Title of article :
Age and metallicity distribution of the Galactic bulge from extensive optical and near-IR stellar photometry
Author/Authors :
Bica، E. نويسنده , , Rejkuba، M. نويسنده , , Barbuy، B. نويسنده , , Ortolani، S. نويسنده , , Zoccali، M. نويسنده , , Renzini، A. نويسنده , , Greggio، L. نويسنده , , Saviane، I. نويسنده , , Cassisi، S. نويسنده , , Rich، R. M. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Abstract :
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 Per suggests a possible metallicity effect in dM stars.
Keywords :
Galaxy , stars , bulge , Hertzsprung-Russell (H-R) , C-M diagrams , luminosity function , mass function
Journal title :
Astronomy and Astrophysics
Journal title :
Astronomy and Astrophysics
