Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50..465y&link_type=abstract
Publications of the Astronomical Society of Japan, v.50, p.465-474.
Astronomy and Astrophysics
Astronomy
15
Interstellar: Individual (Chamaeleon Ii Dark Cloud), Stars: Pre-Main-Sequence, X-Rays: Stars, X-Rays: Spectra
Scientific paper
ASCA results of eight X-ray sources in the Chamaeleon II dark cloud are presented. Six sources were identified as low-mass young stellar objects, either Class II--III sources or T Tauri stars with X-ray temperatures and luminosities in the range of 0.8--3 keV and 10(29.9) --10(31.1) erg s(-1) , respectively. Two of them showed time variability: one with typical flare profile and the other with a light curve showing fast-rise and gradual decay. These variable sources exhibited a higher temperature than did those of the other sources with less time variability. We found a high-temperature, time-variable, and moderately absorbed X-ray source which has no cataloged counterpart at any other wavelength. We also found hard X-rays at the position of a Herbig Ae candidate with an extremely large N_H of 2times 10(23) H cm(-2) , one order of magnitude higher than that estimated from the optical extinction. The origin of the X-rays, including these two sources, are discussed.
Hamaguchi Kenji
Koyama Katsuji
Murakami Hiroshi
Yamauchi Shigeo
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