Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..619w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, May 1983, p. 619-635. Research supported by the Sc
Astronomy and Astrophysics
Astronomy
12
Binary Stars, Stellar Spectra, Ultraviolet Spectra, Absorption Spectra, Iue, Line Spectra, Spectrum Analysis, Stellar Winds, Visible Spectrum
Scientific paper
High- and low-resolution IUE ultraviolet spectroscopic observations of the binary system HD 45166, previously classified as qWR + B8 V, obtained at several epochs are presented. The UV spectra show a photospheric absorption spectrum from highly ionized species like Fe v, which with the observation of B8 V absorptions in the visible, confirms the binary nature of the system. UV data obtained at different epochs show gross changes in the strengths of comparatively narrow emission lines in N IV, C III and He II. C IV 1550 shows a P-Cygni profile indicating a significant stellar wind from the hot object in the system, with v(infinity) of about 1200 km/s. An analysis of the UV and visible continuum, which shows no apparent epoch variations, yields the following parameters for the hot object: M(v) = -0.21, T(eff) = 60,000 K, log L/L(solar) = 3.84, R = 0.77 R(solar) and M = 0.5 M(solar). It is suggested that the hot stellar component may be an SdO rather than a qWR star. The cause of the observed variability in the emission lines remains an enigma.
Stickland David J.
Willis Alan J.
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