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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 σV<0.05, or V<9, our temperature model gives a 1σ error of σT=+58.7/-65.9K and our metallicity model gives a 1σ error of σ[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 (1σ). 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tycall.dat 200 2399792 Photometry and derived parameters for all Tycho 2 stars, including giants tycdwarf.dat 334 611798 Photometry and derived parameters for dwarfs
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) http://www.ucolick.org/~ammons/tycho_parameters : Home Page Byte-by-byte Description of file: tycall.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Tycho Tycho identification (G1) 14- 19 I6 --- HIP ?=0 Hipparcos identification number (G1) 21- 30 F10.6 deg RAdeg Right Ascension IRCS, Ep=J2000 (degrees) (G1) 32- 41 F10.6 deg DEdeg Declination IRCS, Ep=J2000 (degrees) (G1) 43- 49 F7.2 mas/yr pmRA ?=* Proper motion parallel to RA (G1) 51- 57 F7.2 mas/yr pmDE ?=* Proper motion parallel to DE (G1) 59- 63 F5.2 mas/yr e_pmRA Standard error (sigma) on pmRA (G1) 65- 69 F5.2 mas/yr e_pmDE Standard error (sigma) on pmDE (G1) 71- 76 F6.3 mag Bmag HIP BT magnitude (G1) 78- 82 F5.3 mag e_Bmag Standard error (sigma) on Bmag (G1) 84- 89 F6.3 mag Vmag HIP VT magnitude (G1) 91- 95 F5.3 mag e_Vmag Standard error (sigma) on Vmag (G1) 97-102 F6.3 mag Jmag 2MASS J magnitude (G2) 104-108 F5.3 mag e_Jmag Standard error (sigma) on Jmag (G2) 110-115 F6.3 mag Hmag 2MASS H magnitude (G2) 117-121 F5.3 mag e_Hmag Standard error (sigma) on Hmag (G2) 123-128 F6.3 mag Ksmag 2MASS Ks magnitude (G2) 130-134 F5.3 mag e_Ksmag Standard error (sigma) on Ksmag (G2) 136-145 F10.3 K Teff ?=99999 Effective temperature (coarse spline) 148-156 F9.3 K E_Teff ?=99999 Positive error bar (sigma) on Te 159-167 F9.3 K e_Teff ?=99999 Negative error bar (sigma) on Te 169-178 F10.3 pc Dist ?=9999 Estimated distance 181-189 F9.3 pc E_Dist ?=9999 Positive error bar (sigma) on Dist 192-200 F9.3 pc e_Dist ?=9999 Negative error bar (sigma) on Dist
Byte-by-byte Description of file: tycdwarf.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Tycho Tycho identification (G1) 14- 19 I6 --- HIP ?=0 Hipparcos identification number (G1) 21- 30 F10.6 deg RAdeg Right Ascension J2000 (degrees) (G1) 32- 41 F10.6 deg DEdeg Declination J2000 (degrees) (G1) 43- 49 F7.2 mas/yr pmRA ?=* Proper motion parallel to RA (G1) 51- 57 F7.2 mas/yr pmDE ?=* Proper motion parallel to DE (G1) 59- 63 F5.2 mas/yr e_pmRA Standard error (sigma) on pmRA (G1) 65- 69 F5.2 mas/yr e_pmDE Standard error (sigma) on pmDE (G1) 71- 76 F6.3 mag Bmag Tycho B magnitude (G1) 78- 82 F5.3 mag e_Bmag Standard error (sigma) on Bmag (G1) 84- 89 F6.3 mag Vmag Tycho V magnitude (G1) 91- 95 F5.3 mag e_Vmag Standard error (sigma) on Vmag (G1) 97-102 F6.3 mag Jmag 2MASS J magnitude (G2) 104-108 F5.3 mag e_Jmag Standard error (sigma) on Jmag (G2) 110-115 F6.3 mag Hmag 2MASS H magnitude (G2) 117-121 F5.3 mag e_Hmag Standard error (sigma) on Hmag (G2) 123-128 F6.3 mag Ksmag 2MASS Ks magnitude (G2) 130-134 F5.3 mag e_Ksmag Standard error (sigma) on Ksmag (G2) 136-145 F10.3 K Teff ?=99999 Effective temperature (coarse spline) 148-156 F9.3 K E_Teff ?=99999 Positive error bar (sigma) on Teff 159-167 F9.3 K e_Teff ?=99999 Negative error bar (sigma) on Teff 169-178 F10.3 pc Dist Estimated distance 181-189 F9.3 pc E_Dist Positive error bar (sigma) on Dist 192-200 F9.3 pc e_Dist Negative error bar (sigma) on Dist 202-211 F10.3 K TeffF ?=99999 Effective temperature (fine spline) (3) 214-222 F9.3 K E_TeffF Positive error bar (sigma) on TeffF 225-233 F9.3 K e_TeffF Negative error bar (sigma) on TeffF 235-241 F7.3 [Sun] [Fe/H] Estimated Metallicity ([Fe/H]) 243-249 F7.3 [Sun] E_[Fe/H] Positive error bar (sigma) on [Fe/H] 251-257 F7.3 [Sun] e_[Fe/H] Negative error bar (sigma) on [Fe/H] 259-268 F10.6 --- pM ? Probability of Multiplicity (KTG IMF) (4) 271-279 F9.6 --- E_pM Positive error bar (sigma) on pM 282-290 F9.6 --- e_pM Negative error bar (sigma) on pM 292-301 F10.6 --- pMm ? Probability of Multiplicity (modified KTG IMF) (5) 304-312 F9.6 --- E_pMm Positive error bar (sigma) on pMm 315-323 F9.6 --- e_pMm Negative error bar (sigma) on pMm 325-334 F10.6 mag E(B-V) Foreground Galactic extinction (6)
Note (3): * "Fine spline" temperature calibration is trained on dwarf stars and is more accurate than the "Coarse spline" for dwarfs. * The "coarse spline" temperature calibration is to be used on both giants and dwarfs. Note (4): KTG IMF: Kroupa, Tout & Gilmore (1993MNRAS.262..545K) Note (5): modified KTG IMG has a slope of α=-2.35 for masses above solar as opposed to α=-2.7 Note (6): Foreground Galactic extinction from Schlegel et al. (1998ApJ...500..525S)
Global notes: Note (G1): obtained from Hipparcos/Tycho 2 catalog (Hog et al. 2000, Cat. I/259) Note (G2): obtained from 2MASS Point Source catalog (Cutri et al. 2003, Cat. II/146; Skrutskie et al., 2006, Cat. VII/233)
Acknowledgements: S.M. Ammons, ammons(at)as.arizona.edu
(End) S. Mark Ammons [UAO, Arizona], Patricia Vannier [CDS] 05-Oct-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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