==========================================================================
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.cds.unistra.fr/viz-bin/VizieR?-source=V/136
==========================================================================
drwxr-xr-x 146 cats archive 4096 Aug 1 2023 [Up]
drwxr-xr-x 5 cats archive 4096 Jan 12 2023 [TAR file]
-rw-r--r-- 1 cats archive 473 Dec 19 2022 .message
-r--r--r-- 1 cats archive 10271 Jan 21 2015 ReadMe
-rw-r--r-- 1 cats archive 2934 Jan 21 2015 +footg5.gif
-rw-r--r-- 1 cats archive 51481 Jan 21 2015 +footg8.gif
-r--r--r-- 1 cats archive 164446868 Oct 5 2010 tycall.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 64332281 Oct 5 2010 tycdwarf.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
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.