Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011bsrsl..80..724s&link_type=abstract
Société Royale des Sciences de Liège, Bulletin, vol. 80, p. 724-728 (Proceedings of the 39th Liège Astrophysical Colloquium, hel
Other
3
Scientific paper
We report the preliminary results of the Suzaku observations of the W-R binary WR 140 (WC7+O5I). We executed the observations at four different epochs around periastron passage in Jan. 2009 to understand the W-R stellar wind as well as the wind-wind collision shocks. The total exposure was 210 ks. We detected hard X-ray excess in the HXD band (> 10 keV) for the first time from a W-R binary. Another notable discovery was a soft component which is less absorbed even by the dense wind. The spectra can be fitted by three different components; one is for the cool component with kT=0.1--0.6 keV, one for a dominant high-temperature component with kT ˜3 keV, and one for the hardest power-law component with the photon index of ˜2. As periastron approached, the column density of the high-temperature component increased, which can be explained as self-absorption by the W-R wind. The emission measure of the dominant, high-temperature component is not inversely proportional to the distance between the two stars.
Corcoran Michael
Dougherty Sean
Hamaguchi Kenji
Maeda Yoshitomo
Moffat Anthony
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