Search Publications
The Radial Velocity Experiment (RAVE): First Data Release
Gilmore, G.; Freeman, K. C.; Evans, N. W. +51 more
We present the first data release of the Radial Velocity Experiment (RAVE), an ambitious spectroscopic survey to measure radial velocities and stellar atmosphere parameters (temperature, metallicity, and surface gravity) of up to one million stars using the Six Degree Field multiobject spectrograph on the 1.2 m UK Schmidt Telescope of the Anglo-Au…
Elemental abundance survey of the Galactic thick disc
Lambert, David L.; Allende Prieto, Carlos; Reddy, Bacham E.
We have performed an abundance analysis for F- and G- dwarfs of the Galactic thick-disc component. A sample of 176 nearby (d<= 150pc) thick-disc candidate stars was chosen from the Hipparcos catalogue and subjected to a high-resolution spectroscopic analysis. Using accurate radial velocities combined with the Hipparcos astrometry, kinematics (U…
Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample
Gray, R. O.; Corbally, C. J.; Garrison, R. F. +5 more
We are obtaining spectra, spectral types, and basic physical parameters for the nearly 3600 dwarf and giant stars earlier than M0 in the Hipparcos catalog within 40 pc of the Sun. Here we report on results for 1676 stars in the southern hemisphere observed at Cerro Tololo Inter-American Observatory and Steward Observatory. These results include ne…
Basic physical parameters of a selected sample of evolved stars
Pasquini, L.; Weiss, A.; de Medeiros, J. R. +6 more
We present the detailed spectroscopic analysis of 72 evolved stars, which were previously studied for accurate radial velocity variations. Using one Hyades giant and another well studied star as the reference abundance, we determine the [Fe/H] for the whole sample. These metallicities, together with the T_eff values and the absolute V-band magnitu…
Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
Gontcharov, G. A.
The Pulkovo Compilation of Radial Velocities (PCRV) has been made to study the stellar kinematics in the local spiral arm. The PCRV contains weighted mean absolute radial velocities for 35 495 Hipparcos stars of various spectral types and luminosity classes over the entire celestial sphere mainly within 500 pc of the Sun. The median accuracy of th…
Revisiting the population of Galactic open clusters
Scholz, R. -D.; Piskunov, A. E.; Kharchenko, N. V. +2 more
We present results of a study of the galactic open cluster population based on the all-sky catalogue ASCC-2.5 (I/280A) compiled from Tycho-2, Hipparcos and other catalogues. The sample of optical clusters from ASCC-2.5 is complete up to about 850 pc from the Sun. The symmetry plane of the clusters' distribution is determined to be at Z_0=-22±4 pc,…
2MASS wide field extinction maps. I. The Pipe nebula
Alves, J.; Lombardi, M.; Lada, C. J.
Context: .
Aims: . We present a 8°×6°, high resolution extinction map of the Pipe nebula using 4.5 million stars from the Two Micron All Sky Survey (2MASS) point source catalog.
Methods: . The use of Nicer (Lombardi & Alves 2001, A&A, 377, 1023), a robust and optimal technique to map the dust column density, allows us to detect a…
Evolutionary state of magnetic chemically peculiar stars
Kochukhov, O.; Bagnulo, S.
Context: .The photospheres of about 5-10% of the upper main sequence stars exhibit remarkable chemical anomalies. Many of these chemically peculiar (CP) stars have a global magnetic field, the origin of which is still a matter of debate.
Aims: .We present a comprehensive statistical investigation of the evolution of magnetic CP stars, aimed at…
Effective temperature scale and bolometric corrections from 2MASS photometry
Ribas, I.; Jordi, C.; Masana, E.
We present a method to determine effective temperatures, angular semi-diameters and bolometric corrections for population I and II FGK type stars based on V and 2MASS IR photometry. Accurate calibration is accomplished by using a sample of solar analogues, whose average temperature is assumed to be equal to the solar effective temperature of 5777 …
The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs
Strader, Jay; Laughlin, Gregory; Ammons, S. Mark +3 more
We have created specialized target lists for radial velocity surveys that are biased toward stars that (1) possess planets and (2) are easiest to observe with current detection techniques. We use a procedure that uniformly estimates fundamental stellar properties of Tycho 2 stars, with errors, using spline functions of broadband photometry and pro…