| Issue |
A&A
Volume 410, Number 3, November II 2003
|
|
|---|---|---|
| Page(s) | 951 - 959 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20031322 | |
| Published online | 17 November 2003 | |
XMM-Newton study of the Serpens star-forming region
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Corresponding author: preib@mpifr-bonn.mpg.de
Received:
23
June
2003
Accepted:
19
August
2003
We analyze a XMM-Newton X-ray observation of the Serpens dark cloud with a total MOS-equivalent exposure time of 57 ksec. We find 45 individual X-ray sources. None of the class 0 protostars, only one of the class I protostars, and two of the flat-spectrum objects in the region are detected in X-rays. The optically invisible flat-spectrum source EC 95, a very young intermediate mass object, is the strongest X-ray source in the Serpens cloud. The analysis of its X-ray spectrum shows that the hydrogen column density towards EC 95 is considerably lower than expected from the extinction determined from near-IR spectroscopy and photometry. Possible reasons for this inconsistency are discussed.
Key words: open clusters and associations: individual: Serpens dark cloud / stars: formation / stars: coronae / stars: low-mass, brown dwarfs / stars: pre-main sequence / X-rays: stars
© ESO, 2003
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