1980•Monthly Notices of the Royal Astronomical SocietyRequires access

HD 15570: a star intermediate between Of and WN7?

A. J. Willis, D. J. Stickland

Abstract

IUE ultraviolet observations of HD 15570, classified in the visible as O4f, show the presence of N IV] λ 1486 and He II λ 1640 strongly in emission; spectral characteristics which are signatures of WN stars rather than Of stars. A comparison of the UV spectra of this star with those of ζ Pup (O4f), HD 164794 (O4V) and HD93131 (WN7) suggests that HD 15570 may be intermediate in type between Of and WN7 and may represent an evolutionary link between these two stellar classes.

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Key concepts: Physics, Astrophysics, Stars, Spectral line, Star (game theory), O-type star, O-type main-sequence star, Astronomy