Thomas Preibisch & Hans Zinnecker
XMM-Newton study of the very young cluster IC 348
Astronomy and Astrophysics, 422, 1001-1012 (2004)
We analyze a XMM-Newton X-ray imaging observation
of the very young stellar cluster IC 348 with an observing time of 12 hours
and a corresponding
total (all detector) MOS-equivalent exposure time of 207 ksec.
Our observation is strongly affected by a very intense
solar particle flare,
due to which only the first half of the exposure time
can be used for scientific analysis.
We compare the X-ray sources seen by XMM-Newton with those found in
our previous Chandra study of IC 348 and find that XMM-Newton reveals
71 new X-ray sources, most of which are located outside the
field-of-view of the Chandra observation.
20 of these new X-ray sources can be identified with known
cluster members, and 19 sources are likely to be new
low-mass members of the cluster.
The lightcurves of the XMM-Newton sources show at most moderate levels
of variability, but no large flares.
We compare the spectral fitting results for 10 stars for which we have
good spectra from both Chandra and XMM-Newton, and find good agreement in the fitted
plasma temperatures, but a systematic difference in the fitted values
of the hydrogen column density (extinction).
We finally discuss the X-ray properties of the optically bright B1 star
o Per and the X-ray
detections among the deeply embedded young stellar objects to the south
of the optical cluster center (including HH 211-mm), and find that
none of the 23 spectroscopically identified brown dwarfs in IC 348 is
detected in our XMM-Newton data.
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