The variable emission-line spectrum of HD 50896 - WN5

Details The variable emission-line spectrum of HD 50896 - WN5 The variable emission-line spectrum of HD 50896 - WN5

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..804e&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Dec. 1979-Jan. 1980, p. 804-816. Research supported by the Universit

Astronomy and Astrophysics

Astronomy

26

Emission Spectra, Hot Stars, Stellar Spectra, Variable Stars, Binary Stars, Radial Velocity, Stellar Mass, Wolf-Rayet Stars

Scientific paper

HD 50896 is a WN5 star whose emission-line profiles vary considerably in shape. Night-to-night changes are always present, hourly changes are usually observable, and variations are occasionally detected with a time scale of ten minutes. The radial velocity of the star has a maximum range of variation of 50 km/s. If the variability is due to binary motion, the Wolf-Rayet star has a maximum mass of 10.2 solar masses, while the companion is no larger than 1.1 solar masses. Evolutionary arguments demand that the secondary be a neutron star. The X-ray luminosity of an exposed neutron star in the Wolf-Rayet stellar wind would have been detected by the Uhuru satellite. The lack of such a detection, and the derived dimension of the orbit, imply that the neutron star, if it exists, is buried in the expanding envelope of the Wolf-Rayet primary.

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