Determining fundamental properties of stars through stellar modeling has improved substantially due to recent advances in asteroseismology. Thanks to the unprecedented data quality obtained by space missions, particularly CoRoT and Kepler, invaluable information is extracted from the high-precision stellar oscillation frequencies, which provide

A sample of 10 nearby intermediate-type active galactic nuclei (AGNs) drawn from the Sloan Digital Sky Survey is presented. The aim of this work is to provide estimations of the black hole (BH) mass for the sample galaxies from the dynamics of the broad-line region. For this purpose, a detailed spectroscopic analysis of the objects was done. Using

In just one year of operation, the SDSS-III/APOGEE survey has amassed the largest collection ever of high-resolution, H-band spectra for Be-type emission-line stars. Of the 300 fibers used in each APOGEE observation, 35 are reserved for hot, telluric-absorption standard stars that are selected from the bluest stars (in J-Ks color) in each field and

We present the first public data release (DR1) of the Calar Alto Legacy Integral Field Area (CALIFA) survey. It consists of science-grade optical datacubes for the first 100 of eventually 600 nearby (0.005 z 0.03) galaxies, obtained with the integral-field spectrograph PMAS/PPak mounted on the 3.5 m telescope at the Calar Alto observatory. The

Large spectroscopic surveys require automated methods of analysis. This paper explores the use of k-means clustering as a tool for automated unsupervised classification of massive stellar spectral catalogs. The classification criteria are defined by the data and the algorithm, with no prior physical framework. We work with a representative set of

We present an archaeoastronomical analysis of the orientations of six protohistoric sanctuaries and public buildings located in archaeological sites of the south of the Iberian Peninsula (Coria del Rio, El Carambolo, Saltillo, Mesa de Setefilla, Tejada la Vieja and El Oral). This study, the first of its kind conducted on a sample of Early Iron Age