On the Nature of the LBV/WR Eclipsing Binary System HD 5980
HD 5980 is a multiple star system in the Small Magellanic Cloud that underwenta 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 pap...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57140201 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57140201 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas RAYET OUTFLOWS STARS: WOLF STARS: WINDS STARS: BINARIES (ECLIPSING) |
| Sumario: | HD 5980 is a multiple star system in the Small Magellanic Cloud that underwenta 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 coverthe period 1979-2002, and support the WNE classification of star B. The orbitalphase-dependent variations of ultraviolet P Cygni absorption lines imply that thewind speed of star A is 1700{2200 km s1 and that of star B is 2600{3100 km s1.These allow an estimate of the wind-wind collision (wwc) shock cone geometry andline profiles from the wwc region. Given the assumed mass-loss rates, only a smallfraction of the observed emission line profies may originate in the wwc region. Thestar A+star B binary pair is likely the result of evolution with mass transfer and/orevolution with rapid rotation, and provides a magnificent opportunity for studyingthe processes that occur in massive multiple systems at the stages of stellarevolution just prior to the supernova event. |
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