Abstract. We present the results of V RI photometry of the young open cluster IC 2602. Two 15 arcmin × 15 arcmin fields were observed in February and May 1991 using the 1-m Swope telescope at Las Campanas. Using theoretical isochrones obtained from D' Antona & Mazzitelli (1994), and allowing for observational and other uncertainties, we identify 78 primary candidate members with 12 < V < 18.5 from their positions on colourmagnitude diagrams. We compare the cluster field with an offset field of similar galactic latitude and estimate the contamination due to background stars to be large, ≥ 50%, as might be expected given its low galactic latitude. We also compare our photometry with that given for the X-ray detected stars of Randich et al. (1995). We present complimentary narrow band Hα photometry for a subset of the stars.
Abstract. We present the results of the first CCD BV RI photometric and proper motion study of late-type stars in the young open cluster Stock 2.Twenty-one fields of approximately 5 × 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 3• ×3• 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 1 .
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