20 citations · 63 across the 10 of their papers we have counts for
11 papers
NGC 6426: Colour-Magnitude diagram and variable star population as indicators of metallicity, distance, and age
A. Arellano Ferro, R. Michel, D. Deras +3
We present new VI CCD photometry of the globular cluster NGC 6426. The membership status of all point sources and, in particular, of all the variables in the field of view is discu…
The variable stars in the compact halo globular cluster NGC 5634 visited again
A. Arellano Ferro, R. Michel, M. A. Yepez +3
We present new time-series CCD \emph{VR} photometry of the globular cluster NGC 5634. We aim to use the known RR Lyrae stars, members of the cluster, as indicators of mean metallic…
Long term CCD photometry of the distant cluster NGC 2419: the CMD revisited
A. Arellano Ferro, S. Muneer, Sunetra Giridhar +4
Employing \emph{VI} images of NGC 2419 acquired over 17 years, light curves for most of the known variables in the field of the cluster are produced. A cluster membership analysis…
The variable stars in the field of NGC 6139: A critical approach to their reddening and membership
M. A. Yepez, A. Arellano Ferro, I. Bustos Fierro +1
We present a CCD time-series analysis of the globular cluster NGC 6139 and its variable star population. Using the astrometric data available in -DR3 we performed a memb…
RR Lyrae stars in the globular cluster Palomar 2
A. Arellano Ferro, I. Bustos Fierro, S. Muneer +1
A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-…
A new visit to the variable stars in M56 and its colour magnitude diagram structure
D. Deras, A. Arellano Ferro, I. Bustos Fierro +1
We present a CCD photometric study and a membership analysis of the globular cluster M56 (NGC 6779). This produced a decontaminated CMD from field stars, which enabled a bette…
A new photometric study of M14 (NGC 6402): An interpretation of the Horizontal Branch and beyond
M. A. Yepez, A. Arellano Ferro, D. Deras +3
We present a CCD photometric study of the globular cluster M14. Particular attention is given to the variable stars. This allowed new classifications and cluster membership co…
A time-series VI study of the variable stars of the globular cluster NGC 6397
J. A. Ahumada, A. Arellano Ferro, I. Bustos Fierro +4
We present a new time-series VI CCD photometry of the globular cluster NGC 6397, from which we obtained and analysed the light curves of 35 variables carefully identified in the cl…
NGC 1261: A time-series \emph{VI} study of its variable stars
A. Arellano Ferro, I. H. Bustos Fierro, J. H. Calderón +1
Time-series \emph{VI} CCD photometry of the globular cluster NGC 1261 is employed to study its variable star population. A membership analysis of most variables based on Gaia~DR2 p…
Extraction of globular clusters members with Gaia DR2 astrometry
I. H. Bustos Fierro, J. H. Calderón
In this work we present a method to identify possible members of globular clusters using data from Gaia DR2. The method consists of two stages: the first one based on a clustering…
Metallicity and distance of NGC 6362 from its RR Lyrae and SX Phoenicis stars
A. Arellano Ferro, J. A. Ahumada, I. H. Bustos Fierro +2
New time-series VI CCD photometry of the globular cluster NGC 6362 is studied with the aim of estimating the reddening, mean metallicity and distance of the cluster from its popula…