| Journal: | Revista mexicana de astronomía y astrofísica |
| Database: | PERIÓDICA |
| System number: | 000226783 |
| ISSN: | 0185-1101 |
| Authors: | Koenigsberger, Gloria1 |
| Institutions: | 1Universidad Nacional Autónoma de México, Centro de Ciencias Físicas, Cuernavaca, Morelos. México |
| Year: | 2004 |
| Season: | Oct |
| Volumen: | 40 |
| Number: | 2 |
| Pages: | 107-135 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Descriptivo |
| Spanish abstract | Se presenta un análisis del sistema múltiple HD 5980 situado en la Nube Menor de Magallanes y de los efectos de la colisión entre los vientos, y se discute su posible ubicación en el diagrama H-R. Los datos analizados comprenden el período 1979-2002 y son consistentes con la clasificación original WNE de la estrella B, la compañera cercana de la estrella A que en 1993-1994 tuvo una erupción. La evolución del sistema probablemente se pueda describir utilizando trazas evolutivas que incluyan los efectos de rotación y/o el intercambio de masa |
| English abstract | 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 P Cygni absorption lines imply that the wind speed of star A is 1700–2200 km s-1 and that of star B is 2600–3100 km s-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+starB 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 |
| Disciplines: | Física y astronomía |
| Keyword: | Astronomía, Estrellas binarias, Nube Menor de Magallanes, Viento |
| Keyword: | Physics and astronomy, Astronomy, Binary stars, Small magellanic cloud, Wind |
| Full text: | Texto completo (Ver PDF) |
