Author

A. Ferro

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Preprint Oct 2026

NGC 6426: Colour-Magnitude diagram and variable star population as indicators of metallicity, distance, and age

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 discussed, including four recently detected variables. The double mode nature of variables V3 and V9 is confirmed and their periods are calculate...

A. Ferro, R. Michel, D. Deras et al. · 0 citations

Preprint Sep 2026

A Homogenized Catalogue of Variable Stars in the Globular Cluster M22: Membership, Physical Parameters, and Distance

We present a photometric analysis of the variable stars in the field of the globular cluster M22 (NGC 6656), using time-series photometry from the literature and from OGLE and Gaia-DR3 data. From a sample of 666 variable stars in the field, we identify 94 as cluster members, including 10 RRab, 17 RRc, 2 Type II Cepheid...

M. A. Yepez, B. Moreno-Amaro, M. Ornelas-Castañeda et al. · 0 citations