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@Article{BragaCMFCMNZ:2019:NeTyII,
               author = "Braga, Vittorio F. and Contreras Ramos, R. and Minniti, Dante and 
                         Ferreira Lopes, Carlos Eduardo and Catelan, M{\'a}rcio and 
                         Minniti, J. H. and Nikzat, F. and Zoccali, M.",
          affiliation = "{Instituto Milenio de Astrof{\'{\i}}sica} and {Instituto Milenio 
                         de Astrof{\'{\i}}sica} and {Instituto Milenio de 
                         Astrof{\'{\i}}sica} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Milenio de Astrof{\'{\i}}sica} 
                         and {Instituto Milenio de Astrof{\'{\i}}sica} and {Instituto 
                         Milenio de Astrof{\'{\i}}sica} and {Instituto Milenio de 
                         Astrof{\'{\i}}sica}",
                title = "New type II cepheids from VVV data towards the galactic center",
              journal = "Astronomy and Astrophysics",
                 year = "2019",
               volume = "625",
                pages = "A151",
                month = "May",
             keywords = "stars: variables: Cepheids / Galaxy: bulge / Galaxy: center.",
             abstract = "Context. The Galactic center (GC) is the densest region of the 
                         Milky Way. Variability surveys towards the GC potentially provide 
                         the largest number of variable stars per square degree within the 
                         Galaxy. However, high stellar density is also a drawback due to 
                         blending. Moreover, the GC is affected by extreme reddening, 
                         therefore near infrared observations are needed. Aims. We plan to 
                         detect new variable stars towards the GC, focusing on type II 
                         Cepheids (T2Cs) which have the advantage of being brighter than RR 
                         Lyrae stars. Methods. We perform parallel Lomb-Scargle and 
                         Generalized Lomb-Scargle periodogram analysis of the Ks-band time 
                         series of the VISTA variables in the V{\'{\i}}a L{\'a}ctea 
                         survey, to detect periodicities. We employ statistical parameters 
                         to clean our sample. We take account of periods, light amplitudes, 
                         distances, and proper motions to provide a classification of the 
                         candidate variables. Results. We detected 1019 periodic variable 
                         stars, of which 164 are T2Cs, 210 are Miras and 3 are classical 
                         Cepheids. We also found the first anomalous Cepheid in this 
                         region. We compare their photometric properties with overlapping 
                         catalogs and discuss their properties on the color-magnitude and 
                         Bailey diagrams. Conclusions. We present the most extensive 
                         catalog of T2Cs in the GC region to date. Offsets in 
                         E(J\ \−\ Ks) and in the reddening law cause 
                         very large (\∼12 kpc) uncertainties on distances in this 
                         region. We provide a catalog which will be the starting point for 
                         future spectroscopic surveys in the innermost regions of the 
                         Galaxy.",
                  doi = "10.1051/0004-6361/201935103",
                  url = "http://dx.doi.org/10.1051/0004-6361/201935103",
                 issn = "0004-6361 and 1432-0746",
                label = "lattes: 4656875806985353 4 BragaCMFCMNZ:2019:NeTyII",
             language = "en",
           targetfile = "aa35103-19.pdf",
        urlaccessdate = "05 dez. 2020"
}


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