Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..258b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 258-262.
Astronomy and Astrophysics
Astrophysics
14
Cepheid Variables, Nuclear Astrophysics, Stellar Evolution, Stellar Interiors, Carbon Monoxide, Hertzsprung-Russell Diagram, Nuclear Reactions, Stellar Mass, Stellar Models
Scientific paper
Models of intermediate-mass stars (4, 5, 6, 7, 8, and 9 solar masses with Y = 0.28, Z = 0.02) have been calculated with the C-12(alpha, gamma)O-16 rate of Caughlan et al. (1985). Although the rate for the C-12(alpha, gamma)O-16 reaction has been recently redetermined and found to be almost the same as it was in Fowler, Caughlan, and Zimmerman (1975), the rate is uncertain within a factor of 2. The influence of an enhanced rate on the evolutionary behavior of intermediate-mass stars in the H-R diagram is explored by using the Caughlan et al. rate. The enhanced rate extends the tip of the blue loop in the H-R diagram, allowing the 5 and 6 solar mass models with a standard Population I composition to reenter the Cepheid strip during core He-burning, unlike the models calculated using the Fowler, Caughlan, and Zimmerman rates.
Becker S. A.
Brunish Wendee M.
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