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

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dc.creatorFlaccomio, E.
dc.creatorMicela, G.
dc.creatorSciortino, S.
dc.date2002-10-11
dc.date.accessioned2026-07-07T11:46:03Z
dc.date.available2026-07-07T11:46:03Z
dc.descriptionWe 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.
dc.description12 pages, 9 figures, accepted by A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0210258
dc.identifierhttp://arxiv.org/abs/astro-ph/0210258
dc.identifierAstron.Astrophys.397:611-622,2003
dc.identifierdoi:10.1051/0004-6361:20021484
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202088
dc.subjectAstrophysics
dc.titleObservational clues for a role of circumstellar accretion in PMS X-ray activity
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