Computer Science
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cpsp.book..247a&link_type=abstract
In NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities p 247-270 (SEE N80-25229 15-90)
Computer Science
Cepheid Variables, Scutum Constellation, Star Distribution, Hydrodynamics, Periodic Variations, Radial Velocity, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution
Scientific paper
Some of the properties of the atmospheric variations in delta Scuti stars were investigated with emphasis on the amplitude and the shape of both light curves and radial velocity curves. It is shown that these curves are small and rapidly variable in the case of dwarf Scuti stars; for the evolved stars the situation is more complex. The relation between variables and nonvariables, and also the results on abundances in the atmospheres of these stars were surveyed with respect to the hydrodynamics of their envelopes. The abundance anomalies of Am stars were qualitatively examined. The coexistence of abundance anomalies and variability among giants were also studied. Attempts were made to relate the variability to the hydrogen ionization zone in an envelope deprived of helium. Specific results are reported.
Auvergne Michel
Baglin Annie
Le Contel J.-M.
Valtier Jean-Claude
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