Now showing items 1-15 of 15

    • A Benchmark White Dwarf-Ultracool Dwarf Wide Field Binary 

      Ferreira, Thiago; Saito, Roberto K.; Minniti, Dante; Mejías, Andrea; Caceres, Claudio; Alonso-García, Javier; Beamín, Juan Carlos; Smith, Leigh C.; Gomez, Matías; Lucas, Philip W.; Ivanov, Valentin D. (2023-12-19)
      We present the discovery and multi-wavelength characterisation of VVV J1438-6158 AB, a new field wide-binary system consisting of a 4.6(+5.5-2.4) Gyr and Teff = 9500+/-125 K DA white dwarf (WD) and a Teff = 2400+/-50 K M8 ...
    • The Emergence of the Infrared transient VVV-WIT-06 

      Minniti, Dante; Saito, Roberto K.; Forster, F.; Pignata, G.; Ivanov, Valentin D.; Lucas, Philip; Beamin, J.C.; Borissova, Jura; Catelan, Marcio; Gonzalez, Oscar A.; Hempel, Maren; Hsiao, E; Kurtev, Radostin; Majaess, Daniel; Masetti, N.; Morrell, N.I.; Phillips, M.M.; Pullen, J. B.; Rejkuba, M.; Smith, L.C.; Surot, F.; Valenti, Elena; Zoccali, Manuela (2017-11-03)
      We report the discovery of an enigmatic large-amplitude (ΔKs> 10.5 mag) transient event in near-IR data obtained by the VISTA Variables in the Via Lactea (VVV) ESO Public Survey. The object (designated VVV-WIT-06) is located ...
    • FSR 1716: A new Milky Way Globular Cluster confirmed using VVV RR Lyrae stars 

      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 (2017-03-24)
      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 ...
    • New VVV Survey Globular Cluster Candidates in the Milky Way Bulge 

      Minniti, Dante; Geisler, Douglas; Alonso-García, Javier; Palma, Tali; Beamin, Juan Carlos; Borissova, Jura; Catelan, Marcio; Clariá, Juan J.; Cohen, Roger E.; Ramos, Rodrigo Contreras; Dias, Bruno; Fernandez-Trincado, Jose; Gomez, Matias; Hempel, Maren; Ivanov, Valentin D.; Kurtev, Radostin; Lucas, Philip; Moni-Bidin, Christian; Pullen, Joyce; Alegría, Sebastian Ramírez; Saito, Roberto K.; Valenti, Elena (2017-11-10)
      It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the Galactic bulge. High stellar density combined with high and differential interstellar reddening are the two major ...
    • Open cluster candidates in the VVVX area: VVVX CL 076 and CL 077 

      Borissova, Jura; Ivanov, Valentin D.; Lucas, Philip; Kurtev, R.; Alonso-Garcia, J.; Alegria, S. Ramirez; Minniti, D.; Medina, Nicolás; Chene, Andre Nicolas (2019-08-01)
      We are reporting some basic parameters of two newly discovered clusters, VVVX CL 076 and CL 077, recently discovered in the galactic disk area covered by the VISTA Variables in the Via Lactea eXtended (VVVX) ESO Public ...
    • Searching for Faint Comoving Companions to the α Centauri system in the VVV Survey Infrared Images 

      Beamin, J.C.; Minniti, D.; Pullen, J. B.; Ivanov, Valentin D.; Bendek, E.; Bayo, A.; Gromadzki, M.; Kurtev, R.; Lucas, P. W.; Butler, R. P. (2017-12-21)
      The VVV survey has observed the southern disk of the Milky Way in the near infrared, covering 240 deg$^{2}$ in the $ZYJHK_S$ filters. We search the VVV Survey images in a $\sim$19 deg$^{2}$ field around $\alpha$ Centauri, ...
    • The VMC survey - XII : Star cluster candidates in the large magellanic cloud 

      Piatti, Andrés E.; Guandalini, Roald; Ivanov, Valentin D.; Rubele, Stefano; Cioni, M-R.L.; De Grijs, Richard; For, Bi Qing; Clementini, Gisella; Ripepi, Vincenzo; Anders, Peter; Oliveira, Joana M. (2014-10)
      In this work we analyse colour-magnitude diagrams (CMDs) of catalogued star clusters located in the Large Magellanic Cloud (LMC), from a YJKs photometric data set obtained by the Visible and Infrared Survey Telescope for ...
    • The VMC Survey - XIII : Type II Cepheids in the Large Magellanic Cloud 

      Ripepi, V.; Moretti, M.I.; Marconi, M.; Clementini, G.; Cioni, M-R.L.; de Grijs, R.; Emerson, J.P.; Groenewegen, M.A.T.; Ivanov, Valentin D.; Muraveva, T.; Piatti, A.E.; Subramanian, S. (2015-01-21)
      The VISTA (Visible and Infrared Survey Telescope for Astronomy) survey of the Magellanic Clouds System (VMC) is collecting deep Ks-band time-series photometry of the pulsating variable stars hosted in the system formed by ...
    • The VMC survey - XIV : First results on the look-back time star formation rate tomography of the Small Magellanic Cloud 

      Rubele, S.; Girardi, L.; Kerber, L.; Cioni, M-R.L.; Piatti, A.E.; Zaggia, S.; Bekki, K.; Bressan, A.; Clementini, G.; de Grijs, R.; Emerson, J.P.; Groenewegen, M.A.T.; Ivanov, Valentin D.; Marconi, M.; Marigo, P.; Moretti, M.I.; Ripepi, V.; Subramanian, S.; Tatton, B.L.; van Loon, J. Th (2015-05-01)
      We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJKs filters, covering 14 deg2 (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). ...
    • The VMC survey - XVI : Spatial variation of the cluster-formation activity in the innermost regions of the Large Magellanic Cloud 

      Piatti, Andrés E.; De Grijs, Richard; Ripepi, V.; Ivanov, Valentin D.; Cioni, M-R.L.; Marconi, M.; Rubele, S.; Bekki, K.; For, Bi-Qing (2015-11-21)
      We present results based on YJKs photometry of star clusters in the Large Magellanic Cloud (LMC), distributed throughout the central part of the galaxy's bar and the 30 Doradus region. We analysed the field-star-decontaminated ...
    • The VMC survey - XVII : The proper motions of the Small Magellanic Cloud and the Milky Way globular cluster 47 Tucanae 

      Cioni, M-R.L.; Bekki, K.; Girardi, L.; De Grijs, Richard; Irwin, M.; Ivanov, Valentin D.; Marconi, M.; Oliveira, Joana M.; Piatti, Andrés E.; Ripepi, V.; van Loon, J. Th (2016-01-28)
      In this study we use multi-epoch near-infrared observations from the VISTA survey of the Magellanic Cloud system (VMC) to measure the proper motion of different stellar populations in a tile of 1.5 deg sq. in size in the ...
    • The VMC survey - XVIII : Radial dependence of the low-mass, 0.57-0.82 Msun stellar mass function in the galactic globular cluster 47 Tucanae 

      Chaoli, Zhang; Li, Chengyuan; De Grijs, Richard; Bekki, K.; Deng, Licai; Zaggia, S.; Rubele, S.; Piatti, Andrés E.; Cioni, M-R.L.; Emerson, J.P.; For, Bi-Qing; Ripepi, V.; Marconi, Marcella; Ivanov, Valentin D.; Chen, Li (2015-12-14)
      We use near-infrared observations obtained as part of the Visible and Infrared Survey Telescope for Astronomy (VISTA) Survey of the Magellanic Clouds (VMC), as well as two complementary Hubble Space Telescope (HST) data ...
    • The VMC Survey - XXI. New star cluster candidates discovered from infrared photometry in the Small Magellanic Cloud 

      Piatti, Andrés E.; Ivanov, Valentin D.; Rubele, Stefano; Marconi, Marcella; Ripepi, Vincenzo; Cioni, Maria Rosa L; Oliveira, Joana M.; Bekki, Kenji (2016-07-21)
      We report the first search for new star clusters performed using the VISTA near-infrared YJKs Magellanic Clouds survey (VMC) data sets. We chose a pilot field of ~0.4 deg2 located in the South-west of the Small Magelllanic ...
    • VVV-WIT-04: an extragalactic variable source caught by the VVV Survey 

      Saito, Roberto K.; Minniti, Dante; Ivanov, Valentin D.; Masetti, Nicola; Navarro, Maria Gabriela; Fernandes, Roberto Cid; Ruschel-Dutra, Daniel; Smith, Leigh C.; Lucas, Philip W.; Gonzalez-Fernandez, Carlos; Ramos, Rodrigo Contreras (2019-09-20)
      We report the discovery of VVV-WIT-04, a near-infrared (near-IR) variable source towards the Galactic disc located ∼0.2 arcsec apart from the position of the radio source PMN J1515−5559. The object was found serendipitously ...
    • VVV-WIT-08: the giant star that blinked 

      Smith, Leigh C.; Koposov, Sergey E.; Lucas, Philip W.; Sanders, Jason L.; Minniti, Dante; Udalski, Andrzej; Evans, N. Wyn; Aguado, David; Ivanov, Valentin D.; Saito, Roberto K.; Fraga, Luciano; Pietrukowicz, Pawel; Penoyre, Zephyr; González-Fernández, Carlos (2021-06-11)
      We report the serendipitous discovery of a late-type giant star that exhibited a smooth, eclipse-like drop in flux to a depth of 97 per cent. Minimum flux occurred in April 2012 and the total event duration was a few hundred ...