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Paper: CHANDRA Observations of OB stars in the Cygnus OB2 Association
Volume: 361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics
Page: 530
Authors: Yanagida, T.; Ezoe, Y.; Kawaharada, M.; Kokubun, M.; Makishima, K.
Abstract: A report is made on the analysis of two CHANDRA archival data of the Cygnus OB2 association, which is one of the nearest (∼ 1.7 kpc) massive star forming regions. Using the wavdetect tool, 559 and 171 X-ray sources were detected. Among them, two sources show hard spectra which are represented by powerlaw of photon index ∼ 1.2 or thin thermal plasma emission of kT ∼ 10 keV. They do not have counterparts in other wavelengths, and one of them is located in the center of three possible OB stars, arranged in a triangle with a separation of ∼ 0.05 pc. This suggests that the X-ray emission of this particular object is powered by a collision among winds from the three stars.
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