Evolution of Cepheids. I - The effects of an enhanced C-12(alpha, gamma)O-16 rate

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Abstract

view Abstract Citations (17) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolution of Cepheids. I. The Effects of an Enhanced 12C( alpha , gamma ) 16O Rate Brunish, W. M. ; Becker, S. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1990 DOI: 10.1086/168460 Bibcode: 1990ApJ...351..258B Keywords: Cepheid Variables; Nuclear Astrophysics; Stellar Evolution; Stellar Interiors; Carbon Monoxide; Hertzsprung-Russell Diagram; Nuclear Reactions; Stellar Mass; Stellar Models; Astrophysics; NUCLEAR REACTIONS; STARS: CEPHEIDS; STARS: EVOLUTION; STARS: INTERIORS full text sources ADS |

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