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The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of 14 000 F and G dwarfs
We present and discuss new determinations of metallicity, rotation, age,kinematics, and Galactic orbits for a complete, magnitude-limited, andkinematically unbiased sample of 16 682 nearby F and G dwarf stars. Our63 000 new, accurate radial-velocity observations for nearly 13 500stars allow identification of most of the binary stars in the sampleand, together with published uvbyβ photometry, Hipparcosparallaxes, Tycho-2 proper motions, and a few earlier radial velocities,complete the kinematic information for 14 139 stars. These high-qualityvelocity data are supplemented by effective temperatures andmetallicities newly derived from recent and/or revised calibrations. Theremaining stars either lack Hipparcos data or have fast rotation. Amajor effort has been devoted to the determination of new isochrone agesfor all stars for which this is possible. Particular attention has beengiven to a realistic treatment of statistical biases and errorestimates, as standard techniques tend to underestimate these effectsand introduce spurious features in the age distributions. Our ages agreewell with those by Edvardsson et al. (\cite{edv93}), despite severalastrophysical and computational improvements since then. We demonstrate,however, how strong observational and theoretical biases cause thedistribution of the observed ages to be very different from that of thetrue age distribution of the sample. Among the many basic relations ofthe Galactic disk that can be reinvestigated from the data presentedhere, we revisit the metallicity distribution of the G dwarfs and theage-metallicity, age-velocity, and metallicity-velocity relations of theSolar neighbourhood. Our first results confirm the lack of metal-poor Gdwarfs relative to closed-box model predictions (the ``G dwarfproblem''), the existence of radial metallicity gradients in the disk,the small change in mean metallicity of the thin disk since itsformation and the substantial scatter in metallicity at all ages, andthe continuing kinematic heating of the thin disk with an efficiencyconsistent with that expected for a combination of spiral arms and giantmolecular clouds. Distinct features in the distribution of the Vcomponent of the space motion are extended in age and metallicity,corresponding to the effects of stochastic spiral waves rather thanclassical moving groups, and may complicate the identification ofthick-disk stars from kinematic criteria. More advanced analyses of thisrich material will require careful simulations of the selection criteriafor the sample and the distribution of observational errors.Based on observations made with the Danish 1.5-m telescope at ESO, LaSilla, Chile, and with the Swiss 1-m telescope at Observatoire deHaute-Provence, France.Complete Tables 1 and 2 are only available in electronic form at the CDSvia anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/418/989
| Photometric Measurements of the Fields of More than 700 Nearby Stars
In preparation for optical/IR interferometric searches for substellarcompanions of nearby stars, we undertook to characterize the fields ofall nearby stars visible from the Northern Hemisphere to determinesuitable companions for interferometric phase referencing. Because theKeck Interferometer in particular will be able to phase-reference oncompanions within the isoplanatic patch (30") to about 17th magnitude atK, we took images at V, r, and i that were deep enough to determine iffield stars were present to this magnitude around nearby stars using aspot-coated CCD. We report on 733 fields containing 10,629 measurementsin up to three filters (Gunn i, r and Johnson V) of nearby stars down toabout 13th magnitude at V.
| Mesures de vitesses radiales. VIII. Accompagnement AU sol DU programme d'observation DU satellite HIPPARCOS
We publish 1879 radial velocities of stars distributed in 105 fields of4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbachet al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90}using the Fehrenbach objective prism method. Table 1 only available inelectronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Coronae on solar-like stars.
The results of a complete and sensitive X-ray survey of all known starsof spectral type A, F, and G in the immediate solar vicinity withdistances less than 13pc are presented. The X-ray data were obtainedprimarily from the ROSAT all-sky survey (RASS); those program stars notdetected in the RASS data, were subsequently studied in the ROSATpointed observation program. The detection rate among the F stars in thesample is 95%, that of the G stars 83%, the non-detections being due tosurvey observations. On the other hand, none of the A-stars withspectral type earlier than A7 could be detected even in sensitivepointings. I conclude from this that coronal formation in stars withsurface convection zones is universal. The X-ray luminosities range overabout four orders of magnitude, and can be well described with alog-normal distribution. Large X-ray outputs are correlated withkinematic age as assessed from space motions. I show the existence of acorrelation between the total emitted X-ray surface flux and spectralhardness, such that more luminous objects tend to have larger spectralhardness, thus implying higher coronal temperatures. The mean X-raysurface fluxes span the same range as is observed for various solarcoronal features, with a rather well-defined minimum X-ray flux beingpresent; this minimum X-ray surface flux agrees very well with the X-raysurface flux of solar coronal holes. It therefore appears that a coronalhole represents the minimum state of "activity" not only for the Sun butalso for other stars. I discuss a few implications of this findingespecially with regard to properties of stars in Maunder minima states.
| Preliminary Version of the Third Catalogue of Nearby Stars
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| Takýmyýldýz: | Yengec |
| Sað Açýklýk: | 08h14m31.97s |
| Yükselim: | +10°11'17.9" |
| Görünürdeki Parlaklýk: | 7.296 |
| Uzaklýk: | 180.832 parsek |
| özdevim Sað Açýklýk: | -13.9 |
| özdevim Yükselim: | 3.1 |
| B-T magnitude: | 8.57 |
| V-T magnitude: | 7.402 |
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