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http://hdl.handle.net/20.500.12386/23087
Titolo: | X-Ray Emission from Massive Stars in Cyg OB2 | Autori: | Rauw, G. Nazé, Y. Wright, N. J. Drake, J. J. GUARCELLO, Mario Giuseppe Prinja, R. K. Peck, L. W. Albacete Colombo, J. F. Herrero, A. Kobulnicky, H. A. SCIORTINO, Salvatore Vink, J. S. |
Data pubblicazione: | 2015 | Rivista: | THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | Numero: | 221 | Fascicolo: | 1 | Da pagina:: | 1 | Abstract: | We report on the analysis of the Chandra-ACIS data of O, B, and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars, and 3 WR-stars are analyzed and for the brighter sources, the epoch dependence of the X-ray fluxes is investigated. The O-stars in Cyg OB2 follow a well-defined scaling relation between their X-ray and bolometric luminosities: {log}\\frac{{L}<SUB>{{X</SUB>}}}{{L}<SUB>{bol</SUB>}}=-7.2+/- 0.2. This relation is in excellent agreement with the one previously derived for the Carina OB1 association. Except for the brightest O-star binaries, there is no general X-ray overluminosity due to colliding winds in O-star binaries. Roughly half of the known B-stars in the surveyed field are detected, but they fail to display a clear relationship between L<SUB>X</SUB> and L<SUB>bol</SUB>. Out of the three WR stars in Cyg OB2, probably only WR 144 is itself responsible for the observed level of X-ray emission, at a very low {log}\\frac{{L}<SUB>{{X</SUB>}}}{{L}<SUB>{bol</SUB>}}=-8.8+/- 0.2. The X-ray emission of the other two WR-stars (WR 145 and 146) is most probably due to their O-type companion along with a moderate contribution from a wind-wind interaction zone. | Acknowledgments: | The Liège team acknowledges support from Belspo through an XMM PRODEX contract, from the FRS/FNRS and from an ARC grant for Concerted Research Actions, financed by the Federation Wallonia-Brussels. N.J.W. was supported by a Royal Astronomical Society research fellowship. Facilities: CXO , XMM . | URI: | http://hdl.handle.net/20.500.12386/23087 | URL: | https://iopscience.iop.org/article/10.1088/0067-0049/221/1/1 https://arxiv.org/pdf/1401.8098 |
ISSN: | 0067-0049 | DOI: | 10.1088/0067-0049/221/1/1 | Bibcode ADS: | 2015ApJS..221....1R | Fulltext: | open |
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