Browsing by Author "Méndez Bussard, René Alejandro"

Now showing items 1-20 of 37

    • Analysis of the Cramér-Rao Bound in the Joint Estimation of Astrometry and Photometry 
      Méndez Bussard, René Alejandro; Silva Sánchez, Jorge; Oróstica, Rodrigo; Lobos, Rodrigo (The Astronomical Society of the Pacific, 2014)
      In this paper, we use the Cramér-Rao lower uncertainty bound to estimate the maximum precision that could be achieved on the joint simultaneous (or two-dimensional) estimation of photometry and astrometry of a point source ...
    • Basic parameters of three star clusters in the Small Magellanic Cloud: Kron 11, Kron 63 and NGC 121 
      Baume, Gustavo; Noel, Noelia E. D.; Costa Hechenleitner, Edgardo; Carraro, Giovanni; Méndez Bussard, René Alejandro; Pedreros, M. H. (BLACKWELL, 2008-11-11)
      We present observations for three star clusters, Kron 11, Kron 63 and NGC 121, in the Small Magellanic Cloud. We have studied their structure and derived their fundamental parameters by means of their luminosity functions, ...
    • Bayesian inference in hierarchical Stellar systems 
      Videla Araya, Miguel Ignacio (Universidad de Chile, 2021)
      A methodology for Bayesian inference in binary stellar systems based on the No-U-Turn sampler Markov chain Monte Carlo algorithm is presented, providing a precise and efficient estimation of the joint posterior distribution ...
    • 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 Bussard, René Alejandro; 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 ...
    • The chemical enrichment history of the small magellanic cloud and its gradients 
      Carrera, Ricardo; Gallart, Carme; Aparicio, Antonio; Costa Hechenleitner, Edgardo; Méndez Bussard, René Alejandro; Noel, Noelia E. D. (IOP PUBLISHING, 2008-09)
      We present stellar metallicities derived from Ca II triplet spectroscopy in over 350 red giant branch stars in 13 fields distributed in different positions in the Small Magellanic Cloud, ranging from similar to 1 degrees ...
    • 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 ...
    • Experimental study of the astrometric Cramér-Rao limit on bidimensional digital detections 
      San Martín Luque, Claudia Isabel Jesús (Universidad de Chile, 2021)
      La medición de la posición de los astros es un tema fundamental en múltiples áreas de la astronomía, especialmente en la astrometría, cuyo desarrollo depende de la obtención de mejores imágenes con mayor calidad utilizando ...
    • Extended star formation history of the star cluster NGC 2154 in the Large Magellanic Cloud 
      Baume, Gustavo; Carraro, Giovanni; Costa Hechenleitner, Edgardo; Méndez Bussard, René Alejandro; Girardi, L. (2007)
      The colour–magnitude diagram (CMD) of the intermediate-age Large Magellanic Cloud star cluster NGC 2154 and its adjacent field has been analysed using Padova stellar models to determine the cluster’s fundamental parameters ...
    • KINEMATICAL AND CHEMICAL VERTICAL STRUCTURE OF THE GALACTIC THICK DISK. II. A LACK OF DARK MATTER IN THE ... 
      Moni Bidin, Christian; Carraro, Giovanni; Méndez Bussard, René Alejandro; Smith, R. (IOP PUBLISHING LTD, 2012-05-20)
      We estimated the dynamical surface mass density Sigma at the solar position between Z = 1.5 and 4 kpc from the Galactic plane, as inferred from the kinematics of thick disk stars. The formulation is exact within the limit ...
    • The multiwavelength survey by Yale-Chile (MUSYC): Survey design and deep public UBVRIZ ' images and catalogs ... 
      Gawiser, Eric; van Dokkum, Pieter; Herrera, David; Maza Sancho, José; Castander, Francisco; Infante, Leopoldo; Lira Teillery, Paulina; Quadri, Ryan; Toner, Ruth; Treister, Ezequiel; Urry, C. Megan; Altmann, Martin; Assef, Roberto; Christlein, Daniel; Coppi, Paolo S.; Durán, María Fernanda; Franx, Marijn; Galaz, Gaspar, 1967-; Huerta, Leonor; Liu, Charles; López Morales, Sebastián; Méndez Bussard, René Alejandro; Moore, David C.; Rubio López, Mónica; Ruiz González, María Teresa; Toft, Sune; Yi, Sukyoung K. (UNIV CHICAGO PRESS, 2006-01)
      We present UBVRIz' optical images taken with MOSAIC on the CTIO 4 m telescope of the 0.32 deg(2) Extended Hubble Deep Field-South. This is one of four fields comprising the MUSYC survey, which is optimized for the study ...
    • NGC 6404 and 6583: two neglected intermediate-age open clusters located in the Galactic Centre direction 
      Carraro, Giovanni; Méndez Bussard, René Alejandro; Costa Hechenleitner, Edgardo (2005)
      We report on VI charge-coupled device photometry of two fields centred in the region of the open clusters NGC 6404 and 6583 down to V = 22.0. So far these clusters have never been studied, and we provide for the first time ...
    • NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results 
      Smart, R. L.; Tinney, C. G.; Bucciarelli, B.; Marocco, F.; Abbas, U.; Andrei, A.; Bernardi, G.; Burningham, B.; Cardoso, C.; Costa Hechenleitner, Edgardo; Crosta, M. T.; Daprá, A.; Day Jones, A.; Goldman, B.; Jones, H. R.; Lattanzi, M. G.; Leggett, S. K.; Lucas, P.; Méndez Bussard, René Alejandro; Penna, J. L.; Pinfield, D.; Smith, L.; Sozzetti, A.; Vecchiato, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2013)
      The discovery and subsequent detailed study of T dwarfs have provided many surprises and pushed the physics and modelling of cool atmospheres in unpredicted directions. Distance is a critical parameter for studies of ...
    • Old main-sequence turnoff photometry in the small magellanic cloud. I. Constraints on the star formation ... 
      Noel, Noelia E. D.; Gallart, Carme; Costa Hechenleitner, Edgardo; Méndez Bussard, René Alejandro (2007)
      We present ground-based B-and R-band color-magnitude diagrams (CMDs) reaching the oldest main-sequence (MS) turnoffs with good photometric accuracy for 12 fields in the Small Magellanic Cloud (SMC). Our fields, located ...
    • On the local dark matter density 
      Moni Bidin, C.; Smith, R.; Carraro, Giovanni; Méndez Bussard, René Alejandro; Moyano, M. (EDP Sciences, 2015)
      Context. In 2012, we applied a three-dimensional formulation to kinematic measurements of the Galactic thick disk and derived a surprisingly low dark matter density at the solar position. This result was challenged by Bovy ...
    • Optimal sampling method for uncertainty reduction of orbital parameters on binary systems 
      Córdova Huenupil, Felipe Ignacio Alejandro (Universidad de Chile, 2021)
      La inferencia de parámetros orbitales para sistemas binarios es extremadamente importante para el estudio evolutivo del universo, puesto que dichos parámetros orbitales permiten inferir las masas individuales de los ...
    • PCR3BP problem: transfer orbit evaluation from LEO orbit to lunar orbit of a six units cubesat satellite 
      Silva Fernández, Rodrigo Fernando (Universidad de Chile, 2021)
      La Luna ha sido objeto de admiración y asombro para los seres humanos desde tiempos antiguos. Casi está en la naturaleza humana observar e incluso tener el deseo de alcanzar la Luna. En tiempos modernos, aterrizar en la ...
    • Performance Analysis of the Least-Squares Estimator in Astrometry 
      Lobos, Rodrigo A.; Silva, Jorge F.; Méndez Bussard, René Alejandro; Orchard Concha, Marcos (IOP Publishing, 2015)
      We characterize the performance of the widely used least-squares estimator in astrometry in terms of a comparison with the Cramer-Rao lower variance bound. In this inference context the performance of the least-squares ...
    • Photometric parallaxes of Southern high proper motion stars. I. 
      Costa Hechenleitner, Edgardo; Méndez Bussard, René Alejandro (2003)
      Photometric distances derived from VRI photometry are given for 44 high proper motion stars from the Cerro El Roble proper motion surveys of Wroblewski & Torres and Wroblewski & Costa. The observations were carried out ...
    • Photometry of seven overlooked open clusters in the first and fourth Galactic quadrants 
      Carraro, Giovanni; Janes, Kenneth A.; Costa Hechenleitner, Edgardo; Méndez Bussard, René Alejandro (BLACKWELL, 2006-05-21)
      CCD BVI photometry is presented for seven previously unstudied star clusters projected towards the inner side of the Galaxy: Trumpler 23, Lynga 3, Collinder 307, Ruprecht 134, ESO552SC16, AL 5 and Kronberger 3. Colour-magnitude ...
    • Potential asteroid discoveries by the ESA gaia misión results from follow-up observations 
      Carry, B.; Thuillot, W.; Spoto, F.; David, P.; Berthier, J.; Tanga, P.; Mignard, F.; Bouquillon, S.; Méndez Bussard, René Alejandro; Rivet, J. P.; Le Van Suu, A.; Dell’Oro, A.; Fedorets, G.; Frezouls, B.; Granvik, M.; Guiraud, J.; Muinonen, K.; Panem, C.; Pauwels, T.; Roux, W.; Walmsley, G.; Petit, J. M.; Abe, L.; Ayvazian, V.; Baillié, K.; Baransky, A.; Bendjoya, P.; Dennefeld, M.; Desmars, J.; Eggl, S.; Godunova, V.; Hestroffer, D.; Inasaridze, R.; Kashuba, V.; Krugly, Y. N.; Molotov, I. E.; Robert, V.; Simon, A.; Sokolov, I.; Souami, D.; Tarady, V.; Taris, F.; Troianskyi, V.; Vasylenko, V.; Vernet, D. (EDP Sciences, 2021)
      Context. Since July 2014, the Gaia mission of the European Space Agency has been surveying the entire sky down to magnitude 20.7 in the visible. In addition to the millions of daily observations of stars, thousands of ...