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Metallicity estimation of RR Lyrae stars from their I-band light curves
István Dékány, Eva K. Grebel, Grzegorz Pojmański
We have revisited the problem of metallicity prediction of RR Lyrae stars from their near-infrared light curves in the Cousins I waveband. Our study is based on high-quality time-s…
Into the Darkness: Classical and Type II Cepheids in the Zona Galactica Incognita
István Dékány, Gergely Hajdu, Eva K. Grebel +1
The far side of the Milky Way's disk is one of the most concealed parts of the known Universe due to extremely high interstellar extinction and point source density toward low Gala…
On the Oosterhoff dichotomy in the Galactic bulge: I. spatial distribution
Z. Prudil, I. Dékány, M. Catelan +3
We present a study of the Oosterhoff (Oo) dichotomy in the Galactic bulge using 8\,141 fundamental mode RR~Lyrae stars. We used public photometric data from the Optical Gravitation…
A Near-infrared RR Lyrae census along the southern Galactic plane: the Milky Way's stellar fossil brought to light
István Dékány, Gergely Hajdu, Eva K. Grebel +5
RR Lyrae stars (RRLs) are tracers of the Milky Way's fossil record, holding valuable information on its formation and early evolution. Owing to the high interstellar extinction end…
A Data-driven Study of RR Lyrae Near-IR Light Curves: Principal Component Analysis, Robust Fits, and Metallicity Estimates
Gergely Hajdu, István Dékány, Márcio Catelan +2
RR~Lyrae variables are widely used tracers of Galactic halo structure and kinematics, but they can also serve to constrain the distribution of the old stellar population in the Gal…
Pulsating stars in Centauri: Near-IR properties and period-luminosity relations
Camila Navarrete, Márcio Catelan, Rodrigo Contreras Ramos +4
Centauri (NGC~5139) contains many variable stars of different types, including the pulsating type II Cepheids, RR Lyrae and SX Phoenicis stars. We carried out a deep, wide-fiel…