CCD photometry and proper motions of late-type stars in the young open cluster Stock 2
Abstract
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.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- May 2000
- DOI:
- 10.1051/aas:2000187
- Bibcode:
- 2000A&AS..143..409F
- Keywords:
-
- STARS: EVOLUTION;
- STARS: LATE-TYPE;
- OPEN CLUSTERS: INDIVIDUAL;
- STOCK 2