2015A&A...581A..49C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST01:26:54

2015A&A...581A..49C - Astronomy and Astrophysics, volume 581A, 49-49 (2015/9-1)

A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a.

COLLADO A., GAMEN R., BARBA R.H. and MORRELL N.

Abstract (from CDS):

Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15±5M and 30±4M, respectively. The equivalent width of the Heii λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - stars: Wolf-Rayet - stars: individual: WR 68a - stars: fundamental parameters

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 359 1
2 WR 35a WR* 11 00 24.3375689175 -59 59 35.644346316   14.78 13.92 13.10 11.83 WN6h 13 0
3 WR 62a WR* 14 32 37.6993537332 -61 29 54.125971120   14.49 13.06 12.69   WN5+O5.5/6 7 0
4 WR 68a WR* 15 23 16.6169678161 -57 44 19.783449801           WN6+O5.5/6 4 0
5 HD 320102 WR* 17 36 53.6231930035 -34 02 36.780841955 11.51 11.60 10.72 10.65   WN4+O5/7V 85 0
6 HD 193576 WR* 20 19 32.4230196684 +38 43 53.958209968 8.15 8.53 8.00     WN5+O6II-V 684 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-01:26:54

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