Proper motion and membership determination in the young open cluster NGC 1662

Citation
Ws. Dias et al., Proper motion and membership determination in the young open cluster NGC 1662, ASTRON ASTR, 357(1), 2000, pp. 149-152
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
357
Issue
1
Year of publication
2000
Pages
149 - 152
Database
ISI
SICI code
0004-6361(200005)357:1<149:PMAMDI>2.0.ZU;2-5
Abstract
Relative proper motions and cluster membership probabilities of 30 stars wi thin an area of 14' of diameter centered in the open cluster NGC 1662 (alph a = 04(h)48(m), delta = +10 degrees 56') are determined by combining positi ons of stars observed by the Valinhos CCD meridian circle with those from o ther astrometric catalogues. Our basic source for first epoch of stars brighter than B = 13 magnitudes i s the AC2000 Catalogue, which provides a time baseline of about 90 years, w hereas 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) metho d. The cluster proper motion was found to be (-3.2 +/- 0.6) mas/yr in right ascension and (-1.6 +/- 0.6) mas/yr in declination.