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Rapid Ultraviolet Spectral Variations in HD 50896 (WN5+?)

Published online by Cambridge University Press:  04 August 2017

A J Willis ,
I D Howarth ,
P S Conti  and
C D Garmany
A J Willis
Affiliation:
Department of Physics & Astronomy, UCL, London, UK
I D Howarth
Affiliation:
Department of Physics & Astronomy, UCL, London, UK
P S Conti
Affiliation:
JILA, University of Colorado, Boulder, Colorado, USA
C D Garmany
Affiliation:
JILA, University of Colorado, Boulder, Colorado, USA

Extract

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HD 50896 has become one of the most promising candidate WR+collapsar systems (Moffat 1982) exhibiting optical light, RV and polarisation variations with a 3d.763 period (cf Firmani et al. 1980) yet direct evidence for its postulated n.s. component is lacking. UV spectra of analogous OB X-ray binaries show P-Cygni profile changes as a function of binary phase which are well understood in terms of anisotropic wind ionisation caused by X-ray emission from the accreting n.s. - the Hatchett & McCray (1976) effect. Observations of such UV variability in WR+c candidates with a clear phase dependence would thus provide good evidence for any n.s. companion. To this end we have obtained IUE spectra of HD 50896 in sequential NASA/VILSPA shifts over 6 consecutive days in 1983, together with complementary IUE data secured at various epochs during 1978–82, to search for the Hatchett & McCray effect in this star.

Type
Poster Papers 2
Information
Symposium - International Astronomical Union , Volume 116: Luminous Stars and Associations in Galaxies , 1986 , pp. 259 - 260
Copyright
Copyright © Reidel 1986 

References

Hatchett, S.P., McCray, R., 1976, ApJ., 211, 552 CrossRefGoogle Scholar
Firmani, C., et al., 1980, ApJ., 239, 604 CrossRefGoogle Scholar
Moffat, A., 1982, in Proc. IAU Symp. No.99 (eds. de Loore, & Willis, ), 263 CrossRefGoogle Scholar