! Proposal 5880, submission 3 ! PI: George H. Herbig ! Received Mon Mar 6 13:20:21 EST 1995 ! From: aberman@stsci.edu ! Proposal 5880, submission 2 ! PI: George H. Herbig ! Received Fri Mar 3 16:18:11 EST 1995 ! From: aberman@stsci.edu ! Proposal 5880, submission 1 ! PI: George H. Herbig ! Received Tue Feb 28 16:20:02 EST 1995 ! From: simon@galileo.IFA.Hawaii.Edu ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5880,v 6.1 1995/06/28 12:19:47 pepsa Exp $ ! AFB changed exposure time on Visit 3 ACQ from 1.8S to 9.0S 3/3/95 ! ! 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: OH as a Signpost of Accretion in T Tauri Stars Proposal_Category: GO Scientific_Category: Cool Stars Cycle: 5 Investigators PI_name: George H. Herbig PI_Institution: Institute for Astronomy, University of Hawaii CoI_Name: Theodore Simon CoI_Institution: Institute for Astronomy, University of Hawaii Contact: Y ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) The H_2O in the interstellar material moving inward in the accretion disk around a T Tauri star, if it is similar to the material in cometary nuclei, will be dissociated by the ultraviolet radiation of the star. A major product is OH, which is detectable in emission by resonance scattering of the 0--0 band near 3100 Angstrom. We propose to examine T Tau and RU Lup for this phenomenon. Questions ! Free format text (please update) Observing_Description: We propose to obtain one GHRS spectrum each of T Tauri and RU Lupi, using the G270M grating + D2 detector and the large science aperture. The spectra will cover the 3064--3108 Angstrom\ region, centered on the 0--0 band of OH. Adopting fluxes measured from low dispersion IUE spectra, we estimate that for T Tau a 73-minute integration spanning two orbits of HST will yield a S/N of 17:1 for a single diode. Similarly, a 75-minute integration on RU Lup (also over two orbits) will yield a S/N ratio of 21:1. For T Tau we adopt a flux of 5 * 10^-14 erg cm^-2 s^-1 ang^-1, which yields an expected count rate of 0.075 cts s^-1. For RU Lup the flux is 7 * 10^ -14 erg cm^-2 s^-1 ang^-1, giving a count rate of 0.10 cts s^ -1. If required, a 2-pixel sliding mean can be applied to the data to improve the S/N ratio to 24:1 and 29:1, respectively, at the expense of a lower, smoothed spectral resolution of 0.18 Angstrom. A short observation will also be made of a spectral standard, Eta Cephei. From an IUE flux of 1.5 * 10^-11 erg cm^-2 s^-1 ang^-1 we deduce a GHRS count rate of 22 cts diode^-1 s^-1 and a S/N > 50:1 across the entire 3064- -3108 Angstrom\ region in a 5 minute exposure. Real_Time_Justification: None. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 ! Target coordinates updated 5/4/95 - AFB Target_Number: 1 Target_Name: HD284419 Alternate_Names: T-TAURI, GSC1272-00470 Description: STAR, T TAURI STAR Position: RA = 04H 21M 59.42S +/- 0.01S, DEC = 19D 32' 6.4" +/- 0.2", PLATE-ID = 000P Equinox: J2000 RV_or_Z: V = +19.1 ! RA_PM: 0.0008 ! Units are seconds of time per year ! Dec_PM: -0.012 ! Units are seconds of arc per year Epoch: 1982.962 Annual_Parallax: 0.007 Flux: V = 9.08 +/- 0.40 ! Include at least V and B-V B-V = 1.19 +/- 0.2, F-CONT(3100) = 5 +/- 3 E-14 Comments: Coordinates are from GSC ! Original values: ! Position: ! J2000 FROM PPM 119824 ! RA = 04H 21M 59.40S +/- 1", ! RA=0H 0M 0.00S +/- 0S, ! DEC=+19D 32' 06.5" +/- 1" ! DEC=0D 0' 0.0" +/- 0", ! ! PLATE-ID=0000 ! Equinox: 2000 ! Epoch: 2000.0 ! Flux: V = 9.9 +/- 0.4, ! Target_Number: 2 Target_Name: HD142560 Alternate_Names: RU-LUPI, GSC7838-00546 Description: STAR, T TAURI STAR Position: RA = 15H 56M 42.26S +/- 0.04S, DEC = -37D 49' 15.7" +/- 0.5", PLATE-ID = 02F8 Equinox: J2000 RV_or_Z: V = -6.4 ! RA_PM: Not available ! Units are seconds of time per year ! Dec_PM: Not available ! Units are seconds of arc per year Epoch: 1975.423 Annual_Parallax: 0.008 Flux: V = 11.27 +/- 0.41 ! Include at least V and B-V B-V = 0.48 +/- 0.2, F-CONT(3100) = 7 +/- 3 E-14 Comments: Coordinates are from GSC ! Original values: ! Position: ! J2000 FROM HIC 78094 ! RA = 15H 56M 42.29S +/- 1", ! RA=0H 0M 0.00S +/- 0S, ! DEC=-37D 49' 16.1" +/- 1" ! DEC=0D 0' 0.0" +/- 0", ! ! PLATE-ID=0000 ! Equinox: 2000 ! Epoch: 2000.0 ! Flux: V = 10.5 +/- 0.4, Target_Number: 3 Target_Name: HD198149 Alternate_Names: ETA-CEPHEI, GSC4246-01967 Description: STAR, K V-IV Position: RA = 20H 45M 17.24S +/- 0.01S, DEC = 61D 50' 20.3" +/- 0.1" Equinox: J2000 RV_or_Z: V = -87.3 RA_PM: 0.0123 ! Units are seconds of time per year Dec_PM: +0.818 ! Units are seconds of arc per year Epoch: 2000.000 Annual_Parallax: 0.071 Flux: V = 3.40 ! Include at least V and B-V B-V = 0.92 +/- 0.02, F-CONT(3100) = 1.6 +/- .2 E-11 Comments: Coordinates are from Hipparcos INCA ! Original values: ! Position: ! J2000 FROM PPM 22372 ! RA = 20H 45M 17.38S +/- .1", ! RA=0H 0M 0.00S +/- 0S, ! DEC=+61D 50' 19.6" +/- .1" ! DEC=0D 0' 0.0" +/- 0", ! ! PLATE-ID=0000 ! Equinox: 2000 ! Epoch: 2000.0 ! Flux: V = 3.43 +/- 0.02, ! 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 ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN