Wolf-Rayet stars in the Magellanic Clouds. IV - The extraordinarily broad-lined, triple system R130 in the Large Magellanic Cloud

Details Wolf-Rayet stars in the Magellanic Clouds. IV - The extraordinarily broad-lined, triple system R130 in the Large Magellanic Cloud Wolf-Rayet stars in the Magellanic Clouds. IV - The extraordinarily broad-lined, triple system R130 in the Large Magellanic Cloud

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..714m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 714-720. NSERC-DFG-supported research.

Astronomy and Astrophysics

Astrophysics

16

Magellanic Clouds, Stellar Spectra, Triple Stars, Wolf-Rayet Stars, X Ray Sources, B Stars, Binary Stars, Orbital Elements, Radial Velocity, Stellar Orbits

Scientific paper

R130 is a luminous, hot star with a dual spectrum: WN6 + B 1 Ia. The Wolf-Rayet component has an extraordinarily fast wind for its subtype. The strongly diluted emission line of He II 4686 Å from the W - R star reveals a 4 day radial velocity orbit of moderate amplitude (K ≍ 200 km s-1) while the absorption lines of the B supergiant yield essentially zero amplitude (K = 7 ± 9 km s-1). Hence, unless one of the stars has a very peculiar mass, the WN6 star must be orbiting a third, unseen star, which is most likely a normal luminosity O star of moderate mass, similar to the mass of the WN6 star. This is reminiscent of the galactic WC6 (+O) + O9.7 lab system θ Mus. Although R130 was originally identified with an Einstein Observatory IPC source (and thus R130 would be exceedingly bright in medium-soft X-rays), later HRI observations by Pollock fail to confirm this with certainty.

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