Astrophysical supplements to the ASCC-2.5. Ia. Radial velocities of about 55000 stars and mean radial velocities of 516 Galactic open clusters and associations

TL;DR

This paper presents the second version of a comprehensive catalog combining astrometric and radial velocity data for stars and clusters, improving the accuracy of mean radial velocities for numerous Galactic open clusters and associations.

Contribution

The paper introduces CRVAD-2 and CRVOCA, integrating multiple data sources to provide updated radial velocities and astrometric data for thousands of stars and clusters, enhancing previous catalogs.

Findings

Mean radial velocities for 363 open clusters and 60 associations derived.

Critical review and revision of literature RVs for 330 clusters.

CRVOCA contains data on about 460 clusters and 60 associations.

Abstract

We present the 2nd version of the Catalogue of Radial Velocities with Astrometric Data (CRVAD-2). This is the result of the cross-identification of stars from the All-Sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5) with the General Catalogue of Radial Velocities and with other recently published radial velocity lists and catalogues. The CRVAD-2 includes accurate J2000 equatorial coordinates, proper motions and trigonometric parallaxes in the Hipparcos system, $B, V$ photometry in the Johnson system, spectral types, radial velocities (RVs), multiplicity and variability flags for 54907 ASCC-2.5 stars. We have used the CRVAD-2 for a new determination of mean RVs of 363 open clusters and stellar associations considering their established members from proper motions and photometry in the ASCC-2.5. For 330 clusters and associations we compiled previously published mean RVs from the literature, critically reviewed and partly revised them. The resulting Catalogue of Radial Velocities of Open Clusters and Associations (CRVOCA) contains about 460 open clusters and about 60 stellar associations in the Solar neighbourhood. These numbers still represent less than 30% of the total number of about 1820 objects currently known in the Galaxy. The mean RVs of young clusters are generally better known than those of older ones.