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Proper motion and membership determination in the young open cluster NGC 1662
Relative proper motions and cluster membership probabilities of 30 starswithin an area of 14' of diameter centered in the opencluster NGC 1662 (alpha =04h48m, delta=+10o56') are determined by combining positions ofstars observed by the Valinhos CCD meridian circle with those from otherastrometric catalogues. Our basic source for first epoch of starsbrighter than B=13 magnitudes is the AC2000 Catalogue, which provides atime baseline of about 90 years, whereas the USNO-A2.0 Catalogue is usedfor fainter stars, providing a time baseline of about 40 years in thisregion. Average accuracies in proper motion of 2 mas/yr and 7 mas/yr areachieved, respectively, when the AC2000 or the USNO-A2.0 is used.Membership determination is obtained by applying the Zhao & He(\cite{zha}) method. 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.
| The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
| Uvby-beta photometry of open clusters. IV. NGC 1444, NGC 1662, NGC 2129, NGC 2169 and NGC 7209.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1994RMxAA..28..139P&db_key=AST
| Distance Moduli of Open Clusters.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1965ApJS...12..215H&db_key=AST
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