Other
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..309l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 15, 1984, p. 309-322.
Other
13
Cosmic Dust, Gravitational Collapse, Interstellar Matter, Mass Distribution, Stellar Evolution, Abundance, Giant Stars, Protostars, Stellar Color, Stellar Magnitude, Stellar Models
Scientific paper
It is argued that gravitational sedimentation of grains in interstellar clouds may lead to proto-stars with radial abundance inhomogeneities. Recent collapse calculations are reviewed which show that convection may not reach the central regions, and thus the abundance inhomogeneity may survive to the zero age main sequence. It is therefore assumed that stars form with a small core of enhanced metal abundance, and the evolution of such stars of various masses is followed to the giant branch. The results provide an explanation for the previously anomalous color-magnitude diagrams of NGC 2420 and 2506, without destroying the agreement for other clusters. A comparison between the structure of gaps appearing in theoretical isochrones and those observed in cluster color-magnitude diagrams shows that the discrepancies noted by Maeder largely disappear when recent opacity tables are used. The agreement between theory and observation can be further improved in the case of initially inhomogeneous models.
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