Browsing by Author "Ivanov, V."

Now showing 1 - 8 of 8
  • Thumbnail Image
    Item
    Confirmation of a galaxy cluster hidden behind the Galactic bulge using the VVV survey
    (2014) Coldwell, G.; Alonso, S.; Duplancic, F.; Hempel, Maren; Ivanov, V.; Minniti, D.
  • Thumbnail Image
    Item
    Discovery of a brown dwarf companion to the A3V star beta Circini
    (2015) Smith, L.; Lucas, P.; Pena, C.; Kurtev, R.; Marocco, F.; Jones, H.; Beamin Muhlenbrock, Juan Carlos; Napiwotzki, R.; Borissova, J.; Burningham, B.; Faherty, J.; Pinfield, D.; Gromadzki, M.; Ivanov, V.; Minniti, D.; Stimson, W.; Villanueva, V.
  • Thumbnail Image
    Item
    Ground-based transit observations of the super-Earth GJ 1214 b
    (2014) Caceres, C.; Kabath, P.; Hoyer, S.; Ivanov, V.; Rojo, P.; Girard, J.; Kempton, E.; Fortney, J.; Minniti, D.
  • Thumbnail Image
    Item
    New VVV Survey Globular Cluster Candidates in the Milky Way Bulge
    (2017) Minniti, D.; Geisler, D.; Alonso, J.; Palma, T.; Beamin, J.; Borissova, J.; Catelan, Márcio; Claria, J.; Hempel, Maren; Contreras Ramos, Rodrigo Andrés; Cohen, R.; Días, B.; Fernández, J.; Gómez, M.; Ivanov, V.; Kurtev, R.
  • Thumbnail Image
    Item
    Temperature constraints on the coldest brown dwarf known: WISE 0855-0714
    (2014) Beamin, J.; Ivanov, V.; Bayo, A.; Muzic, K.; Boffin, H.; Allard, F.; Homeier, D.; Minniti, D.
  • Thumbnail Image
    Item
    The Mass of the Most Massive Star in Stellar Clusters Determined from 25 Million MASSCLEAN Monte Carlo Simulations
    (2013) Popescu, Bogdan; Hanson, M. M.; Borissova, J.; Kurtev, R.; Ivanov, V.; Larsen, S. S.; Catelan, Marcio; Minniti, D.; Lucas, P.
    Is there a maximum universal stellar mass, or might the maximum stellar mass in a cluster be tied to the mass of the associated cluster? Direct measurements of the maximum stellar mass of hundreds of young stellar clusters would help us to answer this fundamental question. However, such information does not presently exist. We are mindful that the most massive star in a stellar cluster can have a strong influence on the integrated magnitudes and colors of their host stellar cluster, especially clusters in the low-mass range. Thinking strategically, this color variation provides us with a mechanism for divulging the properties of that most massive star. We performed 25 million MASSCLEAN Monte Carlo simulations of stellar clusters in the 200-1000 M_Sun range in the U, B, and V bands. These simulations were then used to estimate the mass of the most massive star for 40 young, low-mass LMC clusters. In a similar way, the integrated colors and magnitudes in VISTA's Z, Y, J, H, and Ks bands can also be used to estimate the mass of the most massive star in VISTA-identified stellar clusters. Is the IMF for one hundred young 1000 solar mass clusters the same at the high end as ten young 10,000 solar mass clusters? Using the VISTA's clusters, we intend to answer the question, "Does the lower mass of a stellar cluster artificially steepen the high-mass IMF?"....
  • No Thumbnail Available
    Item
    VISTA Variables in the Via Lactea (VVV): Current Status and First Results
    (2010) Saito, R.; Hempel, M.; Alonso-García, J.; Toledo, I.; Borissova, J.; González, O.; Beamin, J. C.; Minniti, D.; Lucas, P.; Emerson, J.; Ahumada, A.; Aigrain, S.; Alonso, M. V.; Amôres, E.; Angeloni, R.; Arias, J.; Bandyopadhyay, R.; Barbá, R.; Barbuy, B.; Baume, G.; Bedin, L.; Bica, E.; Bronfman, L.; Carraro, G.; Catelan, Marcio; Clariá, J.; Contreras, C.; Cross, N.; Davis, C.; de Grijs, R.; Dékány, I.; Janet Drew, J. D.; Fariña, C.; Feinstein, C.; Fernández Lajús, E.; Folkes, S.; Gamen, R.; Geisler, D.; Gieren, W.; Goldman, B.; Gosling, A.; Gunthardt, G.; Gurovich, S.; Hambly, N.; Hanson, M.; Hoare, M.; Irwin, M.; Ivanov, V.; Jordán, A.; Kerins, E.; Kinemuchi, K.; Kurtev, R.; Longmore, A.; López-Corredoira, M.; Maccarone, T.; Martín, E.; Masetti, N.; Mennickent, R.; Merlo, D.; Messineo, M.; Mirabel, F.; Monaco, L.; Moni Bidin, C.; Morelli, L.; Padilla, N.; Palma, T.; Parisi, M. C.; Parker, Q.; Pavani, D.; Pietrukowicz, P.; Pietrzynski, G.; Pignata, G.; Rejkuba, M.; Rojas, A.; Roman Lopes, A.; Ruiz, M. T.; Sale, S.; Saviane, I.; Schreiber, M.; Schröder, A.; Sharma, S.; Smith, M.; Sodré, L., Jr.; Soto, M.; Stephens, A.; Tamura, M.; Tappert, C.; Thompson, M.; Valenti, E.; Vanzi, L.; Weidmann, W.; Zoccali, M.
    VISTA Variables in the Vía Láctea (VVV) is a public ESO near-IR variability survey aimed at scanning the Milky Way Bulge and an adjacent section of the mid-plane. VVV observations started in October 2009 during ESO science verification. Regular observations for the first year of the survey have been conducted since February 2010 and will cover a total area of 520 square degrees in five passbands and five epochs. Here we address the first results obtained from the VVV Survey as well as the current status of the observations....
  • No Thumbnail Available
    Item
    VVV Pointed Search for New Galactic Open Clusters
    (2011) Borissova, J.; Kurtev, R.; Peñaloza, F.; Bonatto, C.; Folkes, S. L.; Sale, S. E.; Clarke, J.; Minniti, D.; Catelan, Marcio; Hempel, M.; Toledo, I.; Saito, R.; Ivanov, V.; Chene, A. N.; Geisler, D.; Bica, E.
    We are reporting the discovery of 96 new infrared open clusters and stellar groups, found using in the disk area of the ``VVV-Vista Variables in the Via Lactea'' ESO Large Survey. Our search focused on the directions of known star formation regions, masers, radio and infrared sources....