Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Dékány, István"'
Autor:
Dékány, István, Grebel, Eva K.
RR Lyrae stars are useful chemical tracers thanks to the empirical relationship between their heavy-element abundance and the shape of their light curves. However, the consistent and accurate calibration of this relation across multiple photometric w
Externí odkaz:
http://arxiv.org/abs/2205.14471
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-series photometry and state-of-the-art high-resolution spectroscopic ab
Externí odkaz:
http://arxiv.org/abs/2107.05983
Autor:
Dékány, István, Grebel, Eva K.
Aiming to extend the census of RR Lyrae stars to highly reddened low-latitude regions of the central Milky Way, we performed a deep near-IR variability search using data from the VISTA Variables in the V\'ia L\'actea (VVV) survey of the bulge, analyz
Externí odkaz:
http://arxiv.org/abs/2006.09883
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 Galactic latitudes. Large time-domain photometric surveys operating in the
Externí odkaz:
http://arxiv.org/abs/1908.08290
Prompted by some inconsistencies in the photometry of the VISTA Variables in the V\'ia L\'actea (VVV) survey, we conduct a revision of the standard calibration procedure of VISTA data in the $J$, $H$, and $K_S$ passbands. Two independent sources of b
Externí odkaz:
http://arxiv.org/abs/1908.06160
Autor:
Dékány, István, Hajdu, Gergely, Grebel, Eva K., Catelan, Márcio, Elorrieta, Felipe, Eyheramendy, Susana, Majaess, Daniel, Jordán, Andrés
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 endemic to the Galactic plane, distant RRLs lying at low Galactic latitud
Externí odkaz:
http://arxiv.org/abs/1804.01457
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 Galactic bulge. With the aim of improving their near-infrared photometric
Externí odkaz:
http://arxiv.org/abs/1804.01456
Autor:
Navarrete, Camila, Catelan, Márcio, Ramos, Rodrigo Contreras, Alonso-García, Javier, Gran, Felipe, Dékány, István, Minniti, Dante
$\omega$ 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-field, near-infrared (IR) variability survey of $\omega$ Cen, using t
Externí odkaz:
http://arxiv.org/abs/1706.03899
Autor:
Minniti, Dante, Palma, Tali, Dékány, Istvan, Hempel, Maren, Rejkuba, Marina, Pullen, Joyce, Alonso-García, Javier, Barbá, Rodolfo, Barbuy, Beatriz, Bica, Eduardo, Bonatto, Charles, Borissova, Jura, Catelan, Marcio, Carballo-Bello, Julio A., Chene, Andre Nicolas, Clariá, Juan J., Cohen, Roger E., Contreras-Ramos, Rodrigo, Dias, Bruno, Emerson, Jim, Froebrich, Dirk, Buckner, Anne S. M., Geisler, Douglas, Gonzalez, Oscar A., Gran, Felipe, Hagdu, Gergely, Irwin, Mike, Ivanov, Valentin D., Kurtev, Radostin, Lucas, Philip W., Majaess, Daniel, Mauro, Francesco, Moni-Bidin, Christian, Navarrete, Camila, Alegría, Sebastian Ramírez, Saito, Roberto K., Valenti, Elena, Zoccali, Manuela
We use deep multi-epoch near-IR images of the VISTA Variables in the V\'ia L\'actea (VVV) Survey to search for RR Lyrae stars towards the Southern Galactic plane. Here we report the discovery of a group of RR Lyrae stars close together in VVV tile d0
Externí odkaz:
http://arxiv.org/abs/1703.02033
Autor:
Minniti, Dante, Dékány, Istvan, Majaess, Daniel, Palma, Tali, Pullen, Joyce, Rejkuba, Marina, Alonso-García, Javier, Catelan, Marcio, Ramos, Rodrigo Contreras, Gonzalez, Oscar A., Hempel, Maren, Irwin, Mike, Lucas, Philip W., Saito, Roberto K., Tissera, Patricia, Valenti, Elena, Zoccali, Manuela
Deep near-IR images from the VISTA Variables in the V\'ia L\'actea (VVV) Survey were used to search for RR Lyrae stars in the Southern Galactic plane. A sizable sample of 404 RR Lyrae of type ab stars was identified across a thin slice of the 4$^{\rm
Externí odkaz:
http://arxiv.org/abs/1703.01711