The RR Lyrae stars in and around the LMC globular cluster NGC 2257

Details The RR Lyrae stars in and around the LMC globular cluster NGC 2257 The RR Lyrae stars in and around the LMC globular cluster NGC 2257

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...57..287n&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 57, Feb. 1985, p. 287-328.

Astronomy and Astrophysics

Astrophysics

34

Globular Clusters, Magellanic Clouds, Variable Stars, Light Curve, Photographic Plates, Stellar Color, Stellar Magnitude, Stellar Spectrophotometry, Tables (Data)

Scientific paper

The RR Lyrae stars in and within 25 arcmin of the LMC halo globular cluster NGC 2257 are identified and photometrically studied. Iris, PDS, and visual photometry is presented of photographic plates taken at CTIO during 1971-82 are presented. The pulsation properties of the cluster and field variables are derived and compared with those of RR Lyrae stars in the Galaxy. The plate material and data analysis are described and the photometry is used to derive periods, light curves, epochs of maximum light, etc., for 38 of the 41 cluster RR Lyrae stars and for 23 of 47 suspected variables in the surrounding field. Correlations involving these observations are presented and discussed.

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