/ftp/cats/V/117A



*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
V/117A   ==OBSOLETE version of Catalogue==
23-Jul-2009: (by Francois Ochsenbein) See V/130
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=V/117A
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

drwxr-xr-x 136 cats archive 4096 Jul 11 12:05 [Up] drwxr-xr-x 2 cats archive 4096 Feb 6 2015 [TAR file] -rw-r--r-- 1 cats archive 388 Oct 13 2012 .message -rw-r--r-- 1 cats archive 48 Jul 23 2009 =obsolete= -r--r--r-- 1 cats archive 15633 Oct 3 2008 ReadMe -rw-r--r-- 1 cats archive 1448 Oct 4 2008 +footg5.gif -rw-r--r-- 1 cats archive 29027 Oct 4 2008 +footg8.gif -r--r--r-- 1 cats archive 481749 Sep 30 2008 newcat.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 1422025 May 6 2004 table1.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 2 cats archive 12240 May 13 2004 table2.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : V/117A Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007) ================================================================================ The Geneva-Copenhagen survey of the Solar neighbourhood. I. Ages, metallicities, and kinematic properties of  14000 F and G dwarfs. Nordstrom B., Mayor M., Andersen J., Holmberg J., Pont F., Jorgensen B.R., Olsen E.H., Udry S., Mowlavi N. <Astron. Astrophys. 419, 989 (2004)> =2004A&A...418..989N II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk. Holmberg J., Nordstroem B., Andersen J. <Astron. Astrophys. 475, 519 (2007)> =2007A&A...475..519H ================================================================================ ADC_Keywords: Stars, F-type; Stars, G-type; Abundances, [Fe/H] ; Positional data ; Photometry, uvby; Radial velocities ; Stars, ages ; Stars, distances ; Stars, masses; Space velocities ; Effective temperatures Keywords: Galaxy: disk - Galaxy: solar neighbourhood - Galaxy: stellar content Galaxy: kinematics and dynamics - Galaxy: evolution - Stars: fundamental parameters Abstract (from paper II, 2007) 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. We aim to consolidate the calibrations of uvbyb photometry into T_eff_, [Fe/H], distance, and age for F and G stars and rediscuss the results of the Geneva-Copenhagen Survey (GCS, Nordstrom et al., 2004, paper I) in terms of the evolution of the disk. We use recent V-K photometry, angular diameters, high-resolution spectroscopy, Hipparcos parallaxes, and extensive numerical simulations to re-examine and verify the temperature, metallicity, distance, and reddening calibrations for the uvbyb system. We also highlight the selection effects inherent in the apparent-magnitude limited GCS sample. We substantially improve the T_eff_ and [Fe/H] calibrations for early F stars, where spectroscopic temperatures have large systematic errors. A slight offset of the GCS photometry and the non-standard helium abundance of the Hyades invalidate its use for checking metallicity or age scales; however, the distances, reddenings, metallicities, and age scale for GCS field stars require minor corrections only. Our recomputed ages are in excellent agreement with the independent determinations by Takeda et al. (2007ApJS..168..297T), indicating that isochrone ages can now be reliably determined. The revised G-dwarf metallicity distribution remains incompatible with closed-box models, and the age-metallicity relation for the thin disk remains almost flat, with large and real scatter at all ages sigma_intrinsic=0.20 dex). Dynamical heating of the thin disk continues throughout its life; specific in-plane dynamical effects dominate the evolution of the U and V velocities, while the W velocities remain random at all ages. When assigning thick and thin-disk membership for stars from kinematic criteria, parameters for the oldest stars should be used to characterise the thin disk. Abstract (from Paper I, 2004): We present and discuss new determinations of metallicity, rotation, age, kinematics and Galactic orbits for a complete, magnitude-limited, and kinematically unbiased sample of 16682 nearby F and G dwarf stars. Our  63000 new, accurate radial-velocity observations for nearly 13500 stars allow identification of most of the binary stars in the sample, and together with published uvby-beta photometry, Hipparcos parallaxes, Tycho-2 proper motions, and a few earlier radial velocities, complete the kinematic information for 14139 stars. These high-quality velocity data are supplemented by effective temperatures and metallicities newly derived from recent and/or revised calibrations. The remaining stars either lack Hipparcos data or have fast rotation. A major effort has been devoted to the determination of new isochrone ages for all stars for which this is possible. Particular attention has been given to a realistic treatment of statistical biases and error estimates, as standard techniques tend to underestimate these effects and introduce spurious features in the age distributions.

© UDS/CNRS

Contact