Browsing by Author "Ivanov, V. D."

Now showing items 1-14 of 14

    • Assessing the stellar population and the environment of an HII region on the far side of the Galaxy 

      Chené, A. -N.; Benjamin, R. A.; Alegría, S. Ramírez; Borissova, J.; Kurtev, R.; Bidin, C. Moni; Mauro, F.; Lucas, P.; Guo, Z.; Smith, L. C.; Gonzalez-Fernandez, C.; Ivanov, V. D.; Minniti, D.; Anderson, L. D.; Armentrout, W. P.; Gonzalez, D.; Herrero, A.; Ramírez, K. Peña (2021-04-20)
      We have investigated the stellar and interstellar content of the distant star formation region IRAS 17591-2228 (WISE HII region GAL 007.47+0.06). It is associated to a water maser, whose parallax distance is d=20.4^{+2.8} ...

    • Discovery of a mid-infrared protostellar outburst of exceptional amplitude 

      Lucas, P. W.; Elias, Jay; Points, Sean; Guo, Z.; Stecklum, B.; Vorobyov, E.; Morris, C.; Borissova, J.; Kurtev, R.; Pena, C. Contreras; Medina, N.; Minniti, D.; Ivanov, V. D.; Saito, R. K. (2020-09-23)
      We report the discovery of a mid-infrared outburst in a Young Stellar Object (YSO) with an amplitude close to 8 mag at lambda ~ 4.6 microns. WISEA J142238.82-611553.7 is one of 23 highly variable WISE sources discovered ...

    • Discovery of a new Y dwarf: WISE J030449.03-270508.3 

      Pinfield, D.J.; Gromadzki, M.; Leggett, S.K.; Gomes, J.; Lodieu, N.; Kurtev, R.; Day-Jones, A. C.; Ruiz, M. T.; Cook, N. J.; Morley, C.V.; Marley, M. S.; Marocco, F.; Smart, R.L.; Jones, H.R.A.; Lucas, P.W.; Beletsky, Y.; Ivanov, V. D.; Burningham, B.; Jenkins, J. S.; Cardoso, C.; Frith, J.; Clarke, J. R. A.; Gálvez-Ortiz, M. C.; Zhang, Z. (2014-10-21)
      We present a new Y dwarf, WISE J030449.03−270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec ...

    • High contrast imaging at ten microns, a search for exoplanets around: Eps Indi A, Eps Eri, Tau Ceti, Sirius A and Sirius B 

      Pathak, P.; Roche, D. J. M. Petit dit de la; Kasper, M.; Sterzik, M.; Absil, O.; Boehle, A.; Feng, F.; Ivanov, V. D.; Janson, M.; Jones, H. R. A.; Kaufer, A.; Käufl, H. -U.; Maire, A. -L.; Meyer, M.; Pantin, E.; Siebenmorgen, R.; Ancker, M. E. van den; Viswanath, G. (2021-08-18)
      The direct imaging of rocky exoplanets is one of the major science goals for upcoming large telescopes. The contrast requirement for imaging such planets is challenging. However, the mid-IR (InfraRed) regime provides the ...

    • The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others 

      Lucas, P. W.; Smith, L. C.; Guo, Z.; Peña, C. Contreras; Minniti, D.; Miller, N.; Alonso-García, Javier; Catelan, M.; Borissova, J.; Saito, R. K.; Kurtev, R.; Navarro, M. G.; Morris, C.; Muthu, H.; Froebrich, D.; Ivanov, V. D.; Bayo, A.; Garatti, A. Caratti o; Sanders, J. L. (2024-02-01)
      We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young ...

    • New Galactic star clusters discovered in the disc area of the VVVX survey 

      Borissova, J.; Ivanov, V. D.; Lucas, P. W.; Kurtev, R.; Alonso-Garcia, J.; Alegria, S. Ramirez; Minniti, D.; Hempel, M.; Medina, N.; Chene, A. N.; Kuhn, M. A. (2018-12-11)
      The "VISTA Variables in the Via Lactea eXtended (VVVX)" ESO Public Survey is a near-infrared photometric sky survey that covers nearly 1700 sq. deg towards the Galactic disk and bulge. It is well-suited to search for new ...

    • New Galactic star clusters discovered in the VVV survey 

      Borissova, J.; Bonatto, C.; Kurtev, R.; Clarke, J. R. A.; Penaloza, F.; Sale, S. E.; Minniti, D.; Alonso-Garcia, J.; Artigau, E.; Barba, R.; Bica, E.; Baume, G. L.; Catelan, M.; Chene, A. N.; Dias, B.; Folkes, S. L.; Froebrich, D.; Geisler, D.; de Grijs, R.; Hanson, M. M.; Hempel, M.; Ivanov, V. D.; Kumar, M. S. N.; Lucas, P.W.; Mauro, F.; Moni Bidin, C.; Rejkuba, M.; Saito, R. K.; Tamura, M.; Toledo, I. (2011-08)
      Context. VISTA Variables in the Via Lactea (VVV) is one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV is scanning the Milky Way bulge and an adjacent ...

    • New galactic star clusters discovered in the VVV survey : Candidates projected on the inner disk and bulge 

      Borissova, J.; Chené, A. N.; Ramírez Alegría, S.; Sharma, S.; Clarke, J. R. A.; Kurtev, R.; Negueruela, I.; Marco, A.; Amigo, P.; Minniti, D.; Bica, E.; Bonatto, C.; Catelan, M.; Fierro, C.; Geisler, D.; Gromadzki, M.; Hempel, M.; Hanson, M. M.; Ivanov, V. D.; Lucas, P.W.; Majaess, D.; Moni Bidin, C.; Popescu, B.; Saito, R.K. (2014-09)
      Context. VISTA Variables in the Vía Láctea (VVV) is one of six ESO Public Surveys using the 4 meter Visible and Infrared Survey Telescope for Astronomy (VISTA). The VVV survey covers the Milky Way bulge and an adjacent ...

    • Small scale star formation as revealed by VVVX galactic cluster candidates 

      Borissova, J.; Kurtev, R.; Amarinho, N.; Alonso-Garcia, J.; Alegria, S. Ramirez; Bernal, S.; Medina, N.; Chene, A. -N.; Ivanov, V. D.; Lucas, P. W.; Minniti, D. (2020-10-02)
      We report a search and analysis of obscured cluster candidates in the "VISTA Variables in the Via Lactea eXtended (VVVX)" ESO Public Survey area encompassing the region between 229.4 < l <295.2 and -4.3 < b <4.4 of the ...

    • The VMC survey - XX. Identification of new Cepheids in the Small Magellanic Cloud 

      Moretti, M. I.; Clementini, G.; Ripepi, V.; Marconi, M.; Rubele, S.; Cioni, M. R L; Muraveva, T.; Groenewegen, M. A T; Cross, N. J G; Ivanov, V. D.; Piatti, A. E.; de Grijs, R. (2016-06-21)
      We present Ks-band light curves for 299 Cepheids in the Small Magellanic Cloud (SMC) of which 288 are new discoveries that we have identified using multi-epoch near-infrared photometry obtained by the VISTA survey of the ...

    • THE VMC SURVEY. XIX. CLASSICAL CEPHEIDS in the SMALL MAGELLANIC CLOUD 

      Ripepi, V.; Marconi, M.; Moretti, M. I.; Clementini, G.; Cioni, M. R L; De Grijs, R.; Emerson, J. P.; Groenewegen, M. A T; Ivanov, V. D.; Piatti, A. E. (2016-06-01)
      The VISTA near-infrared YJK s survey of the Magellanic Clouds System (VMC) is collecting deep K s-band time-series photometry of pulsating variable stars hosted by the two Magellanic Clouds and their connecting Bridge. In ...

    • VVV High proper motion stars I. The catalogue of bright Ks stars 

      Kurtev, R.; Gromadzki, M.; Beamin, J. C.; Folkes, S. L.; Ramirez, K. Pena; Ivanov, V. D.; Borissova, J.; Villanueva, V.; Minniti, D.; Mendez, R.; Lucas, P. W.; Smith, L. C.; Pinfield, D. J.; Kuhn, M. A.; Jones, H. R. A.; Antonova, A.; Yip, A. K. P. (2017-01-01)
      Knowledge of the stellar content near the Sun is important for a broad range of topics ranging from the search for planets to the study of Milky Way structure. The most powerful method for identifying potentially nearby ...

    • VVV-WIT-01: highly obscured classical nova or protostellar collision? 

      Lucas, P. W.; Minniti, D.; Kamble, A.; Kaplan, D. L.; Cross, N.; Dekany, I.; Ivanov, V. D.; Kurtev, R.; Saito, R. K.; Smith, L. C.; Catelan, M.; Masetti, N.; Toledo, I.; Hempel, M.; Thompson, M. A.; Peña, C. Contreras; Forbrich, J.; Krause, M.; Dale, J.; Borissova, J.; Emerson, J.P. (2020-03)
      A search of the first Data Release of the VISTA Variables in the Via Lactea (VVV) Survey discovered the exceptionally red transient VVV-WIT-01 (H-Ks=5.2). It peaked before March 2010, then faded by ~9.5 mag over the following ...

    • VVVX-Gaia Discovery of a Low Luminosity Globular Cluster in the Milky Way Disk 

      Garro, E. R.; Minniti, D.; Gómez, M.; Alonso-García, J.; Barbá, R. H.; Barbuy, B.; Clariá, J. J.; Chené, A. N.; Dias, B.; Hempel, M.; Ivanov, V. D.; Lucas, P. W.; Majaess, D.; Mauro, F.; Bidin, C. Moni; Palma, T.; Pullen, J. B.; Saito, R. K.; Smith, L.; Surot, F.; Alegría, S. Ramírez; Rejkuba, M.; Ripepi, V. (2020-10-22)
      Milky Way globular clusters (MW GCs) are difficult to identify at low Galactic latitudes because of high differential extinction and heavy star crowding. The new deep near-IR images and photometry from the VISTA Variables ...