Oxygen abundances for a large sample of dwarf and giant stars kinematically selected to be part of the Galactic thin and thick disks have been determined from a non-LTE analysis of the O I triplet lines at 777 nm. The abundance analysis was performed using the infrared flux method temperature scale, trigonometric surface gravities, and accurate

A survey of outreach related beliefs, attitudes, and activities of the Spanish professional astronomers is presented. More than one hundred scientists answered an ad-hoc drawn up questionnaire, whose results have been analysed statistically. This feedback form is an improved version of that used in a previous research carried out by the authors

We have analyzed the structure of bulges of early-to intermediate-type spirals, on nuclear and global scales, using HST NIR imaging together with ground-based NIR imaging. The goals are (a) to see whether results on bulge structure derived from ground-based, 1" FWHM seeing data remain valid when high-resolution HST data are used; (2) to compare

On the basis of NLTE profile calculations obtained by employing the radiative transfer code MULTI, the influence of the uncertainties of various parameters important in the formation of the photospheric Mn I 539.4 nm spectral line are discussed. Two cases are separately considered: with and without energy transfer between Mg II and Mn I. All

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We study a neutrino gas in equilibrium both at T = 0 and at finite temperature. The neutrinos are assumed to be massive Dirac particles with two generations interacting with each other via neutral currents and with a background of matter. We analyze the main properties of the neutrino eigenmodes in the medium, such as effective masses and mixing