OB associations from Hipparcos

DOI

A comprehensive census of the stellar content of the OB associations within 1 kpc from the Sun is presented, based on Hipparcos positions, proper motions, and parallaxes. It is a key part of a long-term project to study the formation, structure, and evolution of nearby young stellar groups and related star-forming regions. OB associations are unbound "moving groups", which can be detected kinematically because of their small internal velocity dispersion. The nearby associations have a large extent on the sky, which traditionally has limited astrometric membership determination to bright stars (V~<6mag), with spectral types earlier than ~B5. The Hipparcos measurements allow a major improvement in this situation. Moving groups are identified in the Hipparcos Catalog by combining de Bruijne's (1999MNRAS.306..394H) refurbished convergent point method with the "Spaghetti method" of Hoogerwerf & Aguilar (1999, MNRAS, in press). Astrometric members are listed for 12 young stellar groups, out to a distance of ~650pc. These are the three subgroups Upper Scorpius, Upper Centaurus Lupus, and Lower Centaurus Crux of Sco OB2, as well as Vel OB2, Tr 10, Col 121, Per OB2, {alpha} Persei (Per OB3), Cas-Tau, Lac OB1, Cep OB2, and a new group in Cepheus, designated as Cep OB6.

Cone search capability for table J/AJ/117/354/tablec1 (Membership list)

Identifier
DOI http://doi.org/10.26093/cds/vizier.51170354
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/AJ/117/354
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/117/354
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/117/354
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/AJ/117/354
Provenance
Creator De Zeeuw P.T.; Hoogerwerf R.; De Bruijne J.H.J.; Brown A.G.A.; Blaauw A.
Publisher CDS
Publication Year 2007
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Natural Sciences; Physics; Stellar Astronomy