Other
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..358n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Aug. 1986, p. 358-366.
Other
22
Globular Clusters, Stellar Oscillations, Stellar Spectrophotometry, Variable Stars, Angular Velocity, Dwarf Galaxies, Horizontal Branch Stars, Light Curve, Pulse Duration, Stellar Evolution, Stellar Mass, Stellar Rotation
Scientific paper
Using Martin's (1939) extensive photometry of variable stars in the globular cluster ω Centauri (NGC 5139 = C1323-472), the brightness variations of 55 RR Lyrae stars have been thoroughly analyzed in a search for multiply periodic stars. Despite the fact that there are at least six short-period ab type Blazhko variables in ω Cen, in the period interval 0d.35 to 0d.50 there appear to be no doubly periodic RR Lyrae stars of the kind previously found in the globular clusters M3, M15, M68, and IC 4499, and in the Draco dwarf galaxy. One possible reason for the absence of such stars in ω Cen is that the horizontal-branch stars might be rotating relatively faster than similar stars in systems known to have produced RRd stars. This might also explain the apparent absence of RRd stars in M5 (Nemec and Clement, 1986). Other possibilities are discussed.
Nemec Amanda F. L.
Nemec James M.
Norris Jackson
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