Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..642e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, May 1983, p. 642-649.
Astronomy and Astrophysics
Astronomy
34
Astrometry, Star Clusters, Stellar Motions, Distance, Stellar Color, Stellar Luminosity, Tables (Data)
Scientific paper
Without use of trigonometric parallaxes, the distances of some 50 bright stars have been determined on the basis of their well-determined proper motions and membership in a supercluster that includes Sirius. The astrometric parallaxes are in excellent agreement with those obtained from photometric parameters and, for the stars within 40 pc of the sun, they are also in agreement with trigonometric determinations. The supercluster stars are near 2.4 x 10 to the 8th yr old with (Fe/H) near -0.1. The resulting color-luminosity array confirms the expected main-sequence displacement for stars with a metal abundance only about two thirds that of the Hyades supercluster members. The supercluster contains the UMa cluster and M39 (NGC 7092) but the former, at least, has only attracted attention because of the concentration of a few bright (Dipper) supercluster members in Ursa Major.
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