Volume 399, Number 3, March I 2003
|Page(s)||919 - 929|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||14 February 2003|
The X-ray Luminosity Distributions of the high-metallicity open cluster Blanco 1
Dipartimento di Scienze Fisiche e Astronomiche, Sezione di Astronomia, Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy e-mail: firstname.lastname@example.org
2 INAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy e-mail: email@example.com, firstname.lastname@example.org
3 Astrophysics Division, Research & Scientific Support Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands e-mail: email@example.com
Corresponding author: I. Pillitteri, firstname.lastname@example.org
Accepted: 10 October 2002
We present X-ray Luminosity Distributions (XLDs) of late-type members (dF, dG, dK, dM) of the Blanco 1 cluster, based on ROSAT-HRI data and new astrometric-photometric membership obtained from the GSC-II project. For the first time we present the XLD of dM stars of this cluster. The high metallicity of Blanco 1 allows us to investigate the role of chemical composition on the coronal emission of late-type stars. Comparison between X-ray Luminosity Distributions of Blanco 1 and Pleiades, NGC 2516 and α Per suggests a possible metallicity effect in dM stars.
Key words: X-ray: stars / stars: activity / open clusters and associations: individual: Blanco 1
© ESO, 2003
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