Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1482e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 4, p. 1482-1492.
Astronomy and Astrophysics
Astronomy
39
Chronology, Star Clusters, Stellar Models, Stellar Motions, Stellar Spectrophotometry, Praesepe Star Clusters, Radial Velocity, Red Giant Stars, Star Distribution, Stellar Luminosity
Scientific paper
The members of the Hyades supercluster brighter than about M(V) = + 4 mag and contained in the FK5, or having nearly FK5 quality proper motions, show a convergent point of (A,D) = (6h, + 6.5 deg). The Hyades cluster stars in the FK5 have a mean distance of 46.7 pc. The supercluster, as well as the Hyades and Praesepe cluster, populations represent at least three age groups. Standard models indicate ages of 3 to 4, 6, and 8 x 10 exp 8 yr, whereas model ages with convective overshoot are nearly twice this. Most of the Am and USPC stars in the supercluster are of the same age. The Ap stars mark the onset of shell hydrogen burning. The photometry of the red giants confirms the age spread and indicates a weakening of CN strength with age. Attention is called to the need for further study of NGC 2423 as an effective prolusion to understanding the evolution of the supercluster.
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