Volume 421, Number 1, July I 2004
|Page(s)||175 - 186|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||11 June 2004|
I. X-ray spectroscopy and photometry
Dip. di Astronomia, Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
2 INAF – Osservatorio Astronomico di Palermo Piazza del Parlamento 1, 90134 Palermo, Italy e-mail: email@example.com, firstname.lastname@example.org, email@example.com
3 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, UK e-mail: firstname.lastname@example.org
Corresponding author: I. Pillitteri, email@example.com
Accepted: 10 March 2004
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.
Key words: X-ray: stars / stars: activity / Galaxy: open clusters and associations: individual: Blanco 1
© ESO, 2004
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