RR Lyrae stars in local group galaxies. I - NGC 185

Deep CCD images of NGC 185 taken with the '4-shooter' on the Hale 5-m telescope have been processed to find and photometrically measure RR Lyrae stars. 176 variable stars have been found, of which 151 are surmised to be RR Lyrae stars. Finding charts, periods, and light curves are presente...

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Bibliographic Details
Published in:The Astronomical journal 1990-01, Vol.99, p.97-148
Main Authors: Saha, A., Hoessel, John G.
Format: Article
Language:English
Subjects:
Astrophysics
CHARGE-COUPLED DEVICES
CHEMICAL COMPOSITION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONFIGURATION
DISTANCE
ELLIPTICAL CONFIGURATION
GALAXIES
GALAXY NUCLEI
GIANT STARS
IDENTIFICATION SYSTEMS
MILKY WAY
NEBULAE
PHOTOMETRY
PLANETARY NEBULAE
SEMICONDUCTOR DEVICES
STAR CLUSTERS
STARS 640102 > Astrophysics & Cosmology-- Stars & Quasi-Stellar, Radio & X-Ray Sources
VARIABLE STARS
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Summary:Deep CCD images of NGC 185 taken with the '4-shooter' on the Hale 5-m telescope have been processed to find and photometrically measure RR Lyrae stars. 176 variable stars have been found, of which 151 are surmised to be RR Lyrae stars. Finding charts, periods, and light curves are presented. The RR Lyrae stars in this galaxy have a very wide distribution of periods indicating a wide range of metallicity. The mean magnitudes of the RR Lyraes is determined to be 25.20 mag. A distance modulus of 23.79 is derived, based on the best currently available values of foreground extinction and mean absolute magnitudes of RR Lyrae stars.
ISSN:0004-6256
1538-3881
DOI:10.1086/115316