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The Coma Berenices star cluster and its moving group
We report on the analysis of astrometric and photometric data fromHipparcos, Tycho and the ACT catalogue in a 1200 sq. degree field aroundthe nearby open star cluster in Coma Berenices and infer thecharacteristic features of this cluster. From a sample of 51 kinematicmembers we derive the cluster's distance, size and spatial structure aswell as its stellar content, mass and age. We find that the clusterconsists of an elliptical core-halo system with major axis parallel tothe direction of galactic motion, and of a moving group of extratidalstars. The latter have tangential distances >= 10 pc from the clustercenter, but have the same distance from the Sun, the same motion and thesame age as the stars in the core and halo. The luminosity function ofthe core-halo system steeply declines beyond absolute magnitude M_V=4.5,but that of the moving group rises towards fainter magnitudes andsuggests the existence of further low-mass members below the currentmagnitude limit. The cloud of extratidal stars witnesses the process ofdissolution of the cluster.
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Observation and Astrometry data
| Constellation: | Κένταυρος |
| Right ascension: | 13h09m56.44s |
| Declination: | -47°33'20.6" |
| Apparent magnitude: | 7.543 |
| Distance: | 558.659 parsecs |
| Proper motion RA: | -14.7 |
| Proper motion Dec: | -8.9 |
| B-T magnitude: | 9.593 |
| V-T magnitude: | 7.713 |
Catalogs and designations:
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