VizieR Online Data Catalog: 100 brightest X-ray stars within 50pc of the Sun (Makarov+, 2003)
Abstract
Based on the Hipparcos and Tycho-2 astrometric catalogs and the ROSAT surveys, a sample of ~100 stars most luminous in X-rays within or around a distance of 50 pc is culled. The smallest X-ray luminosity in the sample is LX=9.8x1029erg/s; the strongest source in the solar neighborhood is II Peg, a RS CVn star, at LX=175.8x1029erg/s. With respect to the origin of X-ray emission, the sample is divided into partly overlapping classes of pre-main-sequence, post-T Tauri, and very young ZAMS objects (type XY), RS CVn-type binary stars (type RS), other active short-period binaries, including binary BY Dra-type objects (type XO), apparently single or long-period binary active evolved stars (type XG), contact binaries of WU UMa kind (type WU), apparently single or long-period binary variable stars of BY Dra kind (type BY), and objects of unknown nature (type X?). Chromospherically active, short-period binaries (RS and XO) make up 40% of the brightest X-ray emitters, followed by young stars (XY) at 30% and unknown sources (X?) at 15%.
(2 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- November 2003
- DOI:
- 10.26093/cds/vizier.51261996
- Bibcode:
- 2003yCat..51261996M
- Keywords:
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- X-ray sources;
- Stars: bright;
- Stars: nearby;
- Space velocities