Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..813y&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.56, No.5, pp. 813-818
Astronomy and Astrophysics
Astronomy
4
Stars: Binaries, Stars: Flare, Stars: Individual (Hd 38563S), Stars: Magnetic Fields, X-Rays: Stars
Scientific paper
A report is made on the Chandra archival data analysis of NGC 2068, which is one of the nearest (˜ 400 pc) and X-ray active star-forming regions, with an estimated age of 105-6yr. The observation was made for 100ks. Using the wavdetect tool, 152 X-ray sources were detected, of which 52 had counterparts in the 2MASS survey. One of the brightest X-ray sources is apparently identified with a V = 10.42 late B-type main-sequence star, HD 38563S. During the observation, it exhibited two X-ray flares, with the 0.5-8.0keV luminosity reaching ˜ 1031.6 erg s-1. The flare X-rays evolved on a time scale of several hours, and showed a thermal spectrum of temperature of ˜ 5 keV. These results suggests that this star forms an active binary, although contamination by a T Tauri star also remains an alternative possibility.
Ezoe Yu-ichiro
Makishima Kazuo.
Yanagida Takayuki
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