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HD 114231


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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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观测天体数据

星座:半人馬座
右阿森松:13h09m56.44s
赤纬:-47°33'20.6"
视星:7.543
距离:558.659 天文距离
右阿森松适当运动:-14.7
赤纬适当运动:-8.9
B-T magnitude:9.593
V-T magnitude:7.713

目录:
适当名称   (Edit)
HD 1989HD 114231
TYCHO-2 2000TYC 8251-700-1
USNO-A2.0USNO-A2 0375-17506587
HIPHIP 64236

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