J/A+A/487/373 Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)
Spectroscopic parameters for 451 stars in the HARPS GTO planet search program.
Stellar [Fe/H] and the frequency of exo-Neptunes.
Sousa S.G., Santos N.C., Mayor M., Udry S., Casagrande L., Israelian G.,
Pepe F., Queloz D., Monteiro M.J.P.F.G.
<Astron. Astrophys. 487, 373 (2008)>
=2008A&A...487..373S 2008A&A...487..373S
ADC_Keywords: Stars, double and multiple ; Planets ; Abundances ;
Effective temperatures
Keywords: methods: data analysis - methods: spectroscopy -
stars: fundamental parameters - stars: planetary systems -
stars: planetary systems: formation - Galaxy: solar neighborhood
Abstract:
To understand the formation and evolution of solar-type stars in the
solar neighborhood, we need to measure their stellar parameters to
high accuracy. We present a catalogue of accurate stellar parameters
for 451 stars that represent the HARPS Guaranteed Time Observations
(GTO) "high precision" sample. Spectroscopic stellar parameters were
measured using high signal-to-noise (S/N) spectra acquired with the
HARPS spectrograph. The spectroscopic analysis was completed assuming
LTE with a grid of Kurucz atmosphere models and the recent ARES code
for measuring line equivalent widths. We show that our results agree
well with those ones presented in the literature (for stars in
common). We present a useful calibration for the effective temperature
as a function of the index color B-V and [Fe/H]. We use our results to
study the metallicity-planet correlation, namely for very low mass
planets. The results presented here suggest that in contrast to their
jovian counterparts, Neptune-like planets do not form preferentially
around metal-rich stars. The ratio of Jupiter-to-Neptune is also an
increasing function of stellar metallicity. These results are
discussed in the context of the core-accretion model for planet
formation.
Description:
Table 1 contains the atomic parameters and measured solar equivalent
widths for FeII and Fe I lines.
Table 2 contains the spectroscopic parameters for the 451 stars in the
HARPS GTO planet search sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 30 299 Atomic parameters for iron lines
table2.dat 90 451 Spectroscopic parameters for the 451 stars
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See also:
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
J/A+A/458/873 : Metal-rich solar-type stars stellar parameters (Sousa+, 2006)
J/ApJ/637/1102 : Lick indices for metal-rich stars (Robinson+, 2006)
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lambda Central wavelength
9- 12 F4.2 --- EP Excitation potential
14- 19 F6.3 --- loggf Oscilator strength
21- 24 A4 --- El Element (FeI or FeII)
26- 30 F5.1 0.1pm EWsun Solar equivalent width
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Star name
12- 15 I4 K Teff Effective temperature
17- 19 I3 K e_Teff rms uncertainty on Teff
21- 24 F4.2 [cm/s2] logg Surface gravity
26- 29 F4.2 [cm/s2] e_logg rms uncertainty on logg
31- 34 F4.2 km/s Vtur Turbulence velocity
36- 39 F4.2 km/s e_Vtur rms uncertainty on Vtur
41- 45 F5.2 --- [Fe/H] Metallicity
47- 50 F4.2 --- e_[Fe/H] rms uncertainty on [Fe/H]
52- 54 I3 --- nFeI Number of FeI lines used
56- 57 I2 --- nFeII Number of FeII lines used
59- 63 F5.3 solMass Mass Estimation of the stellar mass
65- 68 F4.2 [cm/s2] logg(HIP) ? logg derived using Hipparcos parallax
69 A1 --- n_logg(HIP) [i] i for not determined (1)
71- 75 F5.3 [solLum] logL Stellar luminosity
77- 81 F5.3 [solLum] e_logL rms uncertainty on logL
83- 86 F4.2 mag VMAG Absolute magnitude
88- 90 A3 --- Pl? [yes no] Does the star host a known planet?
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Note (1): For those 2 stars we were not able to estimate the mass,
therefore we could not compute the logg(HIP).
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Acknowledgements:
Sergio G. Sousa, sousasag(at)astro.up.pt
(End) Sergio G. Sousa [CAUP-Porto, Portugal], Patricia Vannier [CDS] 25-Jun-2008