Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112..618c&link_type=abstract
Astronomical Journal v.112, p.618
Astronomy and Astrophysics
Astronomy
9
Stars: Variables: Rr Lyrae, Globular Clusters: Individual: M9
Scientific paper
CCD observations have been used to derive precise light curves for six of the previously known RR Lyrae variables in the Oosterhoff type II globular cluster M9 and to search for additional variables. Nine variables have been discovered, eight of the RR Lyrae type. As a result, the total number of RR Lyrae variables has been revised from 9 to 17 (9 RRc and 8 RRab), the mean period of the RRc stars has been revised from 0d.341 to 0d.342 and that of the RRab stars from 0d.621 to 0d.638 Simon's method that relates physical properties of RRc stars to the pulsation period and Fourier phase parameter φ31 has been used to determine the mass, luminosity, and temperature for one of the RRc stars. Published observations of RR Lyrae stars in M15 have been used to test Simon's method and the results are promising. The formulae of Jurcsik and Kovács for relating Fourier parameters of RRab stars to [Fe/H] have been used to derive a metal abundance for M9.
Clement Christine M.
Shelton Ian
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