Mathematics – Probability
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1564b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 5, May 1992, p. 1564-1572.
Mathematics
Probability
51
Blue Stars, Hot Stars, Radial Distribution, Stellar Evolution, Subdwarf Stars, Color-Magnitude Diagram, Globular Clusters, Stellar Mass, Stellar Spectrophotometry
Scientific paper
A U - V color-magnitude diagram containing over 5000 stars from 10 fields in Omega Centauri at or brighter than the main-sequence turnoff is presented. Completeness corrections are obtained as a continuous function of magnitude and radial distance are obtained and used to show that the blue subdwarfs are centrally concentrated with respect to subgiants and stars on the horizontal branch proper. The chance probability of this result is less than 1 percent. Since the blue subdwarfs probably consist of helium-burning cores of about 0.5 solar mass surrounded by a thin hydrogen envelope, mass segregation could not produce this result if these stars had evolved singly. Two kinds of possible precursor systems are considered: pairs of degenerate dwarfs which subsequently merge to form helium-burning stars, and moderately wide binaries in which mass transfer is initiated shortly before the helium flash is ignited.
Bailyn Charles D.
Cohn Haldan
Grindlay Jonathan E.
Lugger Phyllis Minnie
Sarajedini Ata
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