期刊
ASTRONOMY & ASTROPHYSICS
卷 397, 期 2, 页码 611-621出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20021484
关键词
stars : pre-main sequence; X-rays : stars; accretion, accretion disks; open clusters and associations : individual : Orion Nebula Cluster, NGC 2264, Chamaeleon I
We revisit the published analyses of ROSAT X-ray observations of the star forming regions NGC 2264 and Chamaeleon I (similar to3 and similar to5 Myr old respectively) in the light of newly published optical data. At odds with previous results on Chamaeleon I members, we find that low mass stars in both regions have near-saturated emission levels. Similarly to what previously found in the Orion Nebula Cluster, Weak Line T-Tauri Stars in NGC 2264 and in the Chamaeleon I cloud have higher X-ray activity levels respect to Classical T Tauri Stars, arguing in favor of a role of the disk and/or accretion in determining X-ray emission.
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