A search for double-mode RR Lyrae stars in the globular cluster M68

Details A search for double-mode RR Lyrae stars in the globular cluster M68 A search for double-mode RR Lyrae stars in the globular cluster M68

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..240c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 240-249.

Astronomy and Astrophysics

Astronomy

13

Globular Clusters, Horizontal Branch Stars, Lyra Constellation, Stellar Mass, Stellar Oscillations, Stellar Structure, Astronomical Catalogs, Color-Magnitude Diagram, Metallic Stars, Variable Stars

Scientific paper

Published observations of 23 c-type RR Lyr stars in M68 have been analyzed in a search for double-mode pulsators (RRd stars). There are at least seven and possibly as many as 10 RRd stars with primary periods in the range of 0.39-0.41 d. Reliable values of both the fundamental and first overtone periods have been obtained for one of the stars (V3). The double-mode pulsation mass for V3, using the King Ia (Y = 0.299, Z = 0.001) mass calibration of Cox et al. (1983), is 0.64 + or - 0.005 solar mass.

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