! 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 <free-text>
! 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
! <free-text>