Now showing items 1-20 of 47

    • A new Neptune-mass planet orbiting HD219828 

      Melo, C.; Santos, N. C.; Gieren, W.; Pietrzynski, Grzegorz; Ruiz González, María Teresa; Sousa, S. G.; Bouchy, F.; Lovis, C.; Mayor, M.; Pepe, F.; Queloz, D.; Da Silva, R.; Udry, S. (2007)
      Two years ago a new benchmark for the planetary survey was set with the discoveries of three extrasolar planets with masses below 20 M-circle plus. In particular, the serendipitous discovery of the 14 M-circle plus planet ...
    • Accretion rates on pre-main-sequence stars in the young open cluster NGC 6530 

      Gallardo, José; Valle, Luciano del; Ruiz González, María Teresa (2012-01)
      It is well accepted that during the star formation process, material from a protoplanetary disk is accreted onto the central object during the first ∼1–5 Myr. Different authors have published measurements of accretion ...
    • Analysis of chemical abundances in planetary nebulae with [WC] central stars I. Line intensities and physical conditions 

      García Rojas, Jorge; Peña, Miriam; Morisset, Christophe; Mesa Delgado, Adal; Ruiz González, María Teresa (EDP SCIENCES S A, 2012-02)
      Context. Planetary nebulae (PNe) around Wolf-Rayet [WR] central stars ([WR] PNe) constitute a particular photoionized nebula class that represents about 10% of the PNe with classified central stars. Aims. We analyse ...
    • Analysis of chemical abundances in planetary nebulae with [WC] central stars II. Chemical abundances and the abundance discrepancy factor 

      García Rojas, Jorge; Peña, Miriam; Morisset, Christophe; Delgado Inglada, Gloria; Mesa Delgado, Adal; Ruiz González, María Teresa (EDP Sciences, 2013)
      Aims. We present the abundance analysis of 12 planetary nebulae ionized by [WC]-type stars and weak-emission-line stars (wels) obtained from high-resolution spectrophotometric data. Our main aims are to determine the ...
    • Analysis of two SMC H II Regions Considering Thermal Inhomogeneities: Implications for the Determinations of Extragalactic Chemical Abundances 

      Peña Guerrero, María A.; Peimbert, Antonio; Peimbert, Manuel; Ruiz González, María Teresa (IOP PUBLISHING LTD, 2012-02-20)
      We present long-slit spectrophotometry considering the presence of thermal inhomogeneities (t(2)) of two H II regions in the Small Magellanic Cloud (SMC): NGC 456 and NGC 460. Physical conditions and chemical abundances ...
    • Benchmark cool companions: ages and abundances for the PZ Telescopii system 

      Jenkins, James Stewart; Pavlenko, Y. V.; Ivanyuk, O.; Gallardo, J.; Jones, M. I.; Day-Jones, A. C.; Jones, H. R. A.; Ruiz González, María Teresa; Pinfield, D. J.; Yakovina, L. (WILEY-BLACKWELL, 2012-03)
      We present new ages and abundance measurements for the pre-main-sequence star PZ Telescopii (more commonly known as PZ Tel). PZ Tel was recently found to host a young and low-mass companion. Such companions, whether they ...
    • BVRI light curves for 29 type Ia supernovae 

      Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Schommer, R. A.; Maza Sancho, José; Antenaza, Roberto; Wischnjewsky, Marina; Valladares, Geraldo; Muena, César; González, L. E.; Avilés, R.; Wells, Lisa; Smith, R. C.; Navarrete, Mauricio; Covarrubias, Ricardo; Williger, G.; Walker, Alistair R.; Layden, A. C.; Elias, J. H.; Baldwin, J. A.; Hernández, Manuel; Tirado, Hernán; Ugarte, Patricio; Elston, R.; Saavedra, Nelson; Barrientos, Felipe; Costa Hechenleitner, Edgardo; Lira Teillery, Paulina; Ruiz González, María Teresa; Anguita, Claudio; Gómez, Ximena; Ortiz, P.; Della Valle, M.; Danziger, J.; Storm, J.; Kim, Y. C.; Bailyn, C.; Rubenstein, Eric P.; Tucker, D.; Cersosimo, S.; Méndez, R. A.; Siciliano, L.; Sherry, W.; Chaboyer, Brian; Koopmann, R. A.; Geisler, D.; Sarajedini, A.; Dey, Arjun; Tyson, N.; Rich, R. Michael; Gal, R.; Lamontagne, Robert; Caldwell, N.; Guhathakurta, Puragra; Phillips, A. C.; Szkody, P.; Prosser, C.; Ho, Luis C.; McMahan, R.; Baggley, G.; Cheng, K. P.; Havlen, R.; Wakamatsu, K.; Janes, Kenneth A.; Malkan, Mathew; Baganoff, F.; Seitzer, P.; Shara, M.; Sturch, C.; Hesser, J.; Hartigan, P.; Hughes, J.; Welch, D. L.; Williams, T. B.; Ferguson, H.; Francis, P. J.; French, L.; Bolte, M.; Roth, J.; Odewahn, S.; Howell, S.; Krzeminski, W. (American Astronomical Society, 1996-12)
      BV(RI)_KC_ light curves are presented for 27 type Ia supernovae discovered during the course of the Calan/Tololo Survey and for two other SNe Ia observed during the same period. Estimates of the maximum light magnitudes ...
    • BVRI light curves for 29 type Ia supernovae 

      Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Schommer, R. A.; Maza Sancho, José; Antenaza, Roberto; Wischnjewsky, Marina; Valladares, Geraldo; Muena, César; González, L. E.; Avilés, R.; Wells, Lisa; Smith, R. C.; Navarrete, Mauricio; Covarrubias, Ricardo; Williger, G.; Walker, Alistair R.; Layden, A. C.; Elias, J. H.; Baldwin, J. A.; Hernández, Manuel; Tirado, Hernán; Ugarte, Patricio; Elston, R.; Saavedra, Nelson; Barrientos, Felipe; Costa Hechenleitner, Edgardo; Lira Teillery, Paulina; Ruiz González, María Teresa; Anguita, Claudio; Gómez, Ximena; Ortiz Arce, Patricio; Della Valle, Massimo; Danziger, J.; Storm, J.; Kim, Y. C.; Bailyn, C.; Rubenstein, Eric P.; Tucker, D.; Cersosimo, S.; Méndez, R. A.; Siciliano, L.; Sherry, W.; Chaboyer, Brian; Koopmann, R. A.; Geisler, D.; Sarajedini, A.; Dey, Arjun; Tyson, N.; Rich, R. Michael; Gal, R.; Lamontagne, Robert; Caldwell, N.; Guhathakurta, Puragra; Phillips, A. C.; Szkody, P.; Prosser, C.; Ho, Luis C.; McMahan, R.; Baggley, G.; Cheng, K. P.; Havlen, R.; Wakamatsu, K.; Janes, Kenneth A.; Malkan, Mathew; Baganoff, F.; Seitzer, P.; Shara, M.; Sturch, C.; Hesser, J.; Hartigan, P.; Hughes, J.; Welch, D. L.; Williams, T. B.; Ferguson, H.; Francis, P. J.; French, L.; Bolte, M.; Roth, J.; Odewahn, S.; Howell, S.; Krzeminski, W. (American Astronomical Society, 1996-12)
      BV(RI)_KC_ light curves are presented for 27 type Ia supernovae discovered during the course of the Calan/Tololo Survey and for two other SNe Ia observed during the same period. Estimates of the maximum light magnitudes ...
    • CE 315: a new interacting double-degenerate binary star 

      Ruiz González, María Teresa; Rojo Rubke, Patricio; Garay Brignardello, Guido; Maza Sancho, José (UNIV CHICAGO PRESS, 2001-05-10)
      We present spectroscopic observations of object CE 315 revealing a blue continuum with strong emission lines. Most of the detected lines are identified with He I or He II in emission, with a handful of faint lines of ...
    • A comprehensive view of the Virgo stellar stream 

      Duffau, Sonia; Vivas, A. Katherina.; Zinn, Robert; Méndez Bussard, René Alejandro; Ruiz González, María Teresa (2014)
      To explore the complex halo substructure that has been reported in the direction of the Virgo constellation, radial velocities and metallicities have been measured for 82 RR Lyrae stars (RRLS) that were identified by the ...
    • CTQ 839: Candidate for the smallest projected separation binary quasar 

      Morgan, Nicholas D.; Burley, Greg; Costa Hechenleitner, Edgardo; Maza Sancho, José; Persson, S. E.; Ruiz González, María Teresa; Schechter, Paul L.; Thompson, Ian; Winn, Joshua N. (2000-03)
      We report the discovery of the new double quasar CTQ 839. This B\18.3, radio-quiet quasar pair is separated by 2A.1 in BRI and H Ðlters, with magnitude di erences of *mB\2.5, *mR\*mI\1.9, and *mH\2.3. Spectral observations ...
    • The CYDER survey: first results 

      Castander, F. J.; Treister, Ezequiel; Maza Sancho, José; Coppi, P. S.; Maccarone, Thomas J.; Zerpf, S. E.; Guzmán, R.; Ruiz González, María Teresa (2003)
      We present the Cal´an-Yale Deep Extragalactic Research (CYDER) Survey. The broad goals of the survey are the study of stellar populations, the star formation history of the universe and the formation and evolution of ...
    • A deep WISE search for very late type objects and the discovery of two halo/thick-disc T dwarfs: WISE 0013+0634 and WISE 0833+0052 

      Pinfield, D. J.; Gomes, J.; Day Jones, A. C.; Leggett, S. K.; Gromadzki, M.; Burningham, B.; Ruiz González, María Teresa; Kurtev, R.; Cattermole, T.; Cardoso, C.; Lodieu, N.; Faherty, J.; Littlefair, S.; Smart, R.; Irwin, M.; Clarke, J. R. A.; Smith, L.; Lucas, P. W.; Gálvez Ortiz, M. C.; Jenkins, James Stewart; Jones, H. R. A.; Rebolo, L.; Béjar, V. J. S.; Gauza, B. (Oxford University Press, 2014)
      A method is defined for identifying late-T and Y dwarfs in WISE down to low values of signalto- noise. This requires a WISE detection only in theW2-band and uses the statistical properties of the WISE multiframe measurements ...
    • Desde Chile un cielo estrellado. Lecturas para fascinarse con la Astronomía 

      Ruiz González, María Teresa (Confín Ediciones - Catalonia, 2013)
      Apelando a la condición mundial privilegiada de los cielos del norte del país, esta publicación de la académica del Departamento de Astronomía (DAS) de la Universidad de Chile y Premio Nacional de Ciencias Exactas, María ...
    • Detection of period variations in extrasolar transiting planet OGLE-TR-111b 

      Díaz, Rodrigo; Rojo, Patricio; Melita, Mario; Hoyer, Sergio; Minniti, Dante; Mauas, Pablo J. D.; Ruiz González, María Teresa (UNIV CHICAGO PRESS, 2008-07-20)
      Two consecutive transits of planetary companion OGLE-TR-111b were observed in the I band. Combining these observations with data from the literature, we find that the timing of the transits cannot be explained by a constant ...
    • Discovery and spectroscopy of the young jovian planet 51 Eri b with the Gemini Planet Imager 

      Macintosh, B.; Graham, J. R.; Barman, T.; Rosa, R. De; Konopacky, Q.; Marley, M.; Marois, C.; Nielsen, E.; Pueyo, L.; Rajan, A.; Rameau, J.; Saumon, D.; Wang, J.; Patience, J.; Ammons, M.; Arriaga, P.; Artigau, E.; Beckwith, S.; Brewster, J.; Bruzzone, S.; Bulger, J.; Burningham, B.; Burrows, A.; Chen, C.; Chiang, E.; Chilcote, J. K.; Dawson, R.; Dong, R.; Doyon, R.; Draper, Z.; Duchêne, G.; Esposito, T.; Fabrycky, Daniel; Fitzgerald, M.; Follette, K.; Fortney, J.; Gerard, B.; Goodsell, S.; Greenbaum, A.; Hibon, P.; Hinkley, S.; Cotten, T.; Hung, L.; Ingraham, P.; Johnson-Groh, M.; Kalas, P.; Lafreniere, D.; Larkin, J.; Lee, J.; Line, M.; Long, D.; Maire, J.; Marchis, F.; Matthews, B.; Max, C.; Metchev, S.; Millar-Blanchaer, M.; Mittal, T.; Morley, C.; Morzinski, K.; Murray, R.; Oppenheimer, R.; Palmer, D.; Patel, R.; Perrin, M.; Poyneer, L.; Rafikov, R.; Rantakyrö, F.; Rice, E.; Rojo Rubke, Patricio; Rudy, A.; Ruffio, J.; Ruiz González, María Teresa; Sadakuni, N.; Saddlemyer, L.; Salama, M.; Savransky, D.; Schneider, A.; Sivaramakrishnan, A.; Song, I.; Soummer, R.; Thomas, S.; Vasisht, G.; Wallace, J.; Ward, K.; Wiktorowicz, S.; Wolff, S.; Zuckerman, B. (American Association for the Advancement of Science, 2015-10-02)
      Directly detecting thermal emission from young extrasolar planets allows measurement of their atmospheric compositions and luminosities, which are influenced by their formation mechanisms. Using the Gemini Planet Imager, ...
    • Discovery of a T dwarf plus white dwarf binary system 

      Day-Jones, A. C.; Pinfield, D. J.; Ruiz González, María Teresa; Beaumont, H.; Burningham, B.; Gallardo, J.; Gianninas, A.; Bergeron, P.; Napiwotzki, R.; Jenkins, James Stewart; Zhang, Z. H.; Murray, D. N.; Catalán, S.; Gomes, J. (WILEY-BLACKWELL, 2011-01)
      We present the discovery of the first T dwarf + white dwarf binary system LSPM 1459+0857 AB, confirmed through common proper motion and spectroscopy. The white dwarf is a high proper motion object from the LSPM catalogue ...
    • ENERGY-DISTRIBUTION OF LOW-LUMINOSITY STARS 

      Ruiz González, María Teresa; Anguita, Claudio; Maza Sancho, José; Roth, Miguel (AMER INST PHYSICS, 1990-10)
    • ESO 439-162/163 - A COMMON PROPER MOTION BINARY FORMED BY A MAGNETIC DQ AND A DC-TYPE WHITE-DWARF 

      Ruiz González, María Teresa; Maza Sancho, José (UNIV CHICAGO PRESS, 1998-12-01)
    • Eta Carinae's 2014.6 spectroscopic event: Clues to the long-term recovery from its Great Eruption 

      Mehner, A.; Davidson, K.; Humphreys, R. M.; Walter, F. M.; Baade, D.; Wit, W. J. de; Martin, J.; Ishibashi, K.; Rivinius, T.; Martayan, C.; Ruiz González, María Teresa; Weis, K. (ESO, 2015)
      Aims. Every 5.5 years, eta Car's light curve and spectrum change remarkably across all observed wavelength bands. These so-called spectroscopic events are most likely caused by the close approach of a companion. We compare ...