of these lines of sight will give us a detailed view of the circumstellar material. The inconsistent conclusions about possible gas absorption towards Alpha PsA with IUE and GHRS show the limitation of IUE Studies. Here we propose GHRS observations of four of these stars in order to confirm the existence of the circumstellar gas, to improve our knowledge of such gaseous disk, and to understand the origin of this gas at somewhat later stages of the stellar evolution. Questions ! Free format text (please update) Observing_Description: To detect the gaseous atmosphere of the disk and to have a view of the physical state of the circumstellar material around the selected stars, we propose to look at the following very strong UV lines with LSA and ECH-B: Fe II fine structure (385 cm-1) 2598.4A. and (667 cm-1) 2607A., in the same domain the Mn II multiplet at 2600A. The Mg II doublet 2802.7A and 2795.5A. The presence of gas absorption from Fe II excited levels is a strong signature of the circumstellar origin while absorptions from excited fine-structure levels require densities incompatible with those find in the interstellar medium., The following table presents the flux (10E-11erg.s-1.cm-2A.-1), the exposure time (t_e) and S/N at the bottom of the lines. star (HR) 10 2174 6519 8675, ------------------------------------------------------ Flux at 2600A. 0.10 0.24 1.1 1.8 Flux at 2800A. 0.09 0.20 0.7 1.5 S/N 20 30 40 50 t_e (s) at 2600A. 326.4 326.4 108.8 108.8 t_e (s) at 2800A. 389 391 202 108.8 In addition and for only the two best candidates (HR 8675 and HR 6519: 51 Oph), we propose to observe with G160M the 1550A. region to search for CO, C I and C IV signatures. star Lambda S/N t_e --------------------------------------------------- HR 6519 GM160 1550 A 40 108.8 HR 8675 GM160 1550 A 50 407 These observations will allow to compare the velocity field of different species. Indeed, these stars have already shown redshift variable absorption features (Lagrange-Henri et al. 1990b and Grady et al. 1993), and from our Beta Pic analysis, we have shown that there are strong differences between the ionised species like C IV or Al III which show very large redshift and are probably associated with comets-size bodies (Beust et al 1991, Beust and Tagger 1993), and the other species like C I which are mainly at rest. Real_Time_Justification: None None. Calibration_Justification: Additional_Comments: ! Hipparcos coordinates added 4/12/95 - AFB Fixed_Targets Target_Number:1 Target_Name:HD256 Alternate_Names:HR10,GSC05838-01289 Description:STAR, DISK Position:RA=00H 07M 18.27S +/- 0.01S, DEC=-17D 23' 13.1" +/- 0.1" Equinox:J2000 RV_or_Z:V=0 ! RA_PM:-0.0008 ! Dec_PM:0.017 ! Epoch:J2000 Flux:V=6.2, TYPE=A6V, B-V=0.14, F-CONT(2600)=0.42E-11, F-CONT(2800)=0.53E-11 Comments:Coordinates from Hipparcos INCA 4/12/95 Target_Number:2 Target_Name:HD42111 Alternate_Names:HR2174,GSC00135-01616 Description:STAR, DISK Position:RA=06H 08M 57.88S +/- 0.01S, DEC=02D 29' 58.9" +/- 0.1" Equinox:J2000 RV_or_Z:V=+34 ! RA_PM:0.000 ! Dec_PM:-0.0122 ! Epoch:J2000 Flux:V=5.7, TYPE=A3V, B-V=0.07, F-CONT(2600)=0.95E-11, F-CONT(2800)=1.2E-11 Comments:Coordinates from Hipparcos INCA 4/12/95 Target_Number:3 Target_Name:HD158643 Alternate_Names:HR6519,GSC06826-00368 Description:STAR, DISK Position:RA=17H 31M 24.96S +/- 0.01S, DEC=-23D 57' 45.7" +/- 0.1" Equinox:J2000 RV_or_Z:V=-12 ! RA_PM:0.0003 ! Dec_PM:-0.026 ! Epoch:J2000 Annual_Parallax:0.04 Flux:V=4.8, TYPE=B9.5V, B-V=0.00, F-CONT(2600)=4.3E-11, F-CONT(2800)=4.3E-11 Comments:Coordinates from Hipparcos INCA 4/12/95 Target_Number:4 Target_Name:HD215789 Alternate_Names:HR8675,GSC08453-01499 Description:STAR, DISK Position:RA=22H 48M 33.30S +/- 0.01S, DEC=-51D 19' 0.6" +/- 0.1" Equinox:J2000 RV_or_Z:V=-3 ! RA_PM:0.011 ! Dec_PM:-0.071 ! Epoch:J2000 Annual_Parallax:0.044 Flux:V=3.49, TYPE=A3V, B-V=0.08, F-CONT(2600)=7.1E-11, F-CONT(2800)=9.0E-11 Comments:Coordinates from Hipparcos INCA 4/12/95 !====================================================================== !====================================================================== Visits Visit_Number:1 Visit_Requirements: Visit_Comments: Exposure_Number:10 Target_Name:HD256 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters:BRIGHT=RETURN LOCATE=DEF SEARCH-SIZE=3 Number_of_Iterations:1 Time_Per_Exposure:1.8S Special_Requirements:ONBOARD ACQ FOR 20 Comments:STEP-TIME=0.2 => Count=1.8e5 Exposure_Number:20 Target_Name:HD256 Config:HRS Opmode:ACQ/PEAKUP Aperture:0.25 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:5S Special_Requirements:ONBOARD ACQ FOR 32-42 Comments:STEP-TIME=0.2 => Count=1.2e5 ! Exposure_Number:31 ! Target_Name:WAVE ! Config:HRS ! Opmode:ACCUM ! Aperture:SC2 ! Sp_Element:ECH-B ! Wavelength:2603.5 ! Optional_Parameters: !Number_of_Iterations:1 ! Time_Per_Exposure:DEF !Special_Requirements:SEQ 31-32 NON-INT Exposure_Number:32 Target_Name:HD256 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2603.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:326.4S Special_Requirements: Comments: Exposure_Number:42 Target_Name:HD256 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2800.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:389S Special_Requirements: Comments: !======================================================== Visit_Number:2 Visit_Requirements: Visit_Comments: Exposure_Number:10 Target_Name:HD42111 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters:BRIGHT=RETURN LOCATE=DEF SEARCH-SIZE=3 Number_of_Iterations:1 Time_Per_Exposure:1.8S Special_Requirements:ONBOARD ACQ FOR 20 Comments:STEP-TIME=0.2 => Count=3.4e5 Exposure_Number:20 Target_Name:HD42111 Config:HRS Opmode:ACQ/PEAKUP Aperture:0.25 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:5S Special_Requirements:ONBOARD ACQ FOR 32-42 Comments:STEP-TIME=0.2 => Count=2.2e5 Exposure_Number:32 Target_Name:HD42111 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2603.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:326.4S Special_Requirements: Comments: Exposure_Number:42 Target_Name:HD42111 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2800.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:391S Special_Requirements: Comments: !======================================================== Visit_Number:3 Visit_Requirements: Visit_Comments: Exposure_Number:10 Target_Name:HD158643 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters:BRIGHT=RETURN LOCATE=DEF SEARCH-SIZE=3 Number_of_Iterations:1 Time_Per_Exposure:1.8S Special_Requirements:ONBOARD ACQ FOR 20 Comments:STEP-TIME=0.2 => Count=1.2e6 Exposure_Number:20 Target_Name:HD158643 Config:HRS Opmode:ACQ/PEAKUP Aperture:0.25 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:5S Special_Requirements:ONBOARD ACQ FOR 32-52 Comments:STEP-TIME=0.2 => Count=8.0e5 Exposure_Number:32 Target_Name:HD158643 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2603.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:108.8S Special_Requirements: Comments: Exposure_Number:42 Target_Name:HD158643 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2800.5 Optional_Parameters:FP-SPLIT=TWO STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:252S Special_Requirements: Comments:The time is computed in order to use the target visibility as much as possible and must be expanded to 5x54.4s= 272s if possible. Exposure_Number:52 Target_Name:HD158643 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:G160M Wavelength:1550 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:108.8S Special_Requirements: Comments: !======================================================== Visit_Number:4 Visit_Requirements: Visit_Comments: Exposure_Number:10 Target_Name:HD215789 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters:BRIGHT=RETURN LOCATE=DEF SEARCH-SIZE=3 Number_of_Iterations:1 Time_Per_Exposure:1.8S Special_Requirements:ONBOARD ACQ FOR 20 Comments:STEP-TIME=0.2 => Count=2.5e6 Exposure_Number:20 Target_Name:HD215789 Config:HRS Opmode:ACQ/PEAKUP Aperture:0.25 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:5S Special_Requirements:ONBOARD ACQ FOR 32-52 Comments:STEP-TIME=0.2 => Count=1.6e6 Exposure_Number:32 Target_Name:HD215789 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2603.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:108.8S Special_Requirements: Comments: Exposure_Number:42 Target_Name:HD215789 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2800.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:108.8S Special_Requirements: Comments: Exposure_Number:52 Target_Name:HD215789 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:G160M Wavelength:1550 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:407S Special_Requirements: Comments:The time is computed in order to use the target visibility as much as possible and must be expanded to 4x108.8s= 435.2s if possible. Visit_Number:5 Visit_Requirements: Visit_Comments: Exposure_Number:10 Target_Name:HD158643 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters:BRIGHT=RETURN LOCATE=DEF SEARCH-SIZE=3 Number_of_Iterations:1 Time_Per_Exposure:1.8S Special_Requirements:ONBOARD ACQ FOR 20 Comments:STEP-TIME=0.2 => Count=1.2e6 Exposure_Number:20 Target_Name:HD158643 Config:HRS Opmode:ACQ/PEAKUP Aperture:0.25 Sp_Element:MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:5S Special_Requirements:ONBOARD ACQ FOR 32-52 Comments:STEP-TIME=0.2 => Count=8.0e5 Exposure_Number:32 Target_Name:HD158643 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2603.5 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:108.8S Special_Requirements: Comments: Exposure_Number:42 Target_Name:HD158643 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:ECH-B Wavelength:2800.5 Optional_Parameters:FP-SPLIT=TWO STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:252S Special_Requirements: Comments:The time is computed in order to use the target visibility as much as possible and must be expanded to 5x54.4s= 272s if possible. Exposure_Number:52 Target_Name:HD158643 Config:HRS Opmode:ACCUM Aperture:0.25 Sp_Element:G160M Wavelength:1550 Optional_Parameters:FP-SPLIT=STD STEP-PATT=DEF Number_of_Iterations:1 Time_Per_Exposure:108.8S Special_Requirements: 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 ! PI Address from Phase I is: ! ! IAP ! 98 Bis Bld Arago ! F-75014 PARIS FRANCE ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address !