SX Phoenecis Stars in the Extremely Metal-Poor Globular Clusters NGC 5053

Astronomy and Astrophysics – Astronomy

Scientific paper

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Globular Clusters: Individual: Ngc 5053, Stars: Early-Type

Scientific paper

The results of a major search for photometrically variable blue straggler stars (BSs) in the extremely metal-poor globular cluster NGC 5053 are presented. The survey is based on photometry of over 200 CCD frames (BVI passbands) taken on 18 nights between 1985 and 1994. Five of the 16 BSs monitored for variability are identified as SX Phe stars and their photometric characteristics derived. These five stars are among the shortest-period (49

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