! File: 3989C.PROP ! Database: PEPDB ! Date: 20-FEB-1994:02:52:12 coverpage: title_1: TRANSITION REGIONS IN VERY LATE M DWARFS - PART II sci_cat: STELLAR ASTROPHYSICS sci_subcat: COOL STARS proposal_for: GTO/HRS pi_fname: JEFFREY pi_mi: L. pi_lname: LINSKY pi_inst: COLORADO, UNIVERSITY OF pi_country: USA pi_phone: (303) 492-7838 keywords_1: MS STAR, MV STARS, X-RAY STAR, FLARE STAR hours_pri: 6.29 num_pri: 5 pi_position: ASTROPHYSICIST ! end of coverpage abstract: line_1: We will measure emission lines, indicative of 10,000 to line_2: 100,000 K plasma, in the 1170-1700A spectra of a selected line_3: sample of M dwarf stars from spectral types M3 to M9, line_4: including both the dM and dMe classes. The measured fluxes in line_5: lines of C II, C IV, Si IV, and N V will permit us to line_6: derive transition region models for these stars and to line_7: estimate the radiative cooling rates, nonradiative heating line_8: rates, and the energy balance in the transition regions of line_9: these stars and to compare these quantities with those for line_10: stars of earlier spectral type. An critical question is line_11: whether transition regions disappear or have significantly line_12: smaller heating rates in stars cooler than about spectral line_13: type M6 as suggested by the X-ray data. If this very line_14: tentative result is supported by our observations, then it line_15: is likely than stellar dynamos and their magnetic flux line_16: generation rates are different for fully convective stars line_17: compared to stars with radiative envelopes. Theory predicts line_18: that stars become fully convective near spectral type M6. ! ! end of abstract general_form_proposers: lname: GIAMPAPA fname: MARK inst: NATIONAL SOLAR OBSERVATORY country: USA ! lname: LINSKY fname: JEFFREY mi: L. inst: COLORADO, UNIVERSITY OF country: USA ! lname: AMBRUSTER fname: CAROL inst: JILA, UNIVERSITY OF COLORADO country: USA ! lname: MARAN fname: STEPHEN mi: P. inst: NASA, GODDARD SPACE FLIGHT CENTER country: USA ! lname: BROWN fname: ALEXANDER inst: JILA, UNIVERSITY OF COLORADO country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: HRS observations of 7 stars are requested with one grating setting line_2: (G140L) for each star using the 2.0" aperture. There are no special line_3: requirements. We are obtaining data with a time resolution line_4: of 4.5 minutes to study time variability that may be due to line_5: flaring. ! question: 4 section: 1 line_1: There are no available transition region lines in the visible or infrared. ! question: 6 section: 1 line_1: We request that the observations not be interrupted to determine whether line_2: or not the emission is steady or highly variable indicative of flaring. ! question: 7 section: 1 line_1: We have written computer codes and tested them on available IUE spectra line_2: that determine the emission measure distribution, heating rates, line_3: pressure-temperature distribution, and energy balance for the chromosphere and line_4: transition region from ultraviolet emission line fluxes. ! question: 10 section: 1 line_1: We will supply data analysis and atmospheric modelling computer codes. ! question: 12 section: 1 line_1: The total observing time includes an estimated overhead of 100 seconds per line_2: target. ! question: 13 section: 1 line_1: This program will test the hypothesis that magnetic nonradiative heating line_2: processes become inefficient in the coolest M dwarf stars, including both dM line_3: and dMe stars. We will search for emission lines of C II, Si IV, C IV, and N V line_4: in a sample of 10 very late M dwarf stars and compare the surface fluxes with line_5: those from warmer stars to test the hypothesis. From the observed fluxes we line_6: will derive the emission measure distribution, nonradiative heating rates, and line_7: the local energy balance. ! !end of general form text general_form_address: lname: LINSKY fname: JEFFREY mi: L. category: PI inst: COLORADO, UNIVERSITY OF addr_1: CAMPUS BOX 440 city: BOULDER state: CO zip: 80309 country: USA phone: (303) 492-7838 telex: 755842 JILA ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD36705 name_2: AB-DORADUS descr_1: G0 V STAR pos_1: RA=05H28M35.821S+/-.01S, pos_2: DEC=-65D29'18.77"+/-0.1" equinox: 1950 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: 0.003467 ra_pm_unct: 0.000600 dec_pm_val: 0.1330 dec_pm_unct: 0.0090 an_prlx_val: 0.0333 rv_or_z: V=0 fluxnum_1: 1 fluxval_1: V=6.80 ! targnum: 2 name_1: RST137B descr_1: M3.5 V STAR pos_1: RA-OFF=-0.411S+/-0.08S, pos_2: DEC-OFF=+8.94"+/-0.5", pos_3: FROM 1 equinox: 1950 pm_or_par: N pos_epoch_bj: B pos_epoch_yr: 1950.00 rv_or_z: V=0 fluxnum_1: 1 fluxval_1: V=13.0 ! targnum: 3 name_1: GL699 name_2: BARNARDS-STAR descr_1: DM4 STAR pos_1: RA = 17H 55M 23S +/- 1S, pos_2: DEC = +04D 33' 24" +/- 3" equinox: 1950.00 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.050000 ra_pm_unct: 0.000067 dec_pm_val: 10.3100 dec_pm_unct: 0.0010 an_prlx_val: 0.5520 fluxnum_1: 1 fluxval_1: V = 9.54 ! targnum: 6 name_1: GL406 name_2: CN-LEO descr_1: DM6.5E STAR pos_1: RA = 10H 54M 06S +/-1S, pos_2: DEC = +07D 19' 12" +/-3" equinox: 1950.00 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.256667 ra_pm_unct: 0.000067 dec_pm_val: -2.7000 dec_pm_unct: 0.0010 an_prlx_val: 0.4260 fluxnum_1: 1 fluxval_1: V = 13.53 ! targnum: 8 name_1: LHS429 name_2: VB8 descr_1: DM7E STAR pos_1: RA = 16H 52M 55S +/-1S, pos_2: DEC = -08D 18' 12" +/-3" equinox: 1950.00 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.053600 ra_pm_unct: 0.000067 dec_pm_val: -0.8774 dec_pm_unct: 0.0010 an_prlx_val: 0.1471 fluxnum_1: 1 fluxval_1: V = 16.82 ! targnum: 9 name_1: LHS2065 descr_1: DM9E STAR pos_1: RA = 08H 51M 07S +/-1S, pos_2: DEC = -03D 17' 54" +/-3" equinox: 1950.00 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.036133 ra_pm_unct: 0.000067 dec_pm_val: -0.1951 dec_pm_unct: 0.0010 an_prlx_val: 0.1149 fluxnum_1: 1 fluxval_1: V = 18.74 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: DME targname: # config: HRS opmode: ACCUM aperture: 2.0 sp_element: G140L wavelength: 1427 num_exp: # time_per_exp: 272S priority: # param_1: STEP-PATT=5 req_1: NON-INT; comment_1: EXPOSURE SEQUENCE GIVING comment_2: 4.5 MIN TIME RESOLUTION ! linenum: 2.000 sequence_1: DEFINE sequence_2: ROSSITER targname: RST137B config: HRS opmode: ACCUM aperture: 2.0 sp_element: G160M wavelength: 1550 num_exp: 1 time_per_exp: 300S priority: 1 param_1: STEP-PATT=5 ! linenum: 2.050 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: 2.0 sp_element: G160M wavelength: 1550 num_exp: 3 time_per_exp: 272S priority: 1 param_1: STEP-PATT=5 req_1: COND IF TAC ! linenum: 2.100 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G140L wavelength: 1304 num_exp: 2 time_per_exp: 244.8S priority: ^ param_1: ^ ! linenum: 2.150 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G140L wavelength: 1574 num_exp: 1 time_per_exp: 272S priority: ^ param_1: ^ ! linenum: 2.200 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: G140L wavelength: 1574 num_exp: 2 time_per_exp: 272S priority: ^ param_1: ^ req_1: COND IF TAC ! linenum: 4.000 targname: GL699 config: HRS opmode: ACQ aperture: 2.0 sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 40S priority: 2 param_1: SEARCH-SIZE=5 param_2: FAINT=260 req_1: ONBOARD ACQ FOR 5; req_2: CYCLE 2/ 4-7; req_3: GROUP 4-7 NO GAP; req_4: SEQ 4-6 comment_1: STEP TIME = 1.6 SEC ! linenum: 5.000 targname: GL699 config: HRS opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 73.6S fluxnum_1: 1 priority: 2 req_1: ONBOARD ACQ FOR 6-7; req_2: COND IF TAC comment_1: STEP-TIME=1.6SEC comment_2: CENTER IN LSA AFTER NEW DEFCAL ! linenum: 6.000 targname: GL699 config: HRS opmode: IMAGE aperture: 2.0 sp_element: MIRROR-A2 num_exp: 1 time_per_exp: 96.8S priority: 2 req_1: COND IF TAC comment_1: TAKE MAP AFTER CENTERING comment_2: 200 MSEC INTEGRATIONS ! linenum: 6.500 sequence_1: USE sequence_2: DME targname: GL699 num_exp: 1 time_per_exp: X1 priority: 2 ! linenum: 7.000 sequence_1: USE sequence_2: DME targname: GL699 num_exp: 6 time_per_exp: X1 priority: 2 req_1: COND IF TAC ! linenum: 16.000 targname: GL406 config: WFC opmode: IMAGE aperture: W1 sp_element: F702W num_exp: 1 time_per_exp: 12S priority: 2 param_1: PRE-FLASH=YES req_1: INT ACQ FOR 18-19; req_2: CYCLE 2/ 16-19; req_3: GROUP 16-19 NO GAP; req_4: SEQ 16-19 comment_1: R IMAGE FOR INTERACTIVE ACQUISITION ! linenum: 18.000 targname: ^ config: HRS opmode: ACCUM aperture: 2.0 sp_element: G140L wavelength: 1304 num_exp: 2 time_per_exp: 272S priority: ^ param_1: STEP-PATT=5 ! linenum: 19.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: 1574 num_exp: 2 time_per_exp: 272S priority: ^ param_1: ^ ! linenum: 27.000 targname: HD36705 config: HRS opmode: ACQ/PEAKUP aperture: 2.0 sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 73.6S fluxnum_1: 1 priority: 1 req_1: ONBOARD ACQ FOR 28-32; req_2: CYCLE 3/ 27-32; req_3: COND IF TAC comment_1: STEP-TIME=1.6SEC comment_2: CENTER IN LSA AFTER NEW DEFCAL ! linenum: 28.000 targname: RST137B config: HRS opmode: IMAGE aperture: ^ sp_element: MIRROR-N2 num_exp: 1 time_per_exp: 96.8S priority: 1 req_1: COND IF TAC comment_1: TAKE MAP AFTER CENTERING comment_2: 200 MSEC INTEGRATIONS comment_3: LINE TO FORCE SLEW BEFORE WAVE ! linenum: 30.000 targname: WAVE config: ^ opmode: ACCUM aperture: SC2 sp_element: G160M wavelength: 1550 num_exp: 1 time_per_exp: 32S priority: ^ param_1: STEP-PATT=5 req_1: CALIB FOR 42 NO SLEW; req_2: SEQ 40-42 NON-INT; req_3: COND IF TAC ! linenum: 32.000 sequence_1: USE sequence_2: ROSSITER time_per_exp: X1 comment_1: PASS THROUGH OBSERVING SEQUENCE ! linenum: 35.000 targname: LHS429 config: WFC opmode: IMAGE aperture: W1 sp_element: F702W num_exp: 1 time_per_exp: 120S priority: 2 param_1: PRE-FLASH=YES req_1: INT ACQ FOR 36-37; req_2: CYCLE 4/ 35-37; req_3: GROUP 35-37 NO GAP; req_4: SEQ 35-37 comment_1: R IMAGE FOR INTERACTIVE ACQUISITION ! linenum: 36.000 sequence_1: USE sequence_2: DME targname: LHS429 num_exp: 1 time_per_exp: X1 priority: 2 ! linenum: 37.000 sequence_1: USE sequence_2: DME targname: LHS429 num_exp: 6 time_per_exp: X1 priority: 2 req_1: COND IF TAC ! linenum: 40.000 targname: LHS2065 config: WFC opmode: IMAGE aperture: W1 sp_element: F702W num_exp: 1 time_per_exp: 300S priority: 2 param_1: PRE-FLASH=YES req_1: INT ACQ FOR 41-42; req_2: CYCLE 4/ 40-42; req_3: GROUP 40-42 NO GAP; req_4: SEQ 40-42 comment_1: R IMAGE FOR INTERACTIVE ACQUISITION ! linenum: 41.000 sequence_1: USE sequence_2: DME targname: LHS2065 num_exp: 1 time_per_exp: X1 priority: 2 ! linenum: 42.000 sequence_1: USE sequence_2: DME targname: LHS2065 num_exp: 8 time_per_exp: X1 priority: 2 req_1: COND IF TAC ! ! end of exposure logsheet ! No scan data records found