The variable stars in the globular cluster NGC 6642

Details The variable stars in the globular cluster NGC 6642 The variable stars in the globular cluster NGC 6642

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..557h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 557-562.

Astronomy and Astrophysics

Astronomy

3

Astronomical Photometry, Globular Clusters, Lyra Constellation, Metallicity, Variable Stars, Color-Magnitude Diagram, Electrophotometers, Galactic Clusters

Scientific paper

Photometry is presented for sixteen new and two previously discovered variables within the tidal radius of NGC 6642, and for eight new and three previously known variables outside the tidal radius. Of the former, ten have well-determined periods, indicating that they are RR Lyrae stars, and an additional seven are also probable RR Lyraes; most of these seem likely to be members of the cluster. An apparent visual distance modulus for NGC 6642 of 15.6 +/- 0.4 mag is derived. This value is 0.8 mag larger than the previous estimates. The RRc stars in the cluster show period shifts appropriate to its metallicity; the RRab stars show shifts corresponding to a somewhat lower metallicity.

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