On the Nature of the LBV/WR Eclipsing Binary System HD 5980

Details On the Nature of the LBV/WR Eclipsing Binary System HD 5980 On the Nature of the LBV/WR Eclipsing Binary System HD 5980

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rmxaa..40..107k&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 40, pp. 107-135 (2004) (http://www.astroscu.unam.mx/~rmaa/)

Astronomy and Astrophysics

Astronomy

22

Stars: Binaries (Eclipsing), Stars: Individual (Hd980), Stars: Winds, Outflows, Stars: Wolf-Rayet, Stars: Variables (Luminous Blue Variables)

Scientific paper

HD 5980 is a multiple star system in the Small Magellanic Cloud that underwent a luminous blue variable-like eruption in 1993-1994. The erupting star (star A) forms part of a close eclipsing binary whose companion's (star B) Wolf-Rayet nature has recently been questioned. The data analyzed in this paper cover the period 1979-2002, and support the WNE classification of star B. The orbital phase-dependent variations of ultraviolet Pabsorption lines imply that the wind speed of star A is 1700-2200s-1 and that of star B is 2600-3100s-1. These allow an estimate of the wind-wind collision (wwc) shock cone geometry and line profiles from the wwc region. Given the assumed mass-loss rates, only a small fraction of the observed emission line profiles may originate in the wwc region. The star A+star B binary pair is likely the result of evolution with mass transfer and/or evolution with rapid rotation, and provides a magnificent opportunity for studying the processes that occur in massive multiple systems at the stages of stellar evolution just prior to the supernova event.

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