The first orbital solution for the massive colliding-wind binary HD 93162 (=WR 25)
| Autor: | Hugues Sana, Rodolfo H. Barbá, Yaël Nazé, Grégor Rauw, N. I. Morrell, Virpi S. Niemela, G. R. Solivella, Roberto Claudio Gamen, E. Gosset |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Ciencias Astronómicas
FOS: Physical sciences Binary number Astrophysics Star (graph theory) Binary stars Stars: individual: HD 93162 binaries : spectroscopic [stars] symbols.namesake Stars: binaries: spectroscopic Stars: Wolf-Rayet Astrophysics::Solar and Stellar Astrophysics Binary system Einstein individual: HD 93162 [Stars] Physics Colliding-wind binary Numerical analysis Astrophysics (astro-ph) individual : HD 93162 [stars] Astronomy and Astrophysics Wolf rayet stars Wolf-Rayet [Stars] Data set binaries: spectroscopic [Stars] Space and Planetary Science HD 93162 (estrella) symbols Satellite Astrophysics::Earth and Planetary Astrophysics Spectroscopic binaries |
| Zdroj: | NASA Astrophysics Data System ASTRONOMY & ASTROPHYSICS Artículos CONICYT CONICYT Chile instacron:CONICYT Scopus-Elsevier SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | Context. Since the discovery, with the EINSTEIN satellite, of strong X-ray emission associated with HD 93162 (≡WR 25), this object has been predicted to be a colliding-wind binary system. However, radial-velocity variations that would prove the suspected binary nature have yet to be found. Aims. We spectroscopically monitored this object to investigate its possible variability to address this discordance. Methods. We compiled the largest available radial-velocity data set for this star to look for variations that might be due to binary motion. We derived radial velocities from spectroscopic data acquired mainly between 1994 and 2006, and searched these radial velocities for periodicities using different numerical methods. Results. For the first time, periodic radial-velocity variations are detected. Our analysis definitively shows that the Wolf-Rayet star WR 25 is an eccentric binary system with a probable period of about 208 days. Facultad de Ciencias Astronómicas y Geofísicas |
| Databáze: | OpenAIRE |
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