Double-mode RR Lyrae variables in M15

Details Double-mode RR Lyrae variables in M15 Double-mode RR Lyrae variables in M15

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266...94c&link_type=abstract

Astrophysical Journal, Part 1, vol. 266, Mar. 1, 1983, p. 94-104.

Other

132

Globular Clusters, Hertzsprung-Russell Diagram, Light Curve, Stellar Models, Variable Stars, Horizontal Branch Stars, Lyra Constellation, Pulsed Radiation, Stellar Luminosity, Stellar Radiation, Stellar Spectrophotometry

Scientific paper

The Sandage, Katem, and Sandage (1981) photometry of the RR Lyr variables in the Oosterhoff group II cluster M15 is used to analyze 10 double mode pulsators whose discovery was due to light curve scatter. The stars appear in the instability strip on the H-R diagram, between the pure fundamental and overtone pulsators, when only the well determined periods, relative luminosities, and linear pulsation theory data for realistic stellar models are employed. Such clumping of double mode pulsators at a transition line resembles the double mode classical Cepheid case, and implies the causing of double mode pulsation by some kind of mode switching. Other double mode RR Lyr variables discovered in M68 and the Draco galaxy, as well as the field variable AQ Leonis, are discussed.

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