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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 30 299 Atomic parameters for iron lines table2.dat 90 451 Spectroscopic parameters for the 451 stars
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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?
Note (1): For those 2 stars we were not able to estimate the mass, therefore we could not compute the logg(HIP).
Acknowledgements: Sergio G. Sousa, sousasag(at)astro.up.pt
(End) Sergio G. Sousa [CAUP-Porto, Portugal], Patricia Vannier [CDS] 25-Jun-2008
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