We present the largest data base so far of atmospheric optical turbulence profiles [197 035 individual C2N(h)] for an astronomical site, the Roque de los Muchachos Observatory (La Palma, Spain). This C2N(h) data base was obtained through generalized SCIDAR observations at the 1-m Jacobus Kapteyn Telescope from 2004 February to 2009 August
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Atmospheric optical turbulence at the Roque de los Muchachos Observatory: data base and recalibration of the generalized SCIDAR dataGarcía-Lorenzo, B. et al.92011
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Atmospheric parameters of 169 F-, G-, K- and M-type stars in the Kepler field
The asteroseismic and planetary studies, like all research related to stars, need precise and accurate stellar atmospheric parameters as input. We aim at deriving the effective temperature (Teff), the surface gravity (log g), the metallicity ([Fe/H]), the projected rotational velocity (v sin i) and the MK type for 169 F-, G-, K- and M-type Kepler
Molenda-Żakowicz, J. et al.Fecha de publicación:
92013 -
Atypical Mg-poor Milky Way Field Stars with Globular Cluster Second-generation-like Chemical Patterns
We report the peculiar chemical abundance patterns of 11 atypical Milky Way (MW) field red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). These atypical giants exhibit strong Al and N enhancements accompanied by C and Mg depletions, strikingly similar to those observed in the so-called second-generation
Fernández-Trincado, J. G. et al.Fecha de publicación:
92017 -
Automated pipelines for spectroscopic analysis
The Gaia mission will have a profound impact on our understanding of the structure and dynamics of the Milky Way. Gaia is providing an exhaustive census of stellar parallaxes, proper motions, positions, colors and radial velocities, but also leaves some glaring holes in an otherwise complete data set. The radial velocities measured with the on
Allende Prieto, C.Fecha de publicación:
92016 -
Automatic unsupervised spectral classification of all SDSS/DR7 galaxies
Not Available
Sánchez-Almeida, J. et al.Fecha de publicación:
92010 -
Axiomatic approach to the cosmological constant
A theory of the cosmological constant Λ is currently out of reach. Still, one can start from a set of axioms that describe the most desirable properties a cosmological constant should have. This can be seen in certain analogy to the Khinchin axioms in information theory, which fix the most desirable properties an information measure should have and
Beck, ChristianFecha de publicación:
92009