2008ApJ...683..449B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.12CEST15:48:05

2008ApJ...683..449B - Astrophys. J., 683, 449-465 (2008/August-2)

Time-resolved FUSE spectroscopy of the LMC WC + O binaries Br 22 and Br 32.

BOISVERT P., MARCHENKO S.V., ST-LOUIS N. and MOFFAT A.F.J.

Abstract (from CDS):

Using the Far Ultraviolet Spectroscopic Explorer satellite, we obtained series of spectra for two of the three known WC + O binaries in the LMC, Br 22, and Br 32 (HD 36521). Compared to Br 22, we detect a higher ratio of C IV to He II lines in Br 32, which could indicate a more advanced evolutionary stage for the latter. The orbit of the O star in Br 32 has been determined from its P V absorption lines. We find that continuum fluxes in both systems are substantially diluted by a third-light source. The maximum extension of the black absorption troughs in P Cygni profiles provides the terminal velocities of the WC winds: 3775±125 km/s for Br 22 and 4400±150 km/s for Br 32. From the phase-dependent displacements of the blue absorption edges of prominent emission lines we estimate the half-opening angles of the wind-wind collision zones and their Coriolis deflections. In both binaries we fitted, via iterative procedure, the phase-dependent changes in the O VI λ1032-1037 and C III λ1175 profiles as a function of the wind, stellar, and orbital parameters. This allowed us to isolate the excess emission produced in the wind-wind collision zone and reproduce profile changes caused by atmospheric eclipses. A strong extra emission component is observed in Br 22 (P=14.9 days), while it is negligible in Br 32 (P=1.9 days).

Abstract Copyright:

Journal keyword(s): Line: Profiles - stars: individual (Br 22) - stars: individual (Br 32) - Stars: Wolf-Rayet - Techniques: Spectroscopic

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9792 1
2 LIN 547 WR* 01 31 04.1366633984 -73 25 03.786377386   12.75 12.90     WO4+O4V 92 0
3 HD 32402 WR* 04 57 24.0824729521 -68 23 57.122171327   12.53 12.69 13.24   WC 70 0
4 SK -70 69 * 05 05 18.6719268373 -70 25 49.876064190 12.586 13.616 13.854   14.074 O3V(f) 39 0
5 SK -67 69 * 05 14 20.0724897322 -67 08 03.171856399 11.950 13.012 13.040   13.330 O3III 24 0
6 HD 35517 WR* 05 19 16.3520500120 -69 39 20.008292786 11.193 11.754 11.58 12.36 11.953 WC4+O5/6III/V+O 82 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15354 1
8 SK -67 101 * 05 25 56.2418446809 -67 30 28.813100962   12.46 12.63     O8II((f)) 30 1
9 HD 36402 WR* 05 26 03.9637508160 -67 29 57.087055949   11.25 11.621 11.65   (WC) 134 0
10 HD 36521 WR* 05 26 30.2634371012 -68 50 27.502484139   12.156 12.317 12.529   WC4+O6III/V+O 81 0
11 BI 173 * 05 27 09.9443110675 -69 07 56.453557872 11.85 12.86 13.00     O8III 25 0
12 SK -66 100 * 05 27 45.4472881165 -66 55 15.296369854 12.227 12.976 13.204   13.501 O6II(f) 44 0
13 HD 37026 WR* 05 30 12.1637558730 -67 26 08.329160840 12.853 13.16 13.53 13.56 13.856 WC 68 0
14 HD 269676 ** 05 31 15.654 -71 04 09.69 11.134 11.42 11.55 12.06 12.191 O6+O9: 75 0
15 HD 37680 WR* 05 34 19.2497853756 -69 45 10.298101295 12.807 12.98 13.25 13.21 13.490 WC 67 1
16 HD 269810 Em* 05 35 13.8987303206 -67 33 27.540351680   12.08 12.22 12.53   O3III(f*) 100 0
17 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 854 0
18 HD 193576 WR* 20 19 32.4230196684 +38 43 53.958209968 8.15 8.53 8.00     WN5+O6II-V 687 0

    Equat.    Gal    SGal    Ecl

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