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Journal Article
Search for Low–Instability Strip Variables in the Young Open Cluster NGC 2516
1998
Overview
In this paper we revise and complete the photometric survey of the instability strip of the southern open cluster NGC 2516 published byAntonello & Mantegazza. No variable stars with amplitudes larger than 0.02 mag were found. However, by means of an accurate analysis based on a new statistical method, two groups of small‐amplitude variables have been disentangled: one with periods of less than 0.25 days (probably δ Scuti stars) and one with periods of greater than 0.025 days. The position in the H‐R diagram and the apparent timescale may suggest that the stars of the second group belong to a recently discovered new class of variables, named γ Dor variables. They certainly deserve further study. We also present a comparison between the results of the photometric survey and the available pointedROSATobservations of this cluster.
Publisher
The University of Chicago Press
