The Erupting Wolf-Rayet Binary HD 5980 in the Small Magellanic Cloud: Spectral Transition From B1.5Ia+ to WN6 and the Accompanying Light Curve.
In this paper we analyze the high dispersion IUE spectra of the erupting Wolf-Rayet system HD 5980 obtained shortly after the maximum in the optical light curve and one year later. We show that the earliest spectrum has features which are characteristic of B1.5Ia(+) spectra. Subsequent spectra indicate a photosphere which is gradually increasing its Teff, containing Fe IV and Fe V absorption features, and becoming finally a WN6. We also present a UV light curve at two wavelength bands (1300A and 1850A) covering a year after maximum in the eruption, where both eclipses of the 19.3 day orbit are evident.
|Main Author:||Koenigsberger, Gloria.|
|Other Authors:||Shore, Steve., Guinan, Ed., Auer, Lawrence.|