The variable stars in the globular cluster NGC 6139

Details The variable stars in the globular cluster NGC 6139 The variable stars in the globular cluster NGC 6139

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..170h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 170-174. Research supported by Harvard College Observatory.

Astronomy and Astrophysics

Astronomy

7

Blue Stars, Giant Stars, Globular Clusters, Stellar Spectrophotometry, Variable Stars, Light Curve, Metallicity, Stellar Magnitude

Scientific paper

Photometry is presented for ten new variables within the tidal radius of NGC 6139 and for six new variables outside the tidal radius. Of the former, five have periods indicating they are probable RR Lyrae stars; these variables seem likely to be members of the cluster. An apparent visual distance modulus for NGC 6139 of 17.2 + or - 0.4 mag is derived. The RR Lyrae stars in the cluster show period shifts appropriate to a cluster of considerably low metallicity than has been observed for NGC 6139.

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