Computer Science
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phdt.........7h&link_type=abstract
Ph.D. Thesis City Univ. of New York, NY.
Computer Science
6
Computerized Simulation, Lyra Constellation, Opacity, Stellar Luminosity, Stellar Models, Chemical Composition, Helium, Stability, Stellar Mass
Scientific paper
The RR Lyrae instability strip is investigated with computer models that were calculated using Carson opacities. A nonlinear computer program was applied to fundamental and first overton modes of pulsation (ab- and c-type, respectively). Comparison of the models with observed surface light and velocity curves showed good agreement in phase of the secondary bump on the velocity curve and light amplitude for M/M* = 0.60 - 0.65 log (L/L*) approx 1.7 and Y = 0.25. A linear computer program was used to examine the location of the blue edges of the instability strip as mass and chemical composition varied. The results of the linear survey showed: (1) no substantial change in the PTLM relation due to opacity; (2) similar blue edges to those in previous studies that employed the Los Alamos opacity series are calculated with the Carson models for a lower helium abundance and with masses more consistent with evolutionary tracks. Several comparison tests of the models with observations showed good agreement. The overall linear results indicated a mass of 0.70 + or - 0.05 M* and a helium content of 0.25 + or - 0.04.
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