The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs
By S. Ammons, S. E. Robinson, J. Strader, Gregory Laughlin, Debra A. Fischer, A. Wolf. 2005
165 citations recorded by the source corpus.
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 Teff and distance for 2.4 × 106 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 σV < 0.05, or V < 9, our temperature model gives a 1 σ error of σT = +58.7/ - 65.9 K and our metallicity model gives a 1 σ error of σ[Fe/H] = +0.13/ - 0.14 dex. 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 0.13-0.3 dex [Fe/H] accuracy and 80-100 K temperature accuracy (1 σ). 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.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/411371762f8d9956ac4e3add50ccdbc0852df435
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Citations in the corpus
- A CHARA ARRAY SURVEY OF CIRCUMSTELLAR DISKS AROUND NEARBY Be-TYPE STARS (2013, methodology): “Note that we generally used Johnson U magnitudes compiled by Karataş & Schuster (2006) and B, V magnitudes from Ammons et al. (2006), who list Tycho B and V magnitudes that are slightly different from Johnson B, V magnitudes.”
- A UNIFORM ASTEROSEISMIC ANALYSIS OF 22 SOLAR-TYPE STARS OBSERVED BY KEPLER (2012, methodology): “For seven stars, we also had constraints on the luminosity via the parallaxes from van Leeuwen (2007a,b), and the JohnsonV and galactic extinctionE(B − V ) from the Tycho catalog (Ammons et al. 2006).”
- Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program - Galactic stellar populations and planets (2012, background): “We note that the observed low bimodality in T eff for all three groups (with a minimum in T eff ≈ 5300 K) are inherited from the Hipparcos catalog (see e.g. Ammons et al. (2006) for the T eff distribution of Hipparcos stars), on which the HARPS sample is based.”
- Efficient identification of exoplanetary transit candidates from SuperWASP light curves (2007, methodology): “J − H The 2MASS J −H colour index was calibrated using stellar temperatures from a sample of 100,000 Tycho-2 FGK dwarf stars from Ammons et al. (2006), selected to assist in target selection for radial-velocity planet searches.”
- SEISMIC EVIDENCE FOR A RAPIDLY ROTATING CORE IN A LOWER-GIANT-BRANCH STAR OBSERVED WITH KEPLER (2012, background): “The star was found to be very metal-poor relative to the Sun — values quoted in the literature range from −2.18 dex (Laird et al. 1988) to −0.79 dex (Ammons et al. 2006).”