A W UMa Contact Binary in the Globular Cluster NGC 6397

Details A W UMa Contact Binary in the Globular Cluster NGC 6397 A W UMa Contact Binary in the Globular Cluster NGC 6397

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111..260r&link_type=abstract

Astronomical Journal v.111, p.260

Astronomy and Astrophysics

Astronomy

18

Globular Clusters: Individual: Ngc 6397, Binaries: Close

Scientific paper

We report the identification of a W UMa contact binary ≲2' from the center of the metal-poor core-collapse globular cluster NGC 6397. The photometric properties of this binary system are consistent with cluster membership. The orbital period is 0.27 days. Fits to theoretical models suggest that the total mass of the system is likely to be greater than the mass of main-sequence turnoff stars. Moreover, since this system is losing angular momentum it will ultimately coalesce and may become a blue straggler. None of the other ≍3000 cluster members observed, including 14 blue stragglers for which there are time series data, showed significant variability.

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