Mathematics – Probability
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..192s&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, July 1, 1978, p. 192-201.
Mathematics
Probability
20
Star Clusters, Stellar Evolution, Stellar Spectrophotometry, Variable Stars, A Stars, F Stars, Main Sequence Stars, Pleiades Cluster, Radial Velocity, Stellar Motions
Scientific paper
To investigate the incidence of Delta Scuti variables in the Alpha Persei cluster, a program of differential photometry was undertaken which included 24 A- and F-type stars (V no more than 9.48) in or near the Delta Scuti instability strip. All stars in the sample were determined to have a high probability of cluster membership on the basis of multiple criteria, including proper motions, radial velocities, and extensive photometric data. Three variables were detected (BD +48 deg 894, BD +48 deg 905, and BD +47 deg 842). These are located in the region of the instability strip and have periods close to those predicted from the period-color-luminosity relation. The relative incidence of Delta Scuti variables in the cluster is approximately 25%. As in the Pleiades cluster, the main-sequence variables may be slower rotators than the nonvariables in the instability strip. The exclusion of pulsation among main-sequence Am stars in the cluster is also confirmed.
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