! Proposal 6783, submission 1 ! PI: Alexander Brown ! Received Mon Feb 19 10:14:43 EST 1996 ! From: ab@casa.Colorado.EDU ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6783,v 9.1 1996/10/29 17:16:57 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6783,v 9.1 1996/10/29 17:16:57 pepsa Exp $ ! ! For help call your Program Coordinator: Manning ! Phone: 410-338-4456 , E-mail: manning@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-1008.brown.prop ! Date generated: Fri Dec 22 16:58:23 EST 1995 ! Proposal_Information ! Section 4 Title: ACTIVITY ON THE EDGE OF CONVECTION: THE ATMOSPHERE OF CANOPUS (F0 Ib-II) Proposal_Category: GO Scientific_Category: COOL STARS Cycle: 6 Investigators PI_name: Alexander Brown PI_Institution: University of Colorado CoI_Name: Stephen Skinner CoI_Institution: University of Colorado Contact: ! Y or N (designate at most one contact) CoI_Name: Tom Ayres CoI_Institution: University of Colorado Contact: ! Y or N (designate at most one contact) CoI_Name: Brian Wood CoI_Institution: University of Colorado Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose GHRS observations of Canopus (Alpha Car), the nearest (40 pc) supergiant star. Canopus is an early F supergiant with a extremely thin convection zone, yet it shows significant X-ray emission from a very hot corona. UV chromospheric and transition (TR) region emission line fluxes will be used to determine the emission measure (EM) distribution and radiative losses from these regions, while the nonthermal turbulent motions in the TR will be measured from the emission profiles. EUVE and ASCA coronal spectroscopy are also being sought and will allow the coronal temperature and EM distributions to be established. In conjuction with similar data for Beta Dra (G2 Ib-IIa) we shall investigate how the TR turbulent energy relates to the observed coronal energy input for supergiants with differing convection zone depths. Questions ! Free format text (please update) Observing_Description: Canopus will be acquired with Mirror A1 and all spectra obtained using GHRS Side 1 gratings. The G140L exposure will provide a complete spectrum of the accessible UV emission lines of Canopus and allow accurate flux measurement for all available emission lines. The Echelle-A spectrum will give a high resolution H I Ly-Alpha profile suitable for radiative transfer modelling and for determination of the interstellar N_H column density, a quantity of great importance for the analysis of the coronal spectroscopy. The G140M spectra will measure the emission line profiles for the strongest TR emission lines available. The O I spectra will show the presence of any cool wind outflow. Exposure times and expected signal-to-noise (S/N) levels have been estimated by extrapolation from the observed emission levels of Beta Dra. The observed X-ray flux for Canopus is 1.7 times larger than that of Beta Dra (Maggio et al 1990). Using the scaling laws of Ayres et al. (1995), the TR emission fluxes should be a factor of 1.4 times brighter. In these estimates we have assumed that Canopus will have similar line widths to those measured by IUE and HST for Beta Dra. Very little increase in observing efficiency would result from the use of STIS for this project. The STIS and GHRS sensitivities are similar in the proposed spectral regions. Only 3 orbits are required with GHRS and even combining the G140M spectra into a single STIS exposure would have difficulty in saving one orbit. TABLE 1: Proposed Exposures ----------------------------------------------------------------- Grating Spectral Exposure S/N Diagnostic Features Range Time (A) (s) ----------------------------------------------------------------- ECH-A 1212-1218 1197 35 H I Ly-Alpha, ISM N_H G140L 1160-1446 544 100 Overall spectrum + line fluxes G140M 1198-1224 870 20 Si III UV 2 (1206 A), O V (1218 A) G140M 1227-1253 870 23 N V UV 1 G140M 1289-1314 870 30 O I UV 2 G140M 1331-1357 870 26 C II UV 1, O I UV 1 ----------------------------------------------------------------- Real_Time_Justification: There are no special restrictions on these observations. STScI may wish to note that Canopus lies very close to the CVZ at certain times of year, which may allow for more efficient scheduling. We are conducting a coordinated study of the outer atmosphere of Canopus involving HST, ASCA, and EUVE. The ASCA/EUVE observations will provide spectroscopy that will allow the coronal temperature and emission measure distribution to be determined. In addition, coronal elemental abundances should be obtainable. NB These observations do not require coordinated scheduling. Calibration_Justification: ! Move text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: HD45348 Alternate_Names: HIC30438,ALPHA-CAR Description: STAR, F0-F2 Position: RA=06H 23M 57.119S +/- 0.01S, ! from Hipparcos DEC=-52D 41' 44.50" +/- 0.03" ! Input Catalogue Equinox: 2000 ! equinox of Hipparcos Catalog RV_or_Z: V = +20.5 RA_PM: +0.0024 ! Units are seconds of time per year Dec_PM: +0.021 ! Units are seconds of arc per year Epoch: 2000 ! Epoch of Hipparcos Catalog Annual_Parallax: 0.025 Flux: V= -0.72 +/- 0.01, B-V= +0.16 +/- 0.01, TYPE= F0I Comments: Visits Visit_Number: 1 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: HD45348 Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N1 Wavelength: Optional_Parameters: BRIGHT=RETURN, SEARCH-SIZE=3 Number_of_Iterations: 1 Time_Per_Exposure: 1.8S Special_Requirements: ONBOARD ACQ FOR 3 Comments: STEP-TIME = 0.2 SEC (approx 100,000 cts in STEP-TIME) Exposure_Number: 2 Target_Name: HD45348 Config: HRS Opmode: IMAGE Aperture: 2.0 Sp_Element: MIRROR-A1 Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 51.2S Special_Requirements: Comments: STEP-TIME = 0.2 SEC (approx 500,000 cts in STEP-TIME) Exposure_Number: 3 Target_Name: HD45348 Config: HRS Opmode: ACQ/PEAKUP Aperture: 0.25 Sp_Element: MIRROR-A1 Wavelength: Optional_Parameters: SEARCH-SIZE=5 Number_of_Iterations: 1 Time_Per_Exposure: 5S Special_Requirements: ONBOARD ACQ FOR 10-55 Comments: STEP-TIME = 0.2 SEC ! Exposure_Number: 4 ! Target_Name: HD45348 ! Config: HRS ! Opmode: ACQ/PEAKUP ! Aperture: 0.25 ! Sp_Element: MIRROR-A1 ! Wavelength: ! Optional_Parameters: SEARCH-SIZE=5 !Number_of_Iterations: 1 ! Time_Per_Exposure: 10S !Special_Requirements: ONBOARD ACQ FOR 10-55 ! Comments: STEP-TIME = 0.4 SEC (added) Exposure_Number: 10 Target_Name: HD45348 Config: HRS Opmode: ACCUM Aperture: 0.25 Sp_Element: ECH-A Wavelength: 1216.0 Optional_Parameters: COMB=FOUR, STEP-PATT=DEF, DOPPLER=DEF, FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 1196.8S Special_Requirements: Comments: Exposure_Number: 15 Target_Name: HD45348 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1312.0 Optional_Parameters: COMB=FOUR, STEP-PATT=DEF, DOPPLER=DEF,FP-SPLIT=DSTWO Number_of_Iterations: 1 Time_Per_Exposure: 544.0S Special_Requirements: Comments: Exposure_Number: 25 Target_Name: HD45348 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140M Wavelength: 1210.0 Optional_Parameters: COMB=FOUR, STEP-PATT=DEF, DOPPLER=DEF, FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 870.4S Special_Requirements: Comments: Exposure_Number: 35 Target_Name: HD45348 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140M Wavelength: 1242.0 Optional_Parameters: COMB=FOUR, STEP-PATT=DEF, DOPPLER=DEF, FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 870.4S Special_Requirements: Comments: Exposure_Number: 45 Target_Name: HD45348 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140M Wavelength: 1299.0 Optional_Parameters: COMB=FOUR, STEP-PATT=DEF, DOPPLER=DEF, FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 870.4S Special_Requirements: Comments: Exposure_Number: 55 Target_Name: HD45348 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140M Wavelength: 1344.0 Optional_Parameters: COMB=FOUR, STEP-PATT=DEF, DOPPLER=DEF, FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 870.4S Special_Requirements: Comments: Data_Distribution Medium: 8MM Blocking_Factor: 10 Ship_To: Center for Astrophysics and Space Astronomy, Campus Box 389, Boulder, CO 80309-0893 ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address !