CCD photometry and proper motions of late-type stars in the young open cluster Stock 2

Details CCD photometry and proper motions of late-type stars in the young open cluster Stock 2 CCD photometry and proper motions of late-type stars in the young open cluster Stock 2

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..143..409f&link_type=abstract

Astronomy and Astrophysics Supplement, v.143, p.409-420

Astronomy and Astrophysics

Astrophysics

2

Stars: Evolution, Stars: Late-Type, Open Clusters: Individual, Stock 2

Scientific paper

We present the results of the first CCD BVRI photometric and proper motion study of late-type stars in the young open cluster Stock 2. Twenty-one fields of approximately 5'x 5' size have been observed photometrically, from which we have identified 118 candidate members based on their positions on colour-magnitude diagrams relative to theoretical isochrones. From a comparison of the known star density of the Pleiades, we estimate the contamination of this selection process due to background stars to be as large as ~ 50%. However, only 22 of those 118 candidate members have proper motions consistent with membership, suggesting that the contamination is of the order of 80%. Additional candidate members were found by means of a proper motion analysis of Schmidt plate material for a 3degx 3deg field containing the cluster. The cluster proper motion allows us to separate members from background and foreground stars. We have found 634 stars with a membership probability >= 50% down to a limiting magnitude of B ~ 20, corresponding to late-M dwarfs at the distance of Stock 2. Table 5 and the Table Appendix are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html.

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