Proposal_Information ! Section 4 Title: A Spectrum of the Bright, Mysterious White Dwarf Star Procyon B Proposal_Category: GO Scientific_Category: Cool Stars Cycle: 5 Investigators PI_name: Harry Shipman PI_Institution: University of Delaware CoI_Name: Dr. Judi Provencal CoI_Institution: University of Delaware Contact: ! Y or N (designate at most one contact) CoI_Name: Howard Bond CoI_Institution: Space Telescope Science Institute Contact: ! Y or N (designate at most one contact) CoI_Name: Edward Sion CoI_Institution: Villanova University Contact: ! Y or N (designate at most one contact) CoI_Name: James Liebert CoI_Institution: University of Arizona Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We request HST time in order to obtain a spectrum of Procyon B in a variety of wavelength ranges with the FOS. This spectrum will complement cycle 4 photometry done with WF/PC-2 and will allow us to determine the temperature and chemical composition of this critically important star. Procyon B is one of a handful of white dwarf stars which are in a visual binary system. These data will allow us to place Procyon B on the mass-radius relation, testing our concept of relativistic degeneracy. Furthermore, since the age of the system is known, we can determine the mass of Procyon B's progenitor star and thus provide an important fundamental datum to test theories of stellar mass loss. Questions ! Free format text (please update) Observing_Description: This is a very difficult observation, as Procyon A, one of the brightest stars in the sky, is only 5 arc-seconds away. We do not wish to damage the FOS, so the FOS team will have final approval of our observing strategy. Our approach is to observe long enough to obtain very high S/N spectra (S/N = 100). Given the difficulty of this observation, it seems sensible to make a small investment of time and do it right on the first try. We allow 2.5 orbits for target acquisition, making allowance for an interactive acquisition, and for the necessity of using the 0.3 arc second aperture to minimize scattered light. We also set aside one orbit to measure the background, we hope to use the paired square apertures to measure star and background simultaneously. Five gratings settings are required to observe the full ultraviolet and visible spectral range. Real_Time_Justification: The proximity of Procyon A requires an interactive acquisition. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: ALPHA-C-MI-B-OFFSET Description: STAR Position: RA=07H 39M 17.07S +/- 0.02S, DEC=05D 13' 21.9" +/- 0.19", ! PLATE-ID=0000 Equinox: J2000 RV_or_Z: RA_PM: Dec_PM: Epoch: Annual_Parallax: Flux: V=15.5 +/- 0.1, B-V=+0.7 Comments: offset star to acquire ALPHA-C-MI-B Target_Number: 2 Target_Name: ALPHA-C-MI-B Alternate_Names: BD+05D739C Description: STAR, DA, Position: RA=07H 39M 18.308S +/- 0.01S, DEC=05D 13' 32.28" +/- 0.1" ! PLATE-ID=0000 Equinox: J2000 RV_or_Z: RA_PM: -0.047 ! Units are seconds of time per year Dec_PM: -1.03 ! Units are seconds of arc per year Epoch: 2000 Annual_Parallax: 0.2864 Flux: V=10.7 +/- 0.6 ! Include at least V and B-V Comments: closeness of Procyon A makes mag and fluxes uncertain Visits ! Section 6 Visit_Number: 01 Visit_Requirements: ORIENT 28.93D TO 30.93D On_Hold_Comments: Visit_Comments: target aquisition via offset from nearby guide star, We were scheduled for 7 orbits, this approach uses only 5, but we still may require the other two for interactive acquisition. Exposure_Number: 1 ! Section 6.5 Target_Name: ALPHA-C-MI-B-OFFSET Config: FOS/RD Opmode: ACQ/BINARY Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 8S Special_Requirements: ONBOARD ACQuisition for 2 Comments: Offset star to acquire Procyon B Exposure_Number: 2 ! Section 6.5 Target_Name: ALPHA-C-MI-B-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.25-PAIR Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-X=0.17, SCAN-STEP-Y=0.17, SEARCH-SIZE-X=5, SEARCH-SIZE-Y=5 Number_of_Iterations: 1 Time_Per_Exposure: 1S Special_Requirements: ONBOARD ACQuisition FOR 3 ! Section 7.2 Exposure_Number: 3 ! Section 6.5 Target_Name: ALPHA-C-MI-B-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.25-PAIR Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-X=0.052, SCAN-STEP-Y=0.052, SEARCH-SIZE-X=5, SEARCH-SIZE-Y=5 Number_of_Iterations: 1 Time_Per_Exposure: 6S Special_Requirements: ONBOARD ACQuisition FOR 4 Comments: Exposure_Number: 4 ! Section 6.5 Target_Name: ALPHA-C-MI-B-OFFSET Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 1S Special_Requirements: ! Section 7.2 Exposure_Number: 5 Target_Name: ALPHA-C-MI-B Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.25-PAIR Sp_Element: G270H Wavelength: Optional_Parameters: SCAN-STEP-X=0.052, SCAN-STEP-Y=0.052, SEARCH-SIZE-X=5, SEARCH-SIZE-Y=5 Number_of_Iterations: 1 Time_Per_Exposure: 1S Special_Requirements: ONBOARD ACQuisition FOR 6-9 Comments: Procyon B should be in the aperture closest to Procyon A Exposure_Number: 6 ! Section 6.5 Target_Name: ALPHA-C-MI-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G190H Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 1080S Special_Requirements: ! Section 7.2 Exposure_Number: 7 ! Section 6.5 Target_Name: ALPHA-C-MI-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 5M Special_Requirements: ! Section 7.2 Exposure_Number: 8 ! Section 6.5 Target_Name: ALPHA-C-MI-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G570H Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 5M Special_Requirements: ! Section 7.2 Exposure_Number: 9 ! Section 6.5 Target_Name: ALPHA-C-MI-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Wavelength: Optional_Parameters: Number_of_Iterations: 2 Time_Per_Exposure: 7M Special_Requirements: ! Section 7.2 Comments: Procyon B should be in the aperture closest to Procyon A 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: ! ! Physics and Astronomy Departmen ! t,University of Delaware,Newark ! , Delaware 19716 ! ! 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