Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..361..533y&link_type=abstract
Active OB-Stars: Laboratories for Stellar and Circumstellar Physics, ASP Conference Series, Vol. 361, Proceedings of the confere
Physics
1
Scientific paper
The 100 ksec CHANDRA ACIS-I archival data of high mass star forming region (SFR) NGC 2264 were analyzed, and 285 X-ray sources were detected, with their luminosities ranging 5× 10^{28}˜ 10^{32} erg s^{-1}. Among them, two B type stars, HD 261902 (B8) and HD 47777 (B3), showed clear flare like time variations on a typical time scale of ˜ 5 hours, both peak X-ray luminosities reaching ˜ 10^{32} erg/s. In both cases, the time averaged flare spectra can be described by emission model involving two temperatures. The two stars are thus too X-ray luminous for their intermediate mass range, and the flare-like variation is inconsistent with the general lack of magnetic activities in normal B-type stars. These results suggest that some young B-type stars form magnetically active binaries, and can be regarded as much younger analogues of Algol.
Ezoe Yu-ichiro
Kawaharada Madoka
Kokubun Motohide
Makishima Kazuo.
Yanagida Takayuki
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