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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.
| Chemically peculiar stars in open clusters. I - The catalog
The largest existing compilation is presented of Ap and Am open clusterstars. The catalog contains information on 381 chemically peculiar (CP)stars of the upper main sequence in 79 open clusters. The catalog iscomposed of the following tables: (1) the main body, which lists CP (orsuspected CP) stars which are kinematical (or suspected kinematical)members of open clusters; (2) the list of CP (or suspected CP) starssometimes numbered among cluster members but which are actuallykinematical nonmembers; (3) the list of stars sometimes designated as'peculiar' but, in fact, probably not CP; (4) references for numberingsystems of cluster stars; (5) references for membership; and (6)references for spectral and/or peculiarity types.
| Distance Moduli of Open Clusters.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1965ApJS...12..215H&db_key=AST
| Spectral Classification in Nine Open Clusters.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962ApJ...136..788S&db_key=AST
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Orion |
| Ascensió Recta: | 04h48m24.94s |
| Declinació: | +10°55'09.1" |
| Magnitud Aparent: | 9.555 |
| Moviment propi RA: | -1.5 |
| Moviment propi Dec: | -0.6 |
| B-T magnitude: | 9.832 |
| V-T magnitude: | 9.578 |
Catàlegs i designacions:
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