1997A&A...328..219S


Query : 1997A&A...328..219S

1997A&A...328..219S - Astronomy and Astrophysics, volume 328, 219-228 (1997/12-1)

The orbital motion of γ2 Velorum.

SCHMUTZ W., SCHWEICKHARDT J., STAHL O., WOLF B., DUMM T., GAENG T., JANKOVICS I., KAUFER A., LEHMANN H., MANDEL H., PEITZ J. and RIVINIUS T.

Abstract (from CDS):

We analyze the orbital motion of γ2 Velorum based on high resolution optical spectra obtained in 1995 and 1996. By combining our data with values from the literature we find a period P=78.53±0.01d. We determine radial velocity semi-amplitudes KWR=122±2km/s and KO=38.4±2km/s for the Wolf-Rayet star and the O star, respectively. The given errors are the standard deviations of the results from individual lines. The inclination of the system is i=65°. This result is obtained by combining MOsin3i from the orbital analysis with the mass MO=29M, obtained from its luminosity and stellar evolution tracks. The mass of the Wolf-Rayet component is MWR=9M. Our O star velocity curve disagrees by 15σ from a previously published result. We have identified the reason for the disagreement in the failure to correct for the WR emission that affects the measurements of the absorption line centers. The correction could have introduced systematic errors that may be larger than the given precision of the amplitudes. However, we can set an upper limit of KO<50km/s from uncorrected measurements. This yields an upper limit for the Wolf-Rayet mass of MWR<12M. We find systematic phase-shifts between the velocity curves of some emission lines. We also observe that some (but not all) emission lines deviate significantly in the 1995 data set from the line's orbital solution defined by the 1996 observations. These phenomena may indicate that the radial velocities of the emission lines could be subject to systematic distortions and that the errors of the orbital motion are larger than the internal precision given here.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - stars: early-type - stars: fundamental parameters - stars: individual: γ2 Vel (HD 68273) - stars: Wolf-Rayet

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 867 0
2 * tet Mus WR* 13 08 07.1531705448 -65 18 21.679426548 4.71 5.50 5.53 5.44 5.40 WC5+B0III 308 0
3 HD 152270 WR* 16 54 19.6991292072 -41 49 11.531710092 6.26 6.80 6.597 6.72 6.39 WC7+O5-8 296 0
4 HD 190918 WR* 20 05 57.3244526328 +35 47 18.150756792 6.11 6.88 6.75     WN5+O9I 356 0

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2022.05.20-20:18:26

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