! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 6085,v 11.1 1995/11/22 19:45:50 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: Dustin Manning ! Phone: 410 338-4456 , E-mail: manning@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Date generated: Sun Dec 18 19:22:52 EST 1994 ! Proposal_Information ! Section 4 Title: The Nature of the AM Canum Venaticorum Variables, The Cataclysmic-DB White Dwarf Connection? Proposal_Category: GO Scientific_Category: Hot Stars Cycle: 5 Investigators PI_name: Dr. Edward Sion PI_Institution: Villanova University CoI_Name: Dr. John Cannizzo CoI_Institution: NASA GSFC Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Darragh O'Donoghue CoI_Institution: University of Cape Town Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Min Huang CoI_Institution: Villanova University Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. James Liebert CoI_Institution: University of Arizona Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Tom Marsh CoI_Institution: University of Southampton Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Judith Provencal CoI_Institution: University of Delaware Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Harry Shipman CoI_Institution: University of Delaware Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Jan-Erik Solheim CoI_Institution: University of Tromso Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Gerard Vauclair CoI_Institution: Observatoire Midi-Pyrenees Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Klaus Werner CoI_Institution: Universitat Der Kiel Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) The fundamental nature of the AM Canum Venaticorum (AM CVn) objects remains a mystery. Unlike their helium purity in the optical, far UV spectra of AM CVn objects reveal a broad mix of metal absorption features and He II (1640). We propose two GHRS observations of AM CVn to gain fundamental insight: (1) a single GHRS G140L exposure in RAPID mode with a spectrum every 20 seconds (over 2.5 cycles of the 1120s period= 46 minutes) delivering the first rapid time-resolved monitoring of the far UV line profiles and continuum levels over the range of the putative rotational/orbital periods (175s~1100s) reported for the systems and; (2) a single deep exposure with GHRS G160M in ACCUM mode to secure and model the first fully-resolved line profile for the complex He II (1640) region and detect circumbinary/circumstellar features. Are they really helium- transferring binary white dwarfs or single (merged?) rotating degenerates? Do they manifest wind outflow in the far UV? Are they related to the helium-rich DO/DB degenerates? Are they surrounded by circumstellar/circumbinary shells? What is the rotation rate of the underlying hot degenerate? A single very noisy, 15 hour IUE HIRES image of AM CVn (Solheim and Sion 1994, A&A (Letters), in press) revealed evidence for a hot circumbinary/circumstellar shell and a strong, complex asymmetric He II (1640) profile with broad emission reversal, remarkably similar to the He II (1640) profile structure of the "cool" DO star HZ21. Questions ! Free format text (please update) Observing_Description: First, we will use the GHRS with the G140L grating in RAPID operating mode to obtain a spectrum every 20 seconds for a total exposure time of 2750 seconds, covering 2.5 cycles on the photometric period of 1100s. All of the above scientific objectives are achievable with two observations using GHRS. The first will use G140L in RAPID mode covering the region (1365-1651Angstrom) to obtain spectra every 20 seconds, probing for ultraviolet continuum and line strength variations around the putative orbital or rotational cycles, time-resolved on the range of reported periods (175s to 1100s). Our target visibility of 53 minutes and G140L RAPID observation will give us 42 minutes of uninterrupted RAPID mode spectra during the second orbit following setup/acquisition in the first orbit and a G160M bonus spectrum of the NV region (1227-1262 Angstrom) to fill in 19 minutes of free time before earth occultation. The second ``deep" observation will use GHRS and the G160M disperser in ACCUM mode to cover the He II (1640) region, resolve the complex profile structure model it and bring out any cirumstellar/circumbinary features stationary with respect to the putative rotational/orbital periods. Our observations will provide the first fully resolved far UV line profile for these systems and reveal line profile variations around the putative orbital or rotational period of AM CVn. GHRS G140L Observation: For AM CVn, F-CONT(1300) = (4+/- 1)* 10^-13; We will utilize GHRS side 1, G140L (1365-1651Angstrom) in RAPID operating mode, 1.68 cts/sec/diode; require 2.2 min to reach S/N = 15; will obtain a spectrum every 20 seconds. GHRS G160M Observation: For AM CVn,F-CONT(1300) = (4+/- 1)* 10^-13; We will utilize side 2 of GHRS, G160M, LSA (1615-1650Angstrom), require 44 minute exposure to reach S/N = 15/diode, =60/Angstrom resolution = 0.07 Angstrom/diode. We will use the Accumulation mode. we will split exposures to obtain a spectrum every 5 minutes Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: AM-CVN Alternate_Names: HZ29 Description: STAR, WDO, NOVA-LIKE, INTERACTING BINARY Position: RA=12H 34M 54.58S +/- 0.1S,! Most common specification DEC=+37D 37' 43.4" +/- 0.3",! format is PLATE-ID=01PQ ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", Equinox: J2000 RV_or_Z: RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V=14.0, B-V=-0.1, F-CONT(1300) = 4 +/- 1 E-13 Comments: ! 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: AM-CVN Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N2 Wavelength: Optional_Parameters: BRIGHT=RETURN, SEARCH-SIZE=5 Number_of_Iterations: 1 Time_Per_Exposure: 25S Special_Requirements: ONBOARD ACQ FOR 2-6 ! Section 7.2 Exposure_Number: 2 ! Section 6.5 Target_Name: AM-CVN Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G160M Wavelength: 1632 Optional_Parameters: STEP-PATT=5 Number_of_Iterations: 15 Time_Per_Exposure: 57.6S Special_Requirements: ! Section 7.2 Exposure_Number: 3 ! Section 6.5 Target_Name: AM-CVN Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G160M Wavelength: 1245 Optional_Parameters: STEP-PATT=5 Number_of_Iterations: 20 Time_Per_Exposure: 57.6S Special_Requirements: ! Section 7.2 Exposure_Number: 4 ! Section 6.5 Target_Name: AM-CVN Config: HRS Opmode: RAPID Aperture: 2.0 Sp_Element: G140L Wavelength: 1401.5 Optional_Parameters: SAMPLE-TIME=1 Number_of_Iterations: 15 Time_Per_Exposure: 20S ! Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 5 ! Section 6.5 Target_Name: AM-CVN Config: HRS Opmode: RAPID Aperture: 2.0 Sp_Element: G140L Wavelength: 1401.5 Optional_Parameters: SAMPLE-TIME=1 Number_of_Iterations: 15 Time_Per_Exposure: 20S ! Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 6 ! Section 6.5 Target_Name: AM-CVN Config: HRS Opmode: RAPID Aperture: 2.0 Sp_Element: G140L Wavelength: 1401.5 Optional_Parameters: SAMPLE-TIME=1 Number_of_Iterations: 15 Time_Per_Exposure: 20S ! Special_Requirements: ! Section 7.2 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 ! ! ! ! ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address ! ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator