/ftp/cats/J_AN/329/801



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J/AN/329/801     Agglomerate of early-type Hipparcos stars    (Caballero+, 2008)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	table1.dat tablea1.dat
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Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/AN/329/801
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Beginning of ReadMe : J/AN/329/801 Agglomerate of early-type Hipparcos stars (Caballero+, 2008) ================================================================================ A revisit to agglomerate of early-type Hipparcos stars. Caballero J.A., Dinis L. <Astron. Nachrichten, 329, 801-834 (2008)> =2008AN....329..801C ================================================================================ ADC_Keywords: Associations, stellar ; Stars, early-type ; Proper motions Keywords: stars: early-type - open clusters and associations: general - open clusters and associations: individual (Ori OB1b, P Puppis) - methods: data analysis - astronomical data bases: miscellaneous Abstract: We study the spatial structure and sub-structure of regions rich in Hipparcos stars with blue BT-VT colours. These regions, which comprise large stellar complexes, OB associations, and young open clusters, are tracers of on-going star formation in the Galaxy. The DBSCAN (Density-Based Spatial Clustering of Applications with Noise) data clustering algorithm is used to look for spatial overdensities of early-type stars. Once an overdensity, "agglomerate", is identified, we carry out a data and bibliographic compilation of their star member candidates. The actual membership in agglomerate of each early-type star is studied based on its heliocentric distance, proper motion, and previous spectro-photometric information. We identify 35 agglomerates of early-type Hipparcos stars. Most of them are associated to previously known clusters and OB associations. The previously unknown P Puppis agglomerate is subject of a dedicated study with Virtual Observatory tools.

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