Search Publications
Validation of the new Hipparcos reduction
van Leeuwen, F.
Context: A new reduction of the astrometric data as produced by the Hipparcos mission has been published, claiming accuracies for nearly all stars brighter than magnitude Hp=8 to be better, by up to a factor 4, than in the original catalogue.
Aims: The new Hipparcos astrometric catalogue is checked for the quality of the data and the consisten…
The Geneva-Copenhagen survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk
Holmberg, J.; Nordström, B.; Andersen, J.
Context: Ages, metallicities, space velocities, and Galactic orbits of stars in the Solar neighbourhood are fundamental observational constraints on models of galactic disk evolution. Understanding and minimising systematic errors and sample selection biases in the data is crucial for their interpretation.
Aims: We aim to consolidate the calib…
Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs
Zuckerman, B.; Song, Inseok; McElwain, Michael +1 more
Dusty debris disks around main-sequence stars are signposts for the existence of planetesimals and exoplanets. From cross-correlating Hipparcos stars with the IRAS catalogs, we identify 146 stars within 120 pc of Earth that show excess emission at 60 µm. This search took special precautions to avoid false positives. Our sample is reasonably …
A new calibration of Galactic Cepheid period-luminosity relations from B to K bands, and a comparison to LMC relations
Arriagada, P.; McArthur, B. E.; Benedict, G. F. +8 more
Context: The universality of the Cepheid period-luminosity (PL) relations has been under discussion since metallicity effects were assumed to play a role in the value of the intercept and, more recently, of the slope of these relations.
Aims: The goal of the present study is to calibrate the Galactic PL relations in various photometric bands (…
Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations
Scholz, R. -D.; Piskunov, A. E.; Kharchenko, N. V. +2 more
We present the 2nd version of the Catalogue of Radial Velocities with Astrometric Data (CRVAD-2). This is the result of the cross-identification of stars from the All-Sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5) with the General Catalogue of Radial Velocities and with other recently published radial velocity lists and catalogues. The CRV…
Oxygen abundances in nearby stars. Clues to the formation and evolution of the Galactic disk
Allende Prieto, C.; Lambert, D. L.; Ramírez, I.
The abundances of iron and oxygen are homogeneously determined in a sample of 523 nearby (d<150 pc) FGK disk and halo stars with metallicities in the range -1.5<[Fe/H]<0.5. Iron abundances were obtained from an LTE analysis of a large set of Fe I and Fe II lines with reliable atomic data. Oxygen abundances were inferred from a restricted …
New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems
Lépine, Sébastien; Bongiorno, Bethany
We perform a search for faint, common proper motion companions of Hipparcos stars using the recently published Lépine-Shara Proper Motion-North catalog of stars with proper motion µ>0.15'' yr-1. Our survey uncovers a total of 521 systems with angular separations 3''<Δθ<1500'', with 15 trip…
Statistical properties of a sample of periodically variable B-type supergiants. Evidence for opacity-driven gravity-mode oscillations
Aerts, C.; Puls, J.; Lefever, K.
Aims:We have studied a sample of 28 periodically variable B-type supergiants selected from the HIPPARCOS mission and 12 comparison stars covering the whole B-type spectral range. Our goal is to test if their variability is compatible with opacity-driven non-radial oscillations.
Methods: We have used the NLTE atmosphere code FASTWIND to derive …
Eclipsing binaries observed with the WIRE satellite. II. β Aurigae and non-linear limb darkening in light curves
Southworth, J.; Bruntt, H.; Buzasi, D. L.
Aims:We present the most precise light curve ever obtained of a detached eclipsing binary star and use it investigate the inclusion of non-linear limb darkening laws in light curve models of eclipsing binaries. This light curve, of the bright eclipsing system β Aurigae, was obtained using the star tracker aboard the wire satellite and contains 30 …
Trigonometric Parallaxes of Central Stars of Planetary Nebulae
Harris, Hugh C.; Vrba, Frederick J.; Leggett, S. K. +11 more
Trigonometric parallaxes of 16 nearby planetary nebulae are presented, including reduced errors for seven objects with previous initial results and results for six new objects. The median error in the parallax is 0.42 mas, and 12 nebulae have parallax errors of less than 20%. The parallax for PHL 932 is found here to be smaller than was measured b…