! File: 3964C.PROP ! Database: PEPDB ! Date: 20-FEB-1994:01:49:55 coverpage: title_1: DYNAMICS AND ENERGY BALANCE IN STELLAR TRANSITION REGIONS title_2: CYCLE 2 sci_cat: STELLAR ASTROPHYSICS sci_subcat: COOL STARS proposal_for: AUG/HRS cont_id: 1176 pi_fname: JEFFREY pi_mi: L. pi_lname: LINSKY pi_inst: COLORADO, UNIVERSITY OF pi_country: USA pi_phone: (303)492-7838 keywords_1: STELLAR CHROMOSPHERES, STELLAR TRANSITION REGIONS, F-M keywords_2: DWARF STARS, G-K GIANT STARS, STELLAR ACTIVITY hours_pri: 3.66 num_pri: 1 pi_position: ASTROPHYSICIST ! end of coverpage abstract: line_1: Late-type stars with convective zones and magnetic fields line_2: have plasma above the photosphere heated to temperatures line_3: above 10,000 K. We will use the GHRS to study the dynamics, line_4: energy balance, and nonradiative heating rates in these hot line_5: regions for a sample of late-type stars spanning a range of line_6: spectral type and luminosity. We will study the dynamics of line_7: stellar transition regions by measuring the redshifts, line_8: indicative of downflows, with high precision in lines of line_9: C III, C IV, Si IV, and O IV. The energy balance and local line_10: heating rates in stellar transition regions will be derived line_11: from an emission measure analysis of emission line fluxes line_12: and electron densities inferred from density-sensitive line line_13: ratios. Cycle 0 observations of the RS CVn system Capella line_14: show that the GHRS can measure ALL of the UV intersystem line_15: lines of Si III, C III, O III, N III, O IV, and S IV, which are line_16: useful density diagnostics. These data may require atmospheric line_17: models with two components (quiet and active regions). ! ! end of abstract general_form_proposers: lname: BROWN fname: ALEXANDER inst: COLORADO, UNIVERSITY OF country: USA ! lname: LINSKY fname: JEFFREY mi: L. inst: COLORADO, UNIVERSITY OF country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We intend to observe 6 stars with the HRS with 2 grating settings each at line_2: low dispersion and 4 grating settings each at moderate dispersion. Two targets line_3: (HR 1099 and Capella) are spectroscopic binary systems and are to be observed line_4: at 1 or 2 phases each. HR 1099 is to be observed at a PHI = 0.75 quadrature. line_5: Capella is to be observed at a conjunction (PHI = 0.0 or 0.5) and at a PHI = line_6: 0.25 quadrature. Ephermerides for PHI = 0.0 are line_8: HR 1099: JD (helio) = 2,442,766.069 + 2d.83782E line_9: Capella: JD (helio) = 2,442,039.4 + 104d.0204E line_10: Capella was observed in Cycle 0 and AU Mic and Beta Dra in Cycle 1. ! question: 4 section: 1 line_1: Stellar transition regions can only be observed in the ultraviolet. ! question: 5 section: 1 line_1: Many of these targets are in common with our GTO program "Local line_2: Interstellar Medium and D/H Ratio" or the program "Coronal Flares" for which S. line_3: Maran is the PI. Since these targets are variable and the data from each line_4: program supports the other, we request that observations of the same target for line_5: both programs be contiguous in time with few data gaps. The observations of HR line_6: 1099 and Capella at conjunction and quadrature are to use the orbital radial line_7: velocity differences to seperate the spectra of the component stars. ! question: 7 section: 1 line_1: We have developed extensive computer programs to analyze these line_2: spectra using emission measure and model atmosphere techniques. ! question: 10 section: 1 line_1: Computer analysis codes and postdoctoral research associates to be line_2: funded by the HST GTO program. ! question: 12 section: 1 line_1: RPSS exposure estimates used. ! question: 13 section: 1 line_1: We propose to study the dynamics of stellar transition regions by line_2: measuring the redshifts, indicative of downflows, in lines of C III, line_3: Si III, C IV, Si IV, and O IV. The energy balance and heating rates line_4: in stellar chromospheres and transition regions will be derived from line_5: an emission measure analysis of emission line fluxes and densities line_6: inferred from density sensitive line ratios. Stars of interest line_7: include dwarf stars of spectral type F-M, active G and K giants, line_8: and RS CVn binary systems. ! !end of general form text general_form_address: lname: LINSKY fname: JEFFREY mi: L. category: PI inst: JILA, UNIVERSITY OF COLORADO addr_1: CAMPUS BOX 440 city: BOULDER state: CO zip: 80309 country: USA phone: 303-492-7838 telex: 755842JILA ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD61421 name_2: ALPHA-CMI descr_1: A,134 pos_1: RA=07H39M18.1S+/-.1S, pos_2: DEC=+5D13'30"+/-1" equinox: 2000 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.047067 ra_pm_unct: 0.000067 dec_pm_val: -1.0290 dec_pm_unct: 0.0010 an_prlx_val: 0.2920 rv_or_z: V=-3 fluxnum_1: 1 fluxval_1: V=.42 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: LISM1 targname: # config: HRS opmode: ACCUM aperture: 0.25 sp_element: G160M wavelength: 1223.70 num_exp: # time_per_exp: 108.8S s_to_n: 100 priority: # param_1: STEP-PATT=5, param_2: FP-SPLIT=STD ! linenum: 5.000 sequence_1: DEFINE sequence_2: LISM2 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ECH-B20 wavelength: 2800 num_exp: ^ time_per_exp: 54.4S s_to_n: ^ priority: ^ param_1: STEP-PATT=7 ! linenum: 6.000 sequence_1: DEFINE sequence_2: LISM3 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ECH-B22 wavelength: 2600 num_exp: ^ time_per_exp: 54.4S s_to_n: ^ priority: ^ param_1: STEP-PATT=7 ! linenum: 11.000 targname: HD61421 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 1.8S priority: 2 param_1: SEARCH-SIZE=3 param_2: BRIGHT=RETURN req_1: ONBOARD ACQ FOR 12; req_2: CYCLE 2/ 11-74; req_3: GROUP 11-74 NO GAP; req_4: SEQ 11-12; req_5: ZERO-PHASE JD2446795.5 +/- 0.001D; req_6: PERIOD 365.25D +/- 0.01D comment_1: STEP TIME = 200 MSEC comment_2: FAINT REVISED 19/MAY/1991. comment_3: FAINT=9000 ! linenum: 12.000 targname: HD61421 config: HRS opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 20.4S fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 14-74; req_2: PHASE 0.80 +/- 0.25 OF REF 11.0; comment_1: OBSERVE JULY 16 - JAN 19. comment_2: CENTER IN LSA AFTER NEW DEFCAL ! linenum: 14.000 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: G200M wavelength: 1900 num_exp: 1 time_per_exp: 32S priority: 2 param_1: STEP-PATT=3 req_1: CALIB FOR 15.0 NO SLEW; req_2: SEQ 14-15.0 NO GAP ! linenum: 15.000 targname: HD61421 config: ^ opmode: ^ aperture: 2.0 sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 136S priority: ^ param_1: STEP-PATT=5 ! linenum: 15.500 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: G160M wavelength: 1640 num_exp: 1 time_per_exp: 64S priority: 2 param_1: STEP-PATT=3 req_1: CALIB FOR 15.6 NO SLEW; req_2: SEQ 15.5-15.6 NO GAP ! linenum: 15.600 targname: HD61421 config: ^ opmode: ^ aperture: 2.0 sp_element: G160M wavelength: 1640 num_exp: 2 time_per_exp: 300S priority: ^ param_1: STEP-PATT=5 ! linenum: 15.900 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: G160M wavelength: 1550 num_exp: 1 time_per_exp: 64S priority: 2 param_1: STEP-PATT=3 req_1: CALIB FOR 16.0 NO SLEW; req_2: SEQ 15.9-16.0 NO GAP ! linenum: 16.000 targname: HD61421 config: ^ opmode: ^ aperture: 2.0 sp_element: ^ wavelength: 1550 num_exp: 2 time_per_exp: 191S priority: ^ param_1: STEP-PATT=5 ! linenum: 16.900 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: G160M wavelength: 1402 num_exp: 1 time_per_exp: 64S priority: 2 param_1: STEP-PATT=3 req_1: CALIB FOR 17 NO SLEW; req_2: SEQ 16.9-17.0 NO GAP ! linenum: 17.000 targname: HD61421 config: ^ opmode: ^ aperture: 2.0 sp_element: ^ wavelength: 1402 num_exp: 2 time_per_exp: 218S priority: ^ param_1: STEP-PATT=5 ! linenum: 69.000 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: G160M wavelength: 1223.70 num_exp: 1 time_per_exp: 64S priority: 1 param_1: STEP-PATT=3 req_1: CALIB FOR 70 NO SLEW; req_2: SEQ 69-70 NO GAP comment_1: NO CARROUSEL MOTION BETWEEN 69 AND 70 ! linenum: 70.000 sequence_1: USE sequence_2: LISM1 targname: HD61421 num_exp: 3 time_per_exp: X10 priority: 1 req_1: PHASE 0.80 +/- 0.25 OF REF 11.0 ! linenum: 71.000 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: ECH-B20 wavelength: 2800 num_exp: 1 time_per_exp: 32S priority: 1 param_1: STEP-PATT=3 req_1: CALIB FOR 72 NO SLEW; req_2: SEQ 71-72 NO GAP ! linenum: 72.000 sequence_1: USE sequence_2: LISM2 targname: HD61421 num_exp: 1 time_per_exp: X12 priority: 1 req_1: PHASE 0.80 +/- 0.25 OF REF 11.0 ! linenum: 73.000 targname: WAVE config: HRS opmode: ACCUM aperture: SC2 sp_element: ECH-B22 wavelength: 2600 num_exp: 1 time_per_exp: 32S priority: 1 param_1: STEP-PATT=3 req_1: CALIB FOR 74 NO SLEW; req_2: SEQ 73-74 NO GAP ! linenum: 74.000 sequence_1: USE sequence_2: LISM3 targname: HD61421 num_exp: 1 time_per_exp: X12 priority: 1 req_1: PHASE 0.80 +/- 0.21 OF REF 11.0; ! ! end of exposure logsheet ! No scan data records found