2003A&A...397..611F


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET10:36:56

2003A&A...397..611F - Astronomy and Astrophysics, volume 397, 611-621 (2003/1-2)

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

FLACCOMIO E., MICELA G. and SCIORTINO S.

Abstract (from CDS):

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

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - X-rays: stars - accretion, accretion disks - open clusters and associations: individual: Orion Nebula Cluster, NGC 2264, Chamaeleon I

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1253 1
2 IC 348 OpC 03 44 34 +32 09.8           ~ 1247 1
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2038 1
4 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1615 0
5 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1597 1
6 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1011 1
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3137 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-10:36:56

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