Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....122..866p&link_type=abstract
The Astronomical Journal, Volume 122, Issue 2, pp. 866-875.
Astronomy and Astrophysics
Astronomy
58
Open Clusters And Associations: Individual (Ic 348), Stars: Coronae, Stars: Low-Mass, Brown Dwarfs, Stars: Pre-Main-Sequence, X-Rays
Scientific paper
We have obtained a deep (53 ks) X-ray image of the very young stellar cluster IC 348 with the Advanced CCD Imaging Spectrometer on board the Chandra X-Ray Observatory. In our image with a sensitivity limit of ~1×1028 ergs s-1 (more than 10 times deeper than our ROSAT images of IC 348), 215 X-ray sources are detected. While 115 of these sources can be identified with known cluster members, 58 X-ray sources are most likely new, still unidentified cluster members. About 80% of all known cluster members with masses between ~0.15 and 2 Msolar are visible as X-ray sources in our image. We discover X-ray emission at levels of ~1028 ergs s-1 from four of 13 known brown dwarfs and from three of 12 brown dwarf candidates in IC 348. We also detect X-ray emission from two deeply embedded objects, presumably class I protostars, south of the cluster center.
Preibisch Thomas
Zinnecker Hans
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