EDP Sciences
Free access
Volume 399, Number 3, March I 2003
Page(s) 919 - 929
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20021818

A&A 399, 919-929 (2003)
DOI: 10.1051/0004-6361:20021818

The X-ray Luminosity Distributions of the high-metallicity open cluster Blanco 1

I. Pillitteri1, G. Micela2, S. Sciortino2 and F. Favata3

1  Dipartimento di Scienze Fisiche e Astronomiche, Sezione di Astronomia, Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
    e-mail: pilli@astropa.unipa.it
2  INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
    e-mail: giusi@astropa.unipa.it, sciorti@astropa.unipa.it
3  Astrophysics Division, Research & Scientific Support Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
    e-mail: fabio.favata@rssd.esa.int

(Received 22 October 2001 / 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 $\alpha$ Per suggests a possible metallicity effect in dM stars.

Key words: X-ray: stars -- stars: activity -- open clusters and associations: individual: Blanco 1

Offprint request: I. Pillitteri, pilli@astropa.unipa.it

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