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 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:
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RA (2000) DE Designation(s) (files)
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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)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 23 Observed and derived parameters for the
components of Breysacher 73
table2.dat 83 38 Observed and derived parameters for the
components of NGC 2044 West
table3.dat 82 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
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Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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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)
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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: in Simbad
* In table3: in Simbad
* In table4: 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 1992A&AS...92..729S) or
Heydari-Malayeri et al. (1993A&A...278...11H 1993A&A...278...11H)
Note (4): Alternative IDs refer to:
* Table1:
Tes = Testor et al. (1988Msngr..54...43T 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 1995A&A...302..327S)
H-M = Heydari-Malayeri et al. (1983A&A...118..116H 1983A&A...118..116H)
with arabic numerals added here to the letters to denote
subsequently resolved components.
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History:
From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 30-Nov-1999