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Artículo

New variable stars discovered in the fields of three Galactic open clusters using the VVV survey

Palma, TaliIcon ; Minniti, Dante; Dékány, I.; Clariá, Juan JoséIcon ; Alonso García, J.; Gramajo, Luciana VeronicaIcon ; Ramírez Alegría, S.; Bonatto, C.
Fecha de publicación: 11/2016
Editorial: Elsevier Science
Revista: New Astronomy
ISSN: 1384-1076
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

This project is a massive near-infrared (NIR) search for variable stars in highly reddened and obscured open cluster (OC) fields projected on regions of the Galactic bulge and disk. The search is performed using photometric NIR data in the J-, H- and Ks- bands obtained from the Vista Variables in the Vía Láctea (VVV) Survey. We performed in each cluster field a variability search using Stetson's variability statistics to select the variable candidates. Later, those candidates were subjected to a frequency analysis using the Generalized Lomb-Scargle and the Phase Dispersion Minimization algorithms. The number of independent observations range between 63 and 73. The newly discovered variables in this study, 157 in total in three different known OCs, are classified based on their light curve shapes, periods, amplitudes and their location in the corresponding color-magnitude (J−Ks,Ks) and color-color (H−Ks,J−H) diagrams. We found 5 possible Cepheid stars which, based on the period-luminosity relation, are very likely type II Cepheids located behind the bulge. Among the newly discovered variables, there are eclipsing binaries, δ Scuti, as well as background RR Lyrae stars. Using the new version of the Wilson & Devinney code as well as the “Physics Of Eclipsing Binaries” (PHOEBE) code, we analyzed some of the best eclipsing binaries we discovered. Our results show that these studied systems turn out to be ranging from detached to double-contact binaries, with low eccentricities and high inclinations of approximately 80°. Their surface temperatures range between 3500 K and 8000 K.
Palabras clave: Antalova&Nbsp;1 , Ascc&Nbsp;90 , Eso&Nbsp;393-15 &Ndash; Stars , Galaxy , General , Individual , Stellar Content &Ndash; Open Clusters And Associations , Variables
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/72310
URL: https://www.sciencedirect.com/science/article/pii/S138410761630032X
DOI: https://doi.org/10.1016/j.newast.2016.05.008
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Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Palma, Tali; Minniti, Dante; Dékány, I.; Clariá, Juan José; Alonso García, J.; et al.; New variable stars discovered in the fields of three Galactic open clusters using the VVV survey; Elsevier Science; New Astronomy; 49; 11-2016; 50-62
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