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J/AJ/118/1684       UBV photometry of 4 LMC compact OB groups  (Walborn+, 1999)

HST/FOS spatially resolved spectral classification of compact OB groups in the Large Magellanic Cloud. Walborn N.R., Drissen L., Parker J.W., Saha A., MacKenty J.W., White R.L. <Astron. J. 118, 1684 (1999)> =1999AJ....118.1684W
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, UBV Keywords: binaries: close - Magellanic Clouds - open clusters and associations: general - stars: early-type - stars: fundamental parameters - stars: Wolf-Rayet Abstract: Blue-violet spectrograms of individual components in four compact OB groups of the Large Magellanic Cloud, obtained with the Hubble Space Telescope (HST) Faint Object Spectrograph (FOS), are presented and discussed. Two of the massive multiple systems are in the 30 Doradus periphery, while the other two represent the core and the peripheral, triggered associations in the giant shell H II region Henize N11. Uncontaminated spectrograms of three Wolf-Rayet and two very early Of components have been obtained for the first time; they can be observed only as composites with their close companions from the ground. Many of the companions have also been observed separately with the HST FOS, and several are of special interest in their own right. These observations provide information on the initial masses and ages of the peculiar objects, and on the evolutionary relationships among different spectral categories within the presumably coeval systems. Objects: ----------------------------------------------------------------- RA (2000) DE Designation(s) (files) ----------------------------------------------------------------- 05 37 42 -69 09 00 Brey 73 = LMC AB 10 (table1.dat) 05 35 58.9 -69 11 47 NGC 2044 West = HDE 269828 (table2.dat) 04 57 08.8 -66 23 25 LH 10-3209 = PGMW 3209 (table3.dat) 04 56 34.0 -66 28 24 HD 32228 = Brey 9 (table4.dat) ----------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 91 23 Observed and derived parameters for the components of Breysacher 73 table2.dat 91 38 Observed and derived parameters for the components of NGC 2044 West table3.dat 91 6 Observed and derived parameters for the components of LH 10-3209 table4.dat 91 71 Observed and derived parameters for the components of HD 32228
Byte-by-byte Description of file: table?.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Sequential number (1) 4- 9 F6.2 pix Xpos X position (1) 11- 16 F6.2 pix Ypos Y position (1) 18- 22 F5.2 mag Vmag HST/WFPC F569W V magnitude 23 A1 --- n_Vmag [e] discrepant photometry (2) 24- 28 F5.2 mag B-V ? B-V colour index (F439W-F569W) 30- 34 F5.2 mag U-B ? U-B colour index (F336W-F439W) 36- 40 F5.2 mag E(B-V) ? B-V colour excess 41 A1 --- n_E(B-V) [ce] discrepant photometry (2) 42- 46 F5.3 [K] logTe ? Effective temperature 48- 53 F6.2 mag Mbol ? Bolometric magnitude 55- 59 F5.2 mag BC ? Bolometric correction 61- 75 A15 --- SpType MK spectral type (3) 76 A1 --- n_SpType [d] Note (3) 77- 91 A15 --- ID Alternate ID (4)
Note (1): Running number and detector coordinates from the present photometry, to be presented in full by Parker et al. in a subsequent paper. * In table1: <Brey 73 NN> in Simbad * In table2: <NGC 2044W NN> in Simbad * In table3: <LH 10-3209 NN> in Simbad * In table4: <HD 32228 NN> in Simbad Note (2): Notes as follows: c = The colors for these components were discrepant, so the average color excess of the other spectroscopically classified components was adopted instead e = The photometry for this component was discrepant, so the magnitude difference from component C in the V deconvolution and the average color excess of the other components were adopted for it instead. Note (3): Spectroscopy from HST Faint Object Spectrograph, unless d = Spectral type from Schild & Testor (1992A&AS...92..729S) or Heydari-Malayeri et al. (1993A&A...278...11H) Note (4): Alternative IDs refer to: * Table1: Tes = Testor et al. (1988Msngr..54...43T) with letters added here to the numbers to denote subsequently resolved components. * Table2: H-M = Heydari-Malayeri et al. (1993 A&A...278...11H) with letters added here to the numbers to denote subsequently resolved components. * Table3: See fig. 9 of the paper * Table4: Sch = Schertl et al. (1995A&A...302..327S) H-M = Heydari-Malayeri et al. (1983A&A...118..116H) with arabic numerals added here to the letters to denote subsequently resolved components.
History: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 30-Nov-1999
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