Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..461c&link_type=abstract
Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 1, p. 461-471.
Astronomy and Astrophysics
Astrophysics
49
Astronomical Models, Cepheid Variables, Giant Stars, Stellar Evolution, Helium, Hydrogen, Opacity, Radiative Transfer, Stellar Envelopes, Stellar Mass, Stellar Rotation, Stellar Structure
Scientific paper
Comparison of evolutionary tracks, pulsation constants, and linearized pulsational-stability coefficients for stellar models applicable to the problems of classical Cepheids, whose structures were calculated using the Cox-Stewart (1965) opacities and a recently computed set of opacities. The latter are based on the hot 'Thomas-Fermi' statistical model of the atom for all elements heavier than hydrogen and helium; they contain larger helium and metals contributions, but a smaller hydrogen contribution than the former ones for the same chemical composition. The difference in metals contribution affects mainly the location and shape of the evolutionary tracks on the H-R diagram, while the difference in hydrogen and helium contributions has its greatest effect on the pulsational properties of the Cepheid models. From the comparison of evolutionary tracks it is concluded that: (1) the theoretical M/L relation for evolved giants is changed very little by using the second set of opacities; (2) Q-values for the fundamental mode of radial pulsation in Cepheid envelope models increase if the second set is used, but the classical mass discrepancy remains; and (3) the second set leads to pulsational-instability.
Carson Richard T.
Stothers Richard
No associations
LandOfFree
Evolutionary problems of Cepheids and other giants investigated with new radiative opacities does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evolutionary problems of Cepheids and other giants investigated with new radiative opacities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolutionary problems of Cepheids and other giants investigated with new radiative opacities will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1216376