Frequency Analysis of Delta Scuti and RR Lyrae Stars in OGLE-1 Database

Details Frequency Analysis of Delta Scuti and RR Lyrae Stars in OGLE-1 Database Frequency Analysis of Delta Scuti and RR Lyrae Stars in OGLE-1 Database

2001-11-16

arxiv.org/abs/astro-ph/0111335v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in proceedings of IAU Coll. 185 "Radial and Nonradial Pulsations as Probes of Stellar Physics"

Scientific paper

We discuss the results of a systematic search for multiperiodic pulsations in Galactic Bulge Delta Scuti and RR Lyrae stars. Six "normal" double-mode variables pulsating in two radial modes have been identified (5 Delta Scuti-type and 1 RR Lyrae-type). In 37 RR Lyrae stars secondary periodicities very close to the primary pulsation frequency have been detected. These periodicities correspond to nonradial modes of oscillation. They are found in \~23% of RRab and in ~3% of RRc variables of our sample.

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