The variable stars in the field of the globular cluster NGC 6569

Details The variable stars in the field of the globular cluster NGC 6569 The variable stars in the field of the globular cluster NGC 6569

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1807h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Sept. 1985, p. 1807-1811. Research supported by the Harvard College Observatory.

Astronomy and Astrophysics

Astronomy

12

Astronomical Photometry, Globular Clusters, Variable Stars, Cepheid Variables, Distance, Metallicity, Stellar Magnitude

Scientific paper

Photometry is presented for 17 new and six previously discovered variables within the tidal radius of NGC 6569. Twenty new and two previously discovered field variables are also studied. A distance of 7.9±1.5 kpc is derived for the cluster. NGC 6569, a bulge cluster, appears to have an unusually blue horizontal branch for its metallicity; one possible explanation is that it is older than its counterparts in the galactic halo.

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