SIMBAD references

2001MNRAS.327..435G - Mon. Not. R. Astron. Soc., 327, 435-451 (2001/October-3)

A first detailed study of the colliding wind WR+O binary WR 30a.


Abstract (from CDS):

We present a detailed, extensive investigation of the photometric and spectroscopic behaviour of WR 30a. This star is definitely a binary system with a period around 4.6d. We propose the value P=4.619d (sigma=0.002d). The identification of the components as WO4+O5((f)) indicates a massive evolved binary system; the O5 component is a main-sequence or, more likely, a giant star. The radial velocities of the O star yield a circular orbit with an amplitude KO=29.9 (sigma=2.1)km.s–1 and a mass function of 0.013 (sigma=0.003)Msolar. The spectrum of WR 30a exhibits strong profile variations of the broad emission lines that are phase-locked with the orbital period. We report the detection of the orbital motion of the WO component with KWO=189km.s-1, but this should be confirmed by further observations. If correct, it implies a mass ratio MWO/MO=0.16. The star exhibits sinusoidal light variations of amplitude 0.024mag peak-to-peak with the minimum of light occurring slightly after the conjunction with the O star in front. On the basis of the phase-locked profile variations of the Civ λ4658 blend in the spectrum of the WO, we conclude that a wind-wind collision phenomenon is present in the system. We discuss some possibilities for the geometry of the interaction region.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): binaries: spectroscopic - stars: individual: WR 30a - stars: mass-loss - stars: Wolf-Rayet

Nomenclature: Fig.1: [GRR2001] A (Nos A-H).

Simbad objects: 13

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