XMM-Newton observations of the young open cluster Blanco 1. I. X-ray spectroscopy and photometry
Abstract
We present an X-ray study of the high metallicity young open cluster Blanco 1 based on XMM-Newton data. X-ray spectroscopy of cluster members is presented for the first time as well as new X-ray distribution functions of late-type stars. We detected all known dF and dG stars in the EPIC field and 80% and 90% of dK and dM stars, respectively. The X-ray spectral analysis of the X-ray brightest cluster stars and X-ray color analysis of a larger sample show that a model with two temperatures (at about 0.3 and 1 keV) explains the quiescent activity phase spectra.
We discuss also the nature of unidentified X-ray sources in the observed region and their X-ray spectral properties. Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. Appendix B is only available in electronic form at http://www.edpsciences.org- Publication:
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Astronomy and Astrophysics
- Pub Date:
- July 2004
- DOI:
- 10.1051/0004-6361:20035869
- arXiv:
- arXiv:astro-ph/0403303
- Bibcode:
- 2004A&A...421..175P
- Keywords:
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- X-ray: stars;
- stars: activity;
- Galaxy: open clusters and associations: individual: Blanco 1;
- Astrophysics
- E-Print:
- 18 pages, 8 figures, paper accepted for publication on A&