Proper motion and membership determination in the young open cluster NGC1662

Details Proper motion and membership determination in the young open cluster NGC1662 Proper motion and membership determination in the young open cluster NGC1662

2000-03-29

arxiv.org/abs/astro-ph/0003440v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 PostScript figures, accepted for publication in Astronomy and astrophysics main journal

Scientific paper

Relative proper motions and cluster membership probabilities of 30 stars within an area of 14' of diameter centered in the open cluster NGC1662 (\alpha=04^{\rm h}48^{\rm m}, \delta=+10^{\rm o}56') are determined by combining positions of stars observed by the Valinhos CCD meridian circle with those from other astrometric catalogues. Our basic source for first epoch of stars brighter than B=13 magnitudes is the AC2000 Catalogue, which provides a time baseline of about 90 years, whereas the USNO-A2.0 Catalogue is used for fainter stars, providing a time baseline of about 40 years in this region. Average accuracies in proper motion of 2 mas/yr and 7 mas/yr are achieved, respectively, when the AC2000 or the USNO-A2.0 is used. Membership determination is obtained by applying the Zhao & He (1990) method. The cluster proper motion was found to be (-3.2\pm 0.6) mas/yr in right ascension and (-1.6\pm 0.6) mas/yr in declination.

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