Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..437n&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.437-446.
Astronomy and Astrophysics
Astronomy
7
Galaxy: Open Clusters And Associations: Individual (Ngc 2264), Stars: Pre, Main-Sequence, Stars: X-Rays, X-Rays: Sources, X-Rays: Spectra
Scientific paper
We have made ASCA observations of the molecular cloud associated with NGC 2264, and detected nine and five sources in the soft and hard X-ray band images, respectively. Most of them are identified with known pre-main-sequence stars or protostellar objects. Two Class I sources with intermediate luminosities and one Class II source associated with molecular outflow are promising candidates for X-ray emitters. An optically thin hot-plasma model with two components can reproduce the GIS X-ray spectra, including both of the Class I sources. The hard X-rays probably arise from these Class I sources, and are intrinsically very luminous, >1032 erg s-1 in the 0.7-10.0 keV energy band, and their luminosities lie between low-mass Class I sources and that of the W 3 massive core region. Since near-infrared survey data reveal that Class I sources are surrounded by embedded young clusters, the soft X-ray components could be explained by aggregates of low-mass pre-main-sequence stars.
Nakano Makoto
Ogura Katsuo
Sugitani Koji
Yamauchi Shigeo
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