The variable stars in the Local Group of galaxies

Details The variable stars in the Local Group of galaxies The variable stars in the Local Group of galaxies

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mmsai..51..749r&link_type=abstract

(Società Astronomica Italiana, Convegno sulla Variabilita Stellare, 1st, Massalubrense, Italy, May 22-24, 1980.) Società Astrono

Astronomy and Astrophysics

Astronomy

5

Cepheid Variables, Galactic Clusters, Local Group (Astronomy), Stellar Evolution, Stellar Radiation, Variable Stars, Andromeda Constellation, Asymptotic Giant Branch Stars, Hertzsprung-Russell Diagram, Lyra Constellation, Magellanic Clouds, Milky Way Galaxy, Stellar Luminosity

Scientific paper

The characteristics of certain types of pulsating variable stars in galaxies of the Local Group are reviewed, and theoretical interpretations of the stars are discussed. Consideration is given to the period-frequency distribution of classical Cepheids in Andromeda, the Magellanic Clouds and the Milky Way, which is interpreted by a combination of stellar evolution theory and pulsation theory. The average periods of ab-type RR Lyrae stars pulsating in the fundamental mode are compared for those found in Galactic globular clusters, dwarf spheroidal galaxies and the Magellanic Clouds, and possible explanations for the appearance of a bimodal period distribution only in Galactic clusters are considered. The properties and mechanisms of the anomalous Cepheids found in dwarf spheroidal galaxies and the Small Magellanic Cloud, which are characterized by a shorter period and different period-luminosity relation than BL Her variables, are discussed in terms of pulsation theory, mass exchange in binary systems and very close binary systems. Finally, attention is given to the possible origin of red variables representing the asymptotic giant branch in the Fornax dwarf spheroidal, and the importance of an extended search for red variables, particularly Miras, in the Magellanic Clouds is noted.

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