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Physical parameters of RR Lyrae stars in NGC 6171
D. Deras, A. Arellano Ferro, S. Muneer +2
We present an analysis of VI CCD time-series photometry of the globular cluster NGC 6171. The main goal is to determine individual physical parameters for single-mode RR Lyrae star…
Chemical composition of two bright extremely metal-poor stars from the SDSS MARVELS pre-survey
Avrajit Bandyopadhyay, Sivarani Thirupathi, Antony Susmitha +4
\sdsszeroeight\ (V = 11.4; [Fe/H] = 3.1) and \sdssonethree\ (V = 12.4; [Fe/H] = 3.2) were observed with the SDSS 2.5-m telescope as part of the SDSS-MARVELS spectroscopic pre…
Variable stars in NGC 4147 revisited: RR Lyrae stars new CCD VI photometry and physical parameters
A. Arellano Ferro, F. C. Rojas Galindo, S. Muneer +1
We have calculated the physical parameters of the RR Lyrae stars in the globular cluster NGC~4147 via the Fourier decomposition of their light curves, using new data and well-estab…
Period changes in the RR Lyrae stars of NGC 6171 (M107)
A. Arellano Ferro, P. Rosenzweig, A. Luna +4
Based on photometric data obtained between 1935 and 2017, diagrams were built for 22 RR Lyrae stars in the globular cluster NGC 6171, leading to the discovery of secular peri…