Stellar, Substellar and Protostellar Coronae
in the Very Young Cluster IC 348
Thomas Preibisch & Hans Zinnecker
Oral presentation at the conference
"Stellar Coronae in the Chandra and XMM-Newton era"
June 25-29, 2001
ESTEC, Noordwijk, The Netherlands
Publications of the Astronomical Society of the Pacific (PASP)
Conference Series 277, p. 185
Editors: Fabio Favata and Jeremy Drake
Abstract
We have obtained a deep (53 ksec) 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 x 10^28 erg/sec
(more than 10 x 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 M_sun and 2 M_sun are visible
as X-ray sources in our image.
We discover X-ray emission at levels of ~ 10^28 erg/sec
from 4 of 13 known brown dwarfs
and from 3 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.
For further information see our
first
and
second paper in the Astronomical Journal.
You can also get preprints of paper I
and paper II.
ROSAT and
CHANDRA
images of IC 348 can be found here.
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