27 citations · 58 across the 4 of their papers we have counts for
12 papers
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…
A new, Gaia based, catalogue of blue straggler stars in open clusters
M. J. Rain, J. Ahumada, G. Carraro
Blue straggler stars are exotic objects present in all stellar environments whose nature and formation channels are still partially unclear. They seem to be particularly abundant i…
Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
Á. Llancaqueo Albornoz, S. Villanova, C. C. Cortés +2
We present the analysis of 34 light curves in and of 17 giant stars in the globular cluster NGC 3201, to check if such stars are variable and if their variability has some…
The blue straggler population of the open clusters Trumpler 5, Trumpler 20, and NGC 2477
M. J Rain, G. Carraro, J. Ahumada +3
We present a study, based on Gaia DR2, of the population of blue straggler stars (BSS) in the open clusters Trumpler 5, Trumpler 20, and NGC 2477. All candidates were selected acco…
A study of the blue straggler population of the old open cluster Collinder 261
M. J. Rain, G. Carraro, J. A. Ahumada +4
Blue Stragglers are stars located in an unexpected region of the color-magnitude diagram of a stellar population, as they appear bluer and more luminous than the stars in the turno…
Hunting white dwarfs at the center of planetary nebulae
Javier Ahumada, Walter Weidmann, Marcelo Miller Bertolami +1
We present Gemini-South observations of nine faint and extended planetary nebulae. Using direct images taken with the spectrograph GMOS, we built the vs. di…