Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1876w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 5, p. 1876-1891.
Astronomy and Astrophysics
Astronomy
46
Main Sequence Stars, Star Clusters, Stellar Mass, White Dwarf Stars, Milky Way Galaxy, Red Giant Stars
Scientific paper
By subtracting the cooling age of the dimmest white dwarf in the Hyades cluster from the age of the cluster, the mass of the white dwarf progenitor is estimated to be 3.0 solar masses, compared with the 2.25 solar masses for a main sequence stars near the turnoff point in the cluster. It is inferred that there should be at least 21 white dwarfs dimmer than the seven confirmed white dwarf cluster members which presumably derive from stars of initial mass 2.5-3 solar. It is found that about two fifths of all nearby white dwarfs are streaming within 13 deg of the direction of the Hyades convergent point with a velocity dispersion of 5 km/s about the cluster speed of 46.6 km/s. The shape of orbits of stars leaving a hypothetic cluster is examined and related to the supercluster concept of Eggen.
Casertano Stefano
Iben Icko Jr.
Jordan Stefan
Weidemann Volker
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