SIMBAD references

1997NewA....2..245V - New Astronomy, 2, 245-250 (1997/August-0)

The Hipparcos distance determination of the Wolf-Rayet system gamma 2 Velorum (WC8+O) and its ramifications.

VAN DER HUCHT K.A., SCHRIJVER H., STENHOLM B., LUNDSTROM I., MOFFAT A.F.J., MARCHENKO S.V., SEGGEWISS W., SETIA GUNAWAN D.Y.A., SUTANTYO W., VAN DEN HEUVEL E.P.J., DE CUYPER J.-P. and GOMEZ A.E.

Abstract (from CDS):

Hipparcos parallax measurements give a distance to the Wolf-Rayet WC8+O spectroscopic binary gamma^2 Vel of d=258^+41_-31 pc and a distance to the O4I(n)f star zeta Pup of d=429^+120_-77 pc. Adopting for gamma^2 Vel an interstellar extinction of A_v=0.06 mag, this implies an absolute magnitude M_v=-5.4 mag for the WC8+O binary system. Given that the binary components have a magnitude difference Delta m=1.4 mag, we derive M_v(WC8)=-3.7 and M_V(O)=-5.0 mag. The latter indicates an O8.5III rather than an O9I companion, as was adopted during the last 25 years. Apparently gamma^2 Vel is not a member of, but a foreground object before the open cluster Cr 173 and the association Vel OB2. Given a re-assessment of the distance of the Gum Nebula, gamma^2 Vel is still one of its ionizing sources, while zeta Pup appears to be located at the back of the Gum Nebula. Consequences of the Hipparcos distance determination of gamma^2 Vel for its mass, mass loss rate, luminosities at various wavelengths, and, briefly, its association with the Gum Nebula, are discussed.

Abstract Copyright:

Journal keyword(s): Binaries: spectroscopic - Stars: distances - Stars: fundamental parameters - Stars: individual: gam02 Vel - Stars: mass-loss - Stars: Wolf-Rayet

Status at CDS:  

Simbad objects: 7

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