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Mostrando ítems 31-40 de 104
Study of the helium enrichment in globular clusters
(2015)
En los últimos años, ha habido un aumento en la evidencia existente que descarta lahipótesis de que los cúmulos globulars (GCs) están bien definidos por una única poblaciónestelar (SSP). De hecho, las poblaciones múltiples ...
Analysis of two SMC H II Regions Considering Thermal Inhomogeneities: Implications for the Determinations of Extragalactic Chemical Abundances
(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 ...
Optical Spectroscopy of the Somewhat Peculiar Type IIb Supernova 2001ig
(2009)
Here we present previously unpublished optical spectra of supernova (SN) 2001ig, a Type IIb SN, from about a week after explosion until nearly one year later. The earliest spectrum consists of only a few broad absorption ...
Population Parameters of Intermediate-age Star Clusters in the Large Magellanic Cloud. II. New Insights from Extended Main-sequence Turnoffs in Seven Star Clusters
(2011)
We discuss new photometry from high-resolution images of seven intermediate-age (1-2 Gyr) star clusters in the Large Magellanic Cloud taken with the Advanced Camera for Surveys on board the Hubble Space Telescope. We fit ...
Spectral intensities in cubic systems. II. The MoCl63- system in cubic elpasolite crystals
(Sociedad Mexicana de Fisica, 1998)
The visible and near infrared luminescence spectra of MoCl63- in Cs2NaMCl6 (M=Sc, Y, ln) and MoBr63- in Cs2NaYBr6 have been reported between 15 000 cm-1 and 3000 cm-1 at liquid helium temperatures. It has been observed ...
Horizontal branch stars: the interplay between observations and theory, and insights into the formation of the Galaxy
(2009)
We review and discuss horizontal branch (HB) stars in a broad astrophysical context, including both variable and non-variable stars. A reassessment of the Oosterhoff dichotomy is presented, which provides unprecedented ...