@Article{HerpichLoSaMiEdFeCa:2021:VVSuNe,
               author = "Herpich, F{\'a}bio R. and Lopes, Carlos Eduardo Ferreira and 
                         Saito, R. K. and Minniti, D. and Ederoclite, A. and Ferreira, T. 
                         S. and Catelan, M.",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal de Santa 
                         Catarina (UFSC)} and {Universidad Andres Bello} and {Universidade 
                         de S{\~a}o Paulo (USP)} and {Universidade Federal de Santa 
                         Catarina (UFSC)} and {Universidad Cat{\'o}lica de Chile}",
                title = "VVV survey near-infrared colour catalogue of known variable 
                         stars",
              journal = "Astronomy \& Astrophysics",
                 year = "2021",
               volume = "647",
                pages = "A169",
                month = "Mar.",
             keywords = "stars: variables: general – surveys – Galaxy: bulge – Galaxy: 
                         disk.",
             abstract = "Context. The Vista Variables in the Via Lactea (VVV) near-infrared 
                         variability survey explores some of the most complex regions of 
                         the Milky Way bulge and disk in terms of high extinction and high 
                         crowding. Aims. We add a new wavelength dimension to the optical 
                         information available at the American Association of Variable Star 
                         Observers International Variable Star Index (VSX-AAVSO) catalogue 
                         to test the VVV survey near-infrared photometry to better 
                         characterise these objects. Methods. We cross-matched the VVV and 
                         the VSX-AAVSO catalogues along with Gaia Data Release 2 photometry 
                         and parallax. Results. We present a catalogue that includes 
                         accurate individual coordinates, near-infrared magnitudes 
                         (ZYJHKs), extinctions AKs, and distances based on Gaia parallaxes. 
                         We also show the near-infrared CMDs and spatial distributions for 
                         the different VSX types of variable stars, including important 
                         distance indicators, such as RR Lyrae, Cepheids, and Miras. By 
                         analysing the photometric flags in our catalogue, we found that 
                         about 20% of the stars with measured and verified variability are 
                         flagged as non-stellar sources, even when they are outside of the 
                         saturation and/or noise regimes. Additionally, we pair-matched our 
                         sample with the VIVA catalogue and found that more than half of 
                         our sources are missing from the VVV variability list, mostly due 
                         to observations with low signal-to-noise ratio or photometric 
                         problems with a low percentage due to failures in the selection 
                         process. Conclusions. Our results suggest that the current 
                         knowledge of the variability in the Galaxy is biased to nearby 
                         stars with low extinction. The present catalogue also provides the 
                         groundwork for characterising the results of future large 
                         variability surveys such as the Vera C. Rubin Observatory Legacy 
                         Survey of Space and Time in the highly crowded and reddened 
                         regions of the Galactic plane, as well as follow-up campaigns for 
                         characterising specific types of variables. The analysis of the 
                         incorrectly flagged stars can be used to improve the photometric 
                         classification of the VVV data, allowing us to expand the amount 
                         of data considered useful for science purposes. In addition, we 
                         provide a list of stars that are missed by the VIVA procedures for 
                         which the observations are good and which were missed due to some 
                         failure in the VIVA selection process.",
                  doi = "10.1051/0004-6361/201834356",
                  url = "http://dx.doi.org/10.1051/0004-6361/201834356",
                 issn = "0004-6361 and 1432-0746",
             language = "en",
           targetfile = "herpich_vvv.pdf",
        urlaccessdate = "09 maio 2024"
}