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New observational results on the colliding wind WR+O binary WR 30a

  • Eric Gosset (a1), Pierre Royer (a1), Gregor Rauw (a1), Jean Manfroid (a1) and Jean-Marie Vreux (a1)...

Extract

WR30a (MS 4) was first suspected as a possible Wolf-Rayet star by McConnell & Sanduleak (1970) during a deep objective-prism survey performed around the Carina Nebula region. From subsequent studies, the spectrum turned out to be composite, with a WR component classified W04 (or alternatively WC4, W05 and WC3) and an 0 component classified 04. Niemela (1995) reported the first, and up-to-now unique, radial velocity study for that star. She noticed large variations of CIV λ4658 from night to night, suggesting that WR30a might be a short period binary. A plot of the C IV emission-line velocities versus the He II absorption ones clearly indicates that they are exhibiting opposite binary motions. The apparent velocity amplitudes imply a rather low mass ratio Mwo4/Mo4 = 0.15, although the radial velocities of the C IV line could be distorted due to line-profile variations.

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References

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McConnell, D.J., Sanduleak, N. 1970, PASP 82, 80
Niemela, V.S. 1995, in: van der Hucht, K.A. & Williams, P.M. (eds.), Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution, Proc IAU Symposium No. 163 (Dordrecht: Kluwer), 223

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