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Metallicity Gradients in M 31, M 33, NGC 300 and the Milky Way Using Abundances of Different Elements

Peña, M.; Flores-Durán, S. N.

Metallicity gradients derived from planetary nebulae (PNe) using O, Ne, and Ar abundances are studied and compared to those from H II regions in the galaxies M 31, M 33, NGC 300 and the Milky Way. Galactocentric radii and chemical abundances were collected from the literature, carefully selecting a homogeneous sample for each galaxy. Metallicity g…

NGC 1261: A Time-Series VI Study of its Variable Stars

Arellano Ferro, A.; Calderón, J. H.; Bustos Fierro, I. H. +1 more

Time-series 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 proper motions and colours was performed prior to the estimation of the mean cluster distance and metallicity. The light curves of the member RR Lyrae were Fourier decomposed to…