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RR Lyrae Stars in the Globular NGC 3201: Light Curves, Reddening, and Distance

Published online by Cambridge University Press:  12 April 2016

Andrew Layden
Andrew Layden*
Affiliation:
Bowling Green State University, USAe-mail:layden@baade.bgsu.edu

Extract

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RR Lyrae stars (RRL) are a favourite standard candle for globular clusters and other old stellar populations, yet recent absolute magnitude calibrations, MV(RR), span more than 0.2 mag. Precise distance estimates for nearby globular clusters will eventually be available through satellite-based trigonometric parallaxes (Layden, these proceedings), thus providing a resolution to this old problem.

Here, we present a progress report on our high quality time-series photometry of RRL in the nearby globular cluster NGC 3201 - the first obtained for this cluster with a CCD. The resulting light curves provide accurate intensity-mean apparent magnitudes and reddening estimates, which will in turn be used to calibrate MV(RR) once a satellite-based parallax for NGC 3201 is available.

Type
Part 1.3. Stellar Pulsation and the Distance Scale
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 122 - 123
Copyright
Copyright © Astronomical Society of the Pacific 2002

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