! Proposal 5876, submission 1 ! PI: K.-P. Cheng ! Received Tue Feb 28 16:09:09 EST 1995 ! From: aberman@stsci.edu ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5876,v 8.1 1995/08/15 12:51:28 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: 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: A GHRS Study of Circumstellar Gas Around Proto-Planetary System Candidates Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: K.-P. Cheng PI_Institution: California State University, Fullerton CoI_Name: Fred Bruhweiler CoI_Institution: Catholic University of America Contact: N ! Y or N (designate at most one contact) CoI_Name: James Neff CoI_Institution: Pennsylvania State University Contact: N ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose to study the circumstellar (CS) gas around stars that are similar to Beta Pictoris, the well-known proto- planetary system candidate. This is the final stage of our multiwavelength (IR+Optical+UV) search for possible planetary systems in our sample of the 62 A stars within 25 pc. Since the evolutionary lifetimes of main-sequence A stars roughly correspond to the era of planet formation and subsequent ``heavy bombardment" in our solar system, it is likely that Beta Pic's dust+gas disk is similar to the accretion disk in the primordial solar nebula that led the formation of the Kuiper Belt. Based on our ground-based Ca II and IUE Fe II spectra of the complete volume-limited sample of A stars, we have identified at least 12 stars with possible CS gas. We plan to use the high-resolution and high-S/N capabilities of GHRS to probe the physical conditions in the CS gas. We will use atomic transitions arising from ground and low-lying metastable states to (a) verify our optical and UV CS gas detections, (b) derive accurate CS gas column densities, (c) constrain the absorbing CS gas number density and temperature, and (d) search for and characterize dynamic spectral activity similar to the mass flows seen in Beta Pic. Finally, we will combine our CS gas study with our previous IRAS CS dust survey to probe the link between stars with CS gas and those with dust disks. Our ultimate goal is to ascertain if these stars, as a group, represent some phase of planet formation. Questions ! Free format text (please update) Observing_Description: We propose to obtain high-resolution (Echelle-B) and medium- resolution (G200M) GHRS spectra of HD 217782, a possible proto-planetary system candidate we identified from our volume-limited A stars survey. All exposures will be through the LSA in the ``FP-Split" mode. We will obtain Ech-B spectra of Fe II lines centered at 2598 A (m=22) and 2607/2611 A (m=22). We will also obtain an Al III spectum centered at 1860 A with G200M. All the proposed GHRS exposure times were calculated based on our IUE data. Since accurate registration of our spectra in terms of heliocentric radial velocities is essential to the correct interpretation of mass flows, we will obtain one wavelength calibration spectrum for each grating setting. Real_Time_Justification: None, all the supporting observations for this proposed project have been completed. Calibration_Justification: None ! Move appropriate text from Real_Time_Justification Additional_Comments: ! Target coordinates updated 6/5/95 from HIC - ABerman ! Proper Motion from HIC added 6/23/95 - ABerman Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: HD217782 Alternate_Names: 2AND, GSC3224-03432 Description: STAR, A0-A3 V-IV Position: RA = 23H 02M 36.32S +/- 0.01S, DEC = 42D 45' 28.8" +/- 0.1" Equinox: J2000 RV_or_Z: RA_PM: 0.0043 Dec_PM: 0.002 Epoch: 2000.000 Annual_Parallax: 0.034 Flux: V=5.09,B-V=0.09 ! Include at least V and B-V Comments: Coordinates are from Hipparcos INCA ! Original values: ! Position: RA=23H 0M 17.85S +/- 0.01S, ! DEC=42D 29' 18.9" +/- 0.01", ! Equinox: 1950 ! Epoch: 1950 ! Flux: V=5.10 ! RA_PM: 0.0048 ! Dec_PM: 0.0000 ! 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 On_Hold_Comments: Visit_Comments: Exposure_Number: 1 ! Section 6.5 Target_Name: HD217782 Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N2 Wavelength: Optional_Parameters: BRIGHT=RETURN Number_of_Iterations: 1 Time_Per_Exposure: 1.8s Special_Requirements: ONBOARD ACQuisition FOR 2-5 Comments: STEP-TIME=0.2S Exposure_Number: 2 ! Section 6.5 Target_Name: HD217782 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-B Wavelength: 2598 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 435.2S Special_Requirements: SEQuence 2-5 NON-INTerruptible Comments: Exposure_Number: 3 ! Section 6.5 Target_Name: WAVE Config: HRS Opmode: ACCUM Aperture: SC2 Sp_Element: ECH-B Wavelength: 2609 Optional_Parameters: STEP-PATT=3 Number_of_Iterations: 1 Time_Per_Exposure: 30.0S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 4 ! Section 6.5 Target_Name: HD217782 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-B Wavelength: 2609 Optional_Parameters: FP-SPLIT=STD,SPYBAL=NO Number_of_Iterations: 1 Time_Per_Exposure: 435.2S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 5 ! Section 6.5 Target_Name: HD217782 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G200M Wavelength: 1860 Optional_Parameters: STEP-PATT=DEF Number_of_Iterations: 1 ! Time_Per_Exposure: 316.0S Time_Per_Exposure: 598.4S ! Time changed 6/23/95 - AFB 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: Fred Bruhweiler c/o the GHRS Team Goddard Space Flight Center Ship_Via: Pickup by Jennifer Sandoval ! UPS (2-day) or OVERNIGHT Recipient_Email: hrsfred@hrs.gsfc.nasa.gov ! Needed if Ship_To: is not PI_Address ! 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