Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...445.1093p&link_type=abstract
Astronomy and Astrophysics, Volume 445, Issue 3, 2006, pp.1093-1097
Astronomy and Astrophysics
Astrophysics
15
X-Rays: Stars, Stars: Wolf-Rayet, Stars: Individual: Wr 25, Stars: Winds, Outflows, Stars: Binaries: General
Scientific paper
The Wolf-Rayet star WR 25 in the Carina Nebula is a surprisingly bright X-ray source, and amongst the brightest WR stars in X-rays. It is a suspected binary star, though its binary nature has been a matter of controversy. We report here observations of WR 25 from the XMM-Newton archive which showed an increase in X-ray luminosity of more than a factor of two. The X-ray absorption also increased. Such a large change in X-ray output is unknown in single massive stars, though large changes in X-ray brightness are seen in binaries. The most likely explanation of the observed X-ray variability is as a result of colliding-wind emission in a moderately eccentric binary with a period of about 4 years. The next periastron passage is expected in 2007. The X-ray spectrum is similar to that of the archetype colliding-wind binary WR 140.
Corcoran Michael F.
Pollock Andy M. T.
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