Observational clues for a role of circumstellar accretion in PMS x-ray activity - INSPIRE

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Observational clues for a role of circumstellar accretion in PMS x-ray activity

Ettore Flaccomio
(
- Palermo Observ.
)
,
G. Micela
(
- Palermo Observ.
)
,
Salvatore Sciortino
(
- Palermo Observ.
)

Oct, 2002

12 pages

Published in:

Astron.Astrophys. 397 (2003) 611-622

e-Print:

astro-ph/0210258 [astro-ph]

DOI:

10.1051/0004-6361:20021484

View in:

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Abstract: (arXiv)

We revisit the published analyses of ROSAT X-ray observations of the star forming regions NGC 2264 and Chamaeleon I (~3 and ~5 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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