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Astron. Astrophys. 324, 690-698 (1997)
X-ray emitting stars in the NGC 1333 star forming region
Thomas Preibisch
Astronomisches Institut der Universität
Würzburg, Am Hubland, D-97074 Würzburg, Germany
(preib@astro.uni-wuerzburg.de)
Received 15 October 1996 / Accepted 11 February 1997
Abstract
We present the results of a very deep ROSAT HRI X-ray observation
of the highly active star forming region NGC 1333. In total we
could detect 20 X-ray sources, 16 of which we assume to be members to
the cluster of pre main sequence stars. Since most of the stars in
NGC 1333 are still deeply embedded in the molecular cloud
(![[FORMULA]](img1.gif)
mag), we use near infrared data to estimate
individual extinctions for the calculation of X-ray luminosities.
One of the X-ray sources is identified with the optically
invisible, very deeply embedded (![[FORMULA]](img2.gif)
mag) infrared
class I source SVS16, for which we find an extremely high X-ray
luminosity of ![[FORMULA]](img3.gif)
erg/sec, making this object one of
the most X-ray luminous pre main sequence stars known to date.
Since we have already performed similar sensitive ROSAT observations of the young cluster IC 348 (the second active star forming region in the Perseus molecular cloud complex), we compare the X-ray properties of the young stars in NGC 1333 to those in IC 348. We find no evidence for a significant change of the X-ray luminosity function during the first few million years in the life of the pre main sequence stars.
Key words: X-rays:
stars 
open clusters: individual:
NGC 1333
stars: coronal
pre-main-sequence stars
Contents
- 1. Introduction
- 2. X-ray observation and data analysis
- 3. Membership
- 4. X-ray properties of the PMS stars
- 5. The X-ray emission from the infrared source SVS16
- 6. Comparison with IC 348
- 7. Summary and conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 1997
Online publication: May 26, 1998
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