X-rays and Winds in Massive Stars of Cygnus OB2

Details X-rays and Winds in Massive Stars of Cygnus OB2 X-rays and Winds in Massive Stars of Cygnus OB2

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..388..139a&link_type=abstract

Mass Loss from Stars and the Evolution of Stellar Clusters ASP Conference Series, Vol. 388, proceedings of the conference held 2

Astronomy and Astrophysics

Astronomy

Scientific paper

The X-ray properties and stellar-wind parameters of 26 OB type stars of the Cyg OB2 region are examined. Absorption corrected X-ray luminosities (Lx) were calculated fitting our data with thermal emission models. log(Lx)-log(Lbol) plane was constructed. Main-sequence (MS) stars are widely dispersed around the relation log(Lx/Lbol) ˜ -7(±1), while evolved ones (luminosity classes I, and III) tends to follow a power-law dependence: log Lx˜1.79(±0.29) log Lbol - 38.2(±11.7). We also test the correlation between Lx and the modified wind momentum W=mdotǐnf√ R for all OB stars of the region.

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