========================================================================== V/136 Teff and metallicities for Tycho-2 stars (Ammons+, 2006) The following files can be converted to FITS (extension .fit or fit.gz) tycall.dat tycdwarf.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=V/136 ==========================================================================
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Beginning of ReadMe : V/136 Teff and metallicities for Tycho-2 stars (Ammons+, 2006) ================================================================================ The N2K consortium. IV. New temperatures and metallicities for more than 100,000 FGK dwarfs. Ammons S.M., Robinson S.E., Strader J., Laughlin G., Fischer D., Wolf A. <Astrophys. J., 638, 1004-1017 (2006)> =2006ApJ...638.1004A ================================================================================ ADC_Keywords: Binaries, spectroscopic ; Abundances, [Fe/H] ; Proper motions ; Effective temperatures ; Photometry, five-color ; Stars, dwarfs Keywords: catalogs - methods: data analysis - methods: statistical - stars: abundances - stars: distances - stars: statistics Abstract: 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 proper motion found in Hipparcos/Tycho 2 and 2MASS. We provide estimates of effective temperature and distance for 2.4 million Tycho 2 stars that lack trigonometric distances. For stars that appear to be FGK dwarfs, we also derive [Fe/H] and identify unresolved binary systems with mass ratios 1.25<M1/M2<3.0. For FGK dwarfs with photometric error sigma_V_<0.05, or V<9, our temperature model gives a 1sigma error of sigma_T_=+58.7/-65.9K and our metallicity model gives a 1sigma error of sigma_[Fe/H]_=+0.13/-0.14dex. The binarity model can be used to remove 70% of doubles with 1.25<M1/M2<3.0 from a magnitude-limited sample of dwarfs at a cost of cutting 20% of the sample. Our estimates of distance and spectral type enable us to isolate 354,822 Tycho 2 dwarfs, 321,996 absent from Hipparcos, with giant contamination of 2.6% and 7.2%, respectively. Roughly 100,000 of these stars, not in Hipparcos, have sufficiently low photometric errors to retain 0.13-0.3dex [Fe/H] accuracy and 80-100K temperature accuracy (1sigma). Our metallicity estimates have been used to identify targets for N2K, a large-scale radial velocity search for hot jupiters, which has verified the errors presented here. The catalogs that we publish can be used to further large-scale studies of Galactic structure and chemical evolution and to provide potential reference stars for narrow-angle astrometry programs such as the Space Interferometry Mission and large-aperture optical interferometry. Description: Photometric parameters for 2.4 million Tycho stars, including B and V from the Hipparcos mission (Perryman et al., 1997, Cat.I/239/) and J, H, and K from 2MASS (Cutri et al., 2003, Cat. II/246), including standard errors. Proper motions from Hipparcos are also included. Temperatures and distances are estimated from broadband B,V,J,H, and K photometry for dwarfs and giants. For dwarf stars, [Fe/H] metallicity, probability of multiplicity, and more precise effective temperature are estimated from polynomials of broadband colors.