! File: 4646C.PROP ! Database: PEPDB ! Date: 22-FEB-1994:21:01:21 coverpage: title_1: UV SPECTRA OF WC STARS IN M33-CYC3 sci_cat: HOT STARS sci_subcat: MASSIVE STARS proposal_for: GO pi_title: DR pi_fname: ALLAN pi_mi: J pi_lname: WILLIS pi_inst: 8090 pi_country: UNITED KINGDOM pi_phone: 071 387 7050 hours_pri: 9.25 num_pri: 3 fos: Y off_fname: SIR ROBERT off_lname: WILSON off_title: DEPARTMENT HEAD off_inst: 8090 off_addr_1: DEPARTMENT OF PHYSICS AND ASTRONOMY off_addr_2: GOWER STREET off_city: LONDON WC1E 6BT off_country: UK off_phone: 071-387-7050 ! end of coverpage abstract: line_1: We propose to use the FOS to secure the first ultraviolet spectra of a small line_2: sample of carefully selected WC stars in M33. These UV data, complemented line_3: by our optical spectra, will be analysed using state-of-the-art NLTE model line_4: atmosphere codes, to provide quantitative measurements of their physical, line_5: chemical and mass loss properties, for comparison with WC counterparts in the line_6: Galaxy and Magellanic Clouds. line_7: The acquisition and analysis of our planned FOS spectra will provide: line_8: (i) the first UV spectral morphological comparison of WC stars in M33 with line_9: counterparts in the Galaxy and LMC, line_10: (ii)the first quantitative measurements of the physical, chemical and mass line_11: properties of WR stars beyond the Magellanic Clouds, line_12: (iii) a quantitative test of the identification from our optical spectra of line_13: a real physical relation between WC wind velocity and galactocentric distance line_14: (and possibly metallicity) in M33, line_15: (iv) a detailed comparative analysis with the Galaxy and LMC WC stars which line_16: should shed light on the reasons for gross WR population differences in line_17: different local group galaxies and overall massive stellar evolution. ! ! end of abstract general_form_proposers: lname: WILLIS fname: ALLAN title: PI mi: J inst: 8090 country: UK esa: Y ! lname: SMITH fname: LINDA mi: J inst: 8090 country: UK esa: Y ! lname: SCHILD fname: HANS mi: R inst: 8090 country: UK esa: Y ! lname: CONTI fname: PETER mi: S inst: 1764 country: USA esa: N ! lname: VAN DER HUCHT fname: KAREL mi: A inst: 6854 country: NETHERLANDS esa: Y ! lname: DE LOORE fname: CAMILLE inst: 4370 country: BELGIUM esa: Y ! lname: VREUX fname: JEAN-MARIE inst: LIEGE UNIVERSITY country: BELGIUM esa: Y ! lname: DRISSEN fname: LAURENT inst: 3470 country: USA esa: N ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: For each target star we require one exposure with each of the FOS blue line_2: gratings G130H, G190H and G270H at R=1300, thus covering the full UV line_3: wavelength range. The following sequence is suggested: line_4: (i) ACQUIRE using the 4.3 arcsec FOS aperture and standard on-board line_5: binary acquisition programme, (ii) relevant individual exposures using line_6: the FOS blue gratings using the 4.3-arcsec aperture. From our optical line_7: finding charts and experience with optical acquisition and spectroscopy line_8: we anticipate no source confusion in this aperture. line_10: Continuum UV fluxes (in erg/cm2/s/A) have been computed for each target line_11: at relevant wavelengths for the different FOS blue gratings, using our line_12: IUE spectrophotometry of LMC WC stars (Smith and Willis 1983) for line_13: comparison, scaling by the respective b-magnitudes. The reddening of line_14: the M33 stars and the LMC comparisons are both similar and small line_15: (Av less than 0.1 mag.). For the continuum we have adopted a requirement line_16: of a SNR=20/diode (in the emission lines, which are typically line_17: x2 the continuum the SNR will be even higher). line_18: The 4.3 arcsec aperture has been chosen to maximise throughput, whilst line_19: maintaining adequate spectral resolution, of about 2-4A, which our line_20: previous IUE spectra of LMC WR stars have shown to be amenable for line_21: quantitative model atmosphere analysis. ! question: 4 section: 1 line_1: In order to determine meaningful measurements of the physical line_2: nature (Te, Ne, Teff), chemical abundances (C/N/O/He) and mass line_3: loss properties (V(terminal), v(r), dM/dt) of the WR atmospheres/winds, line_4: ultraviolet spectra are required covering the wavelength range line_5: 1400-3300A (embracing important diagnostic transitions in both line_6: resonance lines, intercombination and recombination lines). The HST line_7: FOS is the only instrument capable of securing such data for WR line_8: stars beyond the Galaxy and Magellanic Clouds. Our, ongoing, line_9: long-term programme of UV studies of WR stars in different line_10: galaxies has been pursued for many years using IUE and earlier line_11: UV space instrumentation for galactic and MC objects, and the next line_12: logical step is to extend this programme to M33, which only the HST line_13: can accomplish. We have undertaken extensive ground-based studies of line_14: WR stars in Local Group galaxies, with Conti and Massey discovering line_15: most of the WR population in M33. Optical spectroscopy and photometry line_16: has been secured for each of our programme targets which will line_17: complement the UV spectra sought in this application. ! question: 4 section: 2 line_1: For each star and FOS/BL grating, exposure times have been computed line_2: using data supplied in the updated FOS instrument handbook (Version line_3: 2.2) supplemented by data in the Cycle 3 HST Technical Information line_4: update. UV fluxes at 1500A, 1800A, and 2700A (in erg/cm2/s/A) are line_5: given below and corresponding exposure times in, respectively, G130H, line_6: G190H and G270H line_7: MC6: F1500=4.0e-15 (100M): F1800=2.2e-15 (50M): F2700=9.4e-16 (20M) line_8: MC53: F1500=3.1e-15 (125M): F1800=1.6e-15 (65M): F2700=7.1e-16 (25M) line_9: MC44: F1500=4.0e-15 (100M): F1800=2.2e-15 (50M): F2700=9.4e-16 (20M) line_10: The above exposure times are computed for a FOS 4.3-arcsec aperture, line_11: with the FOS ACCUM mode, and a prescribed SNR=20 per diode. ! question: 7 section: 1 line_1: The proposed FOS spectra wil be initially reduced and analysed at UCL line_2: using the STARLINK interactive data processing facility on site. line_3: The Department of Physics and Astronomy at UCL houses one of the main line_4: UK nodes of the Starlink network, using a microVax 3500, Vax and UNIX line_5: workstations and associated, extensive data reduction/analysis hardware line_6: (tape/disk drives, high resolution colour image displays, high quality line_7: graphics terminals etc.). line_9: At UCL we have on line within Starlink, and also on the RAL Cray X-MP line_11: machine, state-of-the-art model atmosphere codes (developed by line_12: Dr D J Hillier) for computing theoretical WR spectra for comparison line_13: with observed spectra. These codes include the full radiative transfer line_14: solution, in both lines and continua, in moving, extended atmospheres line_15: with a full NLTE solution, which will be used to derive the physical, line_16: chemical and mass loss properties of our M33 WC sample. ! question: 10 section: 1 line_1: The data reduction and analysis will be based at UCL which houses line_2: extensive interactive computing facilities provided by STARLINK. line_3: Additionally, we have direct access to model atmosphere codes at UCL, line_4: Liege, and JILA and stellar evolutionary codes in Brussels. The UV line_5: Astronomy group at UCL is supported by an average of three postgraduate line_6: students and three postdoctoral research assistants per year which we line_7: will draw upon to provide basic manpower support to this programme. line_9: Similar levels of support are available to the co-investigators. line_11: The main funding within the UCL-base of the programme will come from line_12: UK sources accommodated within the P.I.'s current level of research line_13: grant support. ! !end of general form text general_form_address: lname: WILLIS fname: ALLAN mi: J category: PI inst: 8090 addr_1: Department of Physics and Astronomy addr_2: Gower Street city: London WC1E 6BT country: UK phone: 071-387-7050 telex: 28722 UCPHYS G ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: M33-MC6 descr_1: B,102 pos_1: RA=01H32M58.10S +/- 0.1S, pos_2: DEC=+30D35'50.3" +/-1.0" equinox: 2000 rv_or_z: V=-200 fluxnum_1: 1 fluxval_1: V=18.8+/-0.3, TYPE=WC fluxnum_2: 2 fluxval_2: E(B-V)=0.04 fluxnum_3: 3 fluxval_3: F-CONT(1500)=4.0 E-15 fluxnum_4: 4 fluxval_4: F-CONT(1800)=2.2 E-15 fluxnum_5: 5 fluxval_5: F-CONT(2700)=9.4 E-16 ! targnum: 2 name_1: M33-MC44 descr_1: B,102 pos_1: RA=01H33M42.45S +/- 0.05S, pos_2: DEC=+30D33'15.5" +/- 0.5" equinox: 2000 rv_or_z: V=-200 fluxnum_1: 1 fluxval_1: V=18.8+/-0.2, TYPE=WC fluxnum_2: 2 fluxval_2: E(B-V)=0.04 fluxnum_3: 3 fluxval_3: F-CONT(1500)=4.0 E-15 fluxnum_4: 4 fluxval_4: F-CONT(1800)=2.2 E-15 fluxnum_5: 5 fluxval_5: F-CONT(2700)=9.4 E-16 ! targnum: 3 name_1: M33-MC53 descr_1: B,102 pos_1: RA=01H33M50.22S +/- 0.05S, pos_2: DEC=+30D41'34.6" +/- 0.5" equinox: 2000 rv_or_z: V=-200 fluxnum_1: 1 fluxval_1: V=19.1+/-0.2, TYPE=WC fluxnum_2: 2 fluxval_2: E(B-V)=0.04 fluxnum_3: 3 fluxval_3: F-CONT(1500)=3.1 E-15 fluxnum_4: 4 fluxval_4: F-CONT(1800)=1.6 E-15 fluxnum_5: 5 fluxval_5: F-CONT(2700)=7.1 E-16 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: M33-MC6 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 30S fluxnum_1: 1 priority: 2 param_1: SEARCH-SIZE-X=1, param_2: SEARCH-SIZE-Y=3, param_3: SCAN-STEP-Y=1.4 req_1: ONBOARD ACQ FOR 1.5; req_2: CYCLE 3 ! linenum: 1.500 targname: M33-MC6 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: MIRROR num_exp: 1 time_per_exp: 30S fluxnum_1: 1 priority: 2 param_1: SEARCH-SIZE-X=6, param_2: SEARCH-SIZE-Y=2, param_3: SCAN-STEP-Y=0.7, param_4: SCAN-STEP-X=0.7 req_1: ONBOARD ACQ FOR 2-4; req_2: CYCLE 3 ! linenum: 2.000 targname: M33-MC6 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G130H wavelength: 1150-1606 num_exp: 1 time_per_exp: 100M s_to_n: 20 fluxnum_1: 3 priority: 2 req_2: CYCLE 3 ! linenum: 3.000 targname: M33-MC6 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G190H wavelength: 1573-2330 num_exp: 1 time_per_exp: 50M s_to_n: 20 fluxnum_1: 4 priority: 2 req_2: CYCLE 3 ! linenum: 4.000 targname: M33-MC6 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G270H wavelength: 2222-3301 num_exp: 1 time_per_exp: 20M s_to_n: 20 fluxnum_1: 5 priority: 2 req_2: CYCLE 3 ! linenum: 5.000 targname: M33-MC44 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 30S fluxnum_1: 1 priority: 3 param_1: SEARCH-SIZE-X=1, param_2: SEARCH-SIZE-Y=3, param_3: SCAN-STEP-Y=1.4 req_1: ONBOARD ACQ FOR 5.5; req_2: CYCLE 3 ! linenum: 5.500 targname: M33-MC44 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: MIRROR num_exp: 1 time_per_exp: 30S fluxnum_1: 1 priority: 3 param_1: SEARCH-SIZE-X=6, param_2: SEARCH-SIZE-Y=2, param_3: SCAN-STEP-Y=0.7, param_4: SCAN-STEP-X=0.7, req_1: ONBOARD ACQ FOR 6-8; req_2: CYCLE 3 ! linenum: 6.000 targname: M33-MC44 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G130H wavelength: 1150-1606 num_exp: 1 time_per_exp: 100M s_to_n: 20 fluxnum_1: 3 priority: 3 req_2: CYCLE 3 ! linenum: 7.000 targname: M33-MC44 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G190H wavelength: 1573-2330 num_exp: 1 time_per_exp: 50M s_to_n: 20 fluxnum_1: 4 priority: 3 req_2: CYCLE 3 ! linenum: 8.000 targname: M33-MC44 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G270H wavelength: 2222-3301 num_exp: 1 time_per_exp: 20M s_to_n: 20 fluxnum_1: 5 priority: 3 req_2: CYCLE 3 ! linenum: 9.000 targname: M33-MC53 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 30S fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE-X=1, param_2: SEARCH-SIZE-Y=3, param_3: SCAN-STEP-Y=1.4 req_1: ONBOARD ACQ FOR 9.5; req_2: CYCLE 3 ! linenum: 9.500 targname: M33-MC53 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: MIRROR num_exp: 1 time_per_exp: 60S fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE-X=6, param_2: SEARCH-SIZE-Y=2, param_3: SCAN-STEP-Y=0.7, param_4: SCAN-STEP-X=0.7, req_1: ONBOARD ACQ FOR 10-12; req_2: CYCLE 3 ! linenum: 10.000 targname: M33-MC53 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G130H wavelength: 1150-1606 num_exp: 1 time_per_exp: 125M s_to_n: 20 fluxnum_1: 3 priority: 1 req_2: CYCLE 3 ! linenum: 11.000 targname: M33-MC53 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G190H wavelength: 1573-2330 num_exp: 1 time_per_exp: 65M s_to_n: 20 fluxnum_1: 4 priority: 1 req_2: CYCLE 3 ! linenum: 12.000 targname: M33-MC53 config: FOS/BL opmode: ACCUM aperture: 4.3 sp_element: G270H wavelength: 2222-3301 num_exp: 1 time_per_exp: 25M s_to_n: 20 fluxnum_1: 5 priority: 1 req_2: CYCLE 3 ! ! end of exposure logsheet ! No scan data records found