A Search for Star Clusters from the [ITAL]Hipparcos[/ITAL] Data
Citations Over TimeTop 15% of 1998 papers
Abstract
We present results of a search for nearby star clusters and associations using Hipparcos Catalogue data, restricting the sample to stars with parallaxes above 2 mas (d ≲ 500 pc). Two new OB associations have been identified in the Carina-Vela and Cepheus-Cygnus-Lyra-Vulpecula regions. A very probable new open cluster has been discovered in Carina. The cluster, a Car, named after its brightest member, is young (60 Myr) and nearby (d = 132 pc). However, only seven bona fide members can be drawn from the Hipparcos data. We report a detection of nine open cluster candidates in the distance range of 150 to 400 pc, and six possible associations almost all located within the Gould belt, although slightly older than the known nearby associations. In all cases, we present Yale theoretical isochrone fits to the color-magnitude diagrams, which indicate a moderate spread of ages between 60 to 200 Myr. Evidently, these young open cluster and association candidates are related to the overall distribution of young OB and A-type stars in the solar neighborhood.
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