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OPTICAL POLARIZATION OF SOLAR TYPE STARS WITH DEBRIS DISKS
L. García M. Gómez

Abstract: We report optical aperture polarimetry for 34 southern hemisphere main-sequence stars with debris disks, in addition to 54 stars without evidence of disk. These sets of stars are combined with another set of 109 stars from the northern hemisphere, obtained fr

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INTRAGROUP DARK MATTER DISTRIBUTION IN SMALL GROUPS OF HALOS IN A ΛCDM COSMOLOGY

Abstract: We study the distribution of intragroup dark matter in small groups of dark matter galaxy size halos in a ACDM cosmology. These groups are identified using a physical criterion and may be an appropriate representation of small galaxy groups. We quantify the a

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HII REGIONS IN HYDROSTATIC BALANCE BETWEEN GAS PRESSURE, RADIATION PRESSURE AND GRAVITY

Abstract: We study the solutions of a modified version of the isothermal Lane-Emden equation, which incorporates the effect of the (owtwards directed) radiation pressure resulting from photoionizations. These solutions are relevant for HII regions around a cluster with

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RADIO EMISSION VARIABILITY AND PROPER MOTIONS OF WR 112

Abstract: We analyzed 64 radio observations at the frequency of 8.4 GHz of the Wolf-Rayet star WR 112, taken from the Very Large Array archive. These observations cover a time baseline of 13 years, from June 2000 to July 2013. The radio structure of WR 112 is consisten

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INTERACTION BETWEEN THE IGM AND A DWARF GALAXY
V. Lora A. C. Raga E. K. Grebel

Abstract: Dwarf Galaxies are the most common objects in the Universe and are believed to contain large amounts of dark matter. There are mainly three morphologic types of dwarf galaxies: dwarf ellipticals, dwarf spheroidals and dwarf irregulars. Dwarf irregular galaxie

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BINARY NATURE OF THE HADS STARS AN LYN & BE LYN

Abstract: From newly determined times of maxima from CCD photometry of the HADS stars AN Lyn & BE Lyn and a compilation of previous times of maxima, we are able to determine the binary nature of these stars. We determine their physical parameters by means of uvby — β p

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A NEW APPROXIMATE ANALYTIC SOLUTION FOR THE IONIZATION STRUCTURE OF A STRÖMGREN SPHERE
A. C. Raga

Abstract: (Strömgren 1939) presented a model for the photoionization of a homogeneous nebula, and derived approximate analytic solutions to his model. The present paper explores Strömgren's model, and shows that it is possible to construct more accurate (though of cour

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SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. VI.
V. G. Orlov V. V. Voitsekhovich

Abstract: We present speckle interferometric measurements of double stars performed during August of 2010 with the 1.5 m telescope and during May of 2010 with the 2.1 m telescope of the Observatorio Astronómico Nacional at SPM (México). We report here the results of 33

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MULTICOLOR U BV RI POLARIMETRY OF NGC 4755 AND THE B CEPHEI POPULATION

Abstract: We present U BV RI polarimetric observations of 66 stars in the direction of NGG 4755, including eleven β cephei stars. About half of these variables show indications of intrinsic polarization, but according to the theory neither radial nor non-radial pulsati

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COLOR-DENSITY RELATION IN THE LOW Z SAMPLE OF THE SDSS DR10
Xin-Fa Deng

Abstract: The aim of this study is to examine the environmental dependence of the u - r, u - g, g - r, r - i and i - z colors in the loz z sample of the Sloan Digital Sky Survey Data Release 10 (SDSS DR10). To decrease the radial selection effect, I divide the low z sa

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A VIRTUAL OBSERVATORY FOR PHOTOIONIZED NEBULAE: THE MEXICAN MILLION MODELS DATABASE (3MDB).

Abstract: Photoionization models obtained with numerical codes are widely used to study the physics of the interstellar medium (planetary nebulae, HII regions, etc). Grids of models are performed to understand the effects of the different parameters used to describe th

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ON THE EQUILIBRIUM OF A DISTORTED HETEROGENEOUS ELLIPSOIDAL MASS. I. THE HOMOGENEOUS MASS

Abstract: Departing from a mono-parametric fourth-order surface equation for an ellipsoid (rather than of the second order, as in the classical homogeneous figures), we investigate the hydrostatic equilibrium of a heterogeneous mass, whose homogeneous version —which wi

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CHEMICAL ABUNDANCES AND PHYSICAL PARAMETERS OF HII REGIONS IN THE MAGELLANIC CLOUDS

Abstract: We used ultraviolet, optical and infrared data of eleven HII regions in the Magellanic Clouds in order to determine their physical parameters and chemical abundances. The photoionization modeling of six HII regions in the LMC and five HII regions in the SMC,

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