Long-term coherent variations in the WR system EZ Canis Majoris: the binary scenario revisited

Details Long-term coherent variations in the WR system EZ Canis Majoris: the binary scenario revisited Long-term coherent variations in the WR system EZ Canis Majoris: the binary scenario revisited

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..583g&link_type=abstract

Astronomy and Astrophysics, v.347, p.583-589 (1999)

Astronomy and Astrophysics

Astrophysics

11

Stars: Binaries: Spectroscopic, Stars: Wolf-Rayet, Stars: Variables: General, Stars: Individual: Hd 50896 = Ez Cma = Wr6

Scientific paper

An analysis of seven different spectroscopic and eight photometric sets of observations of the WN5 star HD 50896=EZ CMa, distributed over more than 15 years is used to refine the known 3.76 days period. The value of P = 3.7650 +/- 0.0001 d yields variations which have coherent phase-dependence. Although not conclusive, this coherence in the 3.7650 day periodic variations over such a long time revives scenarios in which HD 50896 consists of a binary system, a hypothesis that had been nearly completely discarded over the past few years. A binary scenario is not in contradiction with the presence of a non-spherically symmetric wind distribution or instabilities in the WR star's wind and, in fact, mechanisms such as these are probably responsible for the difficulty in having until now obtained a period which yields coherent variations. The low X-ray fluxes suggest that the possible companion may not be a collapsed object, or that the accretion process is inhibited. Table~3 available in electronic form only at the CDS via anonymous ftp to: cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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