! File: 2342C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:05:11:05 coverpage: title_1: THE SYMBIOTIC PHENOMENA sci_cat: STELLAR ASTROPHYSICS sci_subcat: ERUPTIVE BINARIES proposal_for: GO pi_title: DR. pi_fname: A. pi_mi: G. pi_lname: MICHALITSIANOS pi_inst: NASA, GODDARD pi_country: USA pi_phone: 301-286-6177 keywords_1: INTERACTING BINARY, SYMBIOTIC STAR, ACCRETION hours_pri: 2.59 num_pri: 1 pi_position: ASTROPHYSICIST off_fname: JAMES off_mi: H. off_lname: TRAINOR off_title: DIRECTOR off_inst: NASA/GODDARD SPACE FLIGHT CENTER off_addr_1: SPACE AND EARTH SCIENCES off_addr_2: CODE 600 off_city: GREENBELT off_state: MD off_zip: 20771 off_country: USA ! end of coverpage abstract: line_1: Symbiotic stars are interacting binaries. The relevant line_2: interaction processes line_3: include mass expulsion from a common envelope between line_4: the two stars, collimated line_5: flows, accretion disk formation around the compact hot line_6: star, evolution of line_7: outbursts, as well as mass outflow leading to jet-like line_8: features with line_9: particularly intriguing characteristics. However, the line_10: nature of these systems line_11: and the physical processes that explain their behavior line_12: remain unsettled. line_13: Spectroscopy with HRS will decisively advance our line_14: knowledge of the kinematical line_15: and ionization structure of the central HII region that line_16: surrounds the binary. line_17: It is hoped that this will finally answer the line_18: controversial question concerning line_19: the nature of the hot object in symbiotics. High spatial line_20: resolution radio ! ! end of abstract general_form_proposers: lname: MICHALITSIANOS fname: A. title: P.I. mi: G. inst: NASA, GODDARD country: USA ! lname: KAFATOS fname: MINAS title: DR. inst: GEORGE MASON UNIVERSITY country: USA ! lname: NUSSBAUMER fname: HARRY title: DR. inst: ZURICH ASTRONOMY INSTITUTE country: SWITZERLAND esa: X ! lname: title: DR. inst: STSCI country: USA ! lname: FAHEY fname: RICHARD title: DR. inst: NASA, GODDARD SPACE FLIGHT CENTER country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We are particularly interested in the 1200-2000A wavelength line_2: range. The spectra of symbiotics indicates a hot object line_3: (stellar atmosphere or accretion disk) with a steeply line_4: rising continuum below 1400A. At longer wavelengths the line_5: nebular emission dominates the continuum. At shorter wave- line_6: lengths in the UV accessible with HRS the important line_7: intersystem emission lines of N III], N IV], O III], line_8: O IV] are important to observe in order to determine the line_9: emission measure of the photoexcited nebulosity that line_10: engulfs the M giant or Mira and compact hot star and/or line_11: accretion disk. We have selected R Aquarii as our line_12: primary target to investigate the ionization structure of line_13: intersystem line emitting regions. This program line_14: calls for obtaining HRS spectra using a combination of line_15: small and large science apertures on the central star, line_16: and at three selected offset positions from R Aquarii line_17: which coincide with the position of radio knot line_18: structures that comprise the R Aqr jet. The 1950.0 line_19: coordinates for these radio knots were obtained with line_20: VLA, and are precise to 0.1 arcsec. line_21: A description of our proposed observations with HRS line_22: follows. ! question: 4 section: 0 line_1: By their very nature symbiotics demand observations in the line_2: far-UV. Contrary to other classes of double star systems, line_3: the far-UV, optical and infrared wavelength bands can be line_4: used to distinguish the stellar components of the system. line_5: This follows because the luminous cool M giant of the line_6: system makes essentially no contribution in the near or line_7: far-UV. IUE has provided a tremendous boost to research line_8: in symbiotic stars. However, the limited sensitivity and line_9: dynamic range of IUE has seriously limited our ability to line_10: detect the underlying far-UV continuum. HST will enable us line_11: to spatially resolve extended structure in systems such as line_12: R Aquarii. A velocity resolution of a few km/s is required line_13: in order to apply models of interacting winds, which is not line_14: possible with IUE. The small aperture capability of HRS and line_15: 0.1" pointing capabilities of the HST will enable us for line_16: first time to isolate extended structure believed formed line_17: as a result of collimated mass ejection from the system. line_18: UV line profile structure determined at different offsets line_19: is essential to follow the development of shock structure line_20: and address a number of questions concerning the physics of line_21: shock formation in the inner and outer nebulosities of R AQR line_22: by examining the run of density, temperature, velocity. ! question: 5 section: 1 line_1: The exposure times are based on absolute fluxes obtained line_2: from IUE low resolution spectra. For all offset pointings line_3: including R AQR POS1 (central binary) the G140L grating line_4: (R=2000) will be used for all wavelength settings, which line_5: will ensure coverage of the continuum and the following line_6: spectral lines: N V, N IV], N III], O I, O III], O IV], line_7: O V, C II, C IV, Ne III, He II, Ne V, Si II, and Si IV. line_8: Multiple pointings of the extended structure of R Aqr line_9: are required to isolate the various radio/optical knots line_10: associated with the jet using the 0.25" and 2.0" science line_11: apertures. FOC GTO images presently allocated to R Aqr will line_12: be used together with VLA radio maps to properly line_13: locate the HRS apertures on the extended radio/optical line_14: features (see Fig 1 of proposal). For R Aqr (central line_15: binary) the exposure times are calculated as follows: line_16: the abs. flux for C IV is 3x10E-12 erg/sq cm sec Angstrom. line_17: The calibration curve for the G140L grating at 1550A is line_18: approxmiately 10E13 cts/diode/sec per erg sq cm per sec per line_20: Angstrom, corresponding to about 30 cts/diode/sec. At a line line_21: width of approximately 5A, a s/n of approximately 100 is line_22: needed to properly expose the broadened wings of C IV. ! !end of general form text general_form_address: lname: MICHALITSIANOS fname: A. mi: G. title: DR. category: PI inst: NASA GODDARD SPACE FLIGHT CENTER addr_1: CODE 684.1 city: GREENBELT state: MD zip: 20771 country: USA ! lname: KAFATOS fname: MINAS title: DR. inst: GEORGE MASON UNIVERSITY addr_2: 4400 UNIVERSITY DRIVE city: FAIRFAX state: VA zip: 22030 country: USA phone: 703-323-2303 ! lname: NUSSBAUMER fname: HARRY title: DR. inst: ETH ZURICH addr_1: INST. FOR ASTRONOMY addr_2: CH-8092 ZENTRUM city: ZURICH country: SWITZERLAND phone: (1) 256-3813 ! lname: PARESCE fname: FRANCO title: DR. inst: STSCI addr_1: JOHNS HOPKINS UNIVERSITY addr_2: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA phone: 301-338-4823 ! lname: FAHEY fname: RICHARD title: DR. inst: NASA GODDARD SPACE FLIGHT CENTER addr_1: CODE 684.1 addr_2: GREENBELT state: MD zip: 20771 country: USA phone: 301-286-9877 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: R-AQR-POS1 descr_1: STAR-TYPE = SYMBIOTIC STAR pos_1: RA = 23H 41M 14.26S +/- 0.001S, pos_2: DEC = -15D 33' 43" +/- 0.01" equinox: 1950 pos_epoch_bj: B pos_epoch_yr: 1983.00 ra_pm_val: 0.000007 dec_pm_val: -0.0210 comment_1: R-AQR-POS 1 AT CENTRAL H II REGION comment_2: INTERACTING BINARY IN H II REGION fluxnum_1: 1 fluxval_1: V = 8.5 +/- 2.5, TYPE = ME 7, E(B-V)=0.1 ! targnum: 2 name_1: R-AQR-POS2 descr_1: NEBULA, RADIO KNOT pos_1: RA-OFF = +0.227S +/- 0.001S, pos_2: DEC-OFF = +6.0" +/- 0.01", FROM 1 equinox: 1950 pos_epoch_bj: B pos_epoch_yr: 1983.00 comment_1: R-AQR-POS 2, OFFSET TO FOURTH KNOT comment_2: RADIO KNOT 6.0" NE FROM R AQR POS1 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 0.500 targname: R-AQR-POS1 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 22.1M priority: 1 param_1: MAP=ALL-POINTS,LOCATE=NO, param_2: BRIGHT=65535.0, param_3: FAINT=65535.0, param_4: SEARCH-SIZE=5 req_1: EARLY ACQ FOR 1.0; CYCLE 1/ 0.5-8.000 comment_1: EARLY ACQ WILL HELP PROVIDE comment_2: COORD.S FOR CENTERING THE LG. AND SM. comment_3: APERTURES FOR GHRS AT VARIOUS REGIONS comment_4: OF THE R AQR SYSTEM THAT INCLUDES A comment_5: VARIABLE UV STAR AND CONCENTRATED comment_6: KNOTS OF UV EMISSION ADJACENT TO STAR ! linenum: 1.000 targname: R-AQR-POS1 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 160S fluxnum_1: 1 priority: 1 param_1: BRIGHT=65535,FAINT=1, param_2: SEARCH-SIZE=1 req_1: ONBOARD ACQ FOR 1.500-8.000 ! linenum: 1.500 targname: R-AQR-POS1 config: HRS opmode: IMAGE aperture: 2.0 sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 774.4S fluxnum_1: 1 priority: 1 comment_1: TAKE MAP AFTER CENTERING comment_2: STEP-TIME=1.60 SEC ! linenum: 2.000 targname: ^ config: ^ opmode: ACCUM aperture: 2.0 sp_element: G160M wavelength: 1535-1565 num_exp: 1 time_per_exp: 100S s_to_n: 10 priority: 1 comment_1: SCIENCE EXPOSURE IN 2.0" APERTURE ! linenum: 3.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G200M wavelength: 1875-1915 num_exp: ^ time_per_exp: 100S s_to_n: 10 priority: 1 ! linenum: 4.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G200M wavelength: 1740-1780 num_exp: ^ time_per_exp: 630S s_to_n: 10 priority: 1 ! linenum: 4.500 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G270M wavelength: 2523-2563 num_exp: ^ time_per_exp: 440S s_to_n: 10 priority: 1 ! linenum: 5.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G270M wavelength: 2607-2651 num_exp: ^ time_per_exp: 220S s_to_n: 5 priority: 1 ! linenum: 5.500 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: 2779-2821 num_exp: ^ time_per_exp: 100S s_to_n: 5 priority: 1 ! linenum: 6.000 targname: R-AQR-POS2 config: HRS opmode: ACCUM aperture: 2.0 sp_element: G160M wavelength: 1535-1565 num_exp: 1 time_per_exp: 450S s_to_n: 10 priority: 1 comment_1: OFFSET FROM R-AQR-POS 1 TO R AQR-POS 2 comment_2: SCIENCE EXPOSURE IN 2.0" APERTURE ! linenum: 6.500 targname: R-AQR-POS2 config: HRS opmode: ACCUM aperture: 2.0 sp_element: G200M wavelength: 1875-1915 num_exp: 1 time_per_exp: 500S s_to_n: 5 priority: 1 ! linenum: 7.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G160M wavelength: 1735-1765 num_exp: 1 time_per_exp: 400S s_to_n: 5 priority: 1 ! linenum: 7.500 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: 1225-1255 num_exp: 1 time_per_exp: 400S s_to_n: 10 priority: 1 ! linenum: 8.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G270M wavelength: 2779-2821 num_exp: 1 time_per_exp: 400S s_to_n: 10 priority: 1 ! ! end of exposure logsheet ! No scan data records found