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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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 ?=0 2MASS J magnitude (G2)
104-108 F5.3 mag e_Jmag ?=0 Standard error (sigma) on Jmag (G2)
110-115 F6.3 mag Hmag ?=0 2MASS H magnitude (G2)
117-121 F5.3 mag e_Hmag ?=0 Standard error (sigma) on Hmag (G2)
123-128 F6.3 mag Ksmag ?=0 2MASS Ks magnitude (G2)
130-134 F5.3 mag e_Ksmag ?=0 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
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Byte-by-byte Description of file: tycdwarf.dat
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Bytes Format Units Label Explanations
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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)
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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 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 1998ApJ...500..525S)
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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)
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Acknowledgements:
S.M. Ammons, ammons(at)as.arizona.edu
(End) S. Mark Ammons [UAO, Arizona], Patricia Vannier [CDS] 05-Oct-2010