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J/A+A/535/A42       Metal rich stars in solar neighbourhood  (Trevisan+, 2011)

Analysis of old very metal rich stars in the solar neighbourhood. Trevisan M., Barbuy B., Eriksson K., Gustafsson B., Grenon M., Pompeia L. <Astron. Astrophys. 535, A42 (2011)> =2011A&A...535A..42T
ADC_Keywords: Stars, nearby ; Stars, late-type ; Abundances Keywords: stars: abundances - solar neighbourhood - stars: atmospheres Abstract: The analysis of 71 metal-rich stars is based on optical high-resolution echelle spectra obtained with the FEROS spectrograph at the ESO 1.52-m Telescope at La Silla, Chile. The metallicities and abundances of C, O, Mg, Si, Ca, and Ti were derived based on LTE detailed analysis, employing the MARCS model atmospheres. We confirm the high metallicity of these stars reaching up to [FeI/H]=0.58, and the sample of metal-rich dwarfs can be kinematically subclassified in samples of thick disk, thin disk, and intermediate stellar populations. All sample stars show solar alpha-Fe ratios, and most of them are old and still quite metal rich. The orbits suggest that the thin disk, thick disk and intermediate populations were formed at Galactocentric distances of ∼8kpc, ∼6kpc, and ∼7kpc, respectively. The mean maximum height of the thick disk subsample of Zmax∼380pc, is lower than for typical thick disk stars. A comparison of alpha-element abundances of the sample stars with bulge stars shows that the oxygen is compatible with a bulge or inner thick disk origin. Our results suggest that models of radial mixing and dynamical effects of the bar and bar/spiral arms might explain the presence of these old metal-rich dwarf stars in the solar neighbourhood. Description: Spectroscopic stellar parameters and abundances of C, O, Mg, Si, Ca, Ti and Ni for 71 stars. U, V, W velocities and orbital parameters derived using the GRINTON integrator (Carraro et al. 2002MNRAS.332..705C, Bedin et al. 2006A&A...460L..27B). Atomic data for Fe I, Fe II, Si I, Ca I, and Ti I lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 70 71 Log of spectroscopic observations tablea2.dat 45 93 Selected data from the PASTEL catalogue tablea3.dat 46 58 Si I, Ca I, and Ti I line list tablea4.dat 51 106 Fe I and Fe II line list abund.dat 189 71 Stellar parameters and abundances kinem.dat 84 71 U V W velocities and orbital parameters refs.dat 76 29 References
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Star Star name 13- 14 I2 h RAh Right ascension (J2000) 16- 17 I2 min RAm Right ascension (J2000) 19- 23 F5.2 s RAs Right ascension (J2000) 25 A1 --- DE- Declination sign (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 36 F5.2 arcsec DEs Declination (J2000) 38- 47 A10 "YYYY/MM/DD" Obs.date Date of observation 49- 56 A8 "h:m:s" Obs.Time UT time of observation 58- 61 I4 s Texp Exposure time 63- 66 F4.2 --- Airmass Airmass 68- 70 I3 --- S/N Mean signal to noise ratio
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Star Star name 14- 17 I4 K Teff Effective temperature 19- 21 I3 K e_Teff ? Error in effective temperature 23- 26 F4.2 [cm/s2] logg ? Gravity 28- 31 F4.2 [cm/s2] e_logg ? Error in gravity 33- 37 F5.2 [-] [Fe/H] ? Metallicity 39- 42 F4.2 [-] e_[Fe/H] ? Error in metallicity 44- 45 I2 --- Ref Reference code, in refs.dat file
Byte-by-byte Description of file: tablea3.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Elem Element 3 I1 --- Ion Ionization level (1=neutral) 5- 11 F7.2 0.1nm lambda Wavelength in Angstroms (Å) 13- 16 F4.2 eV Xexc Lower excitation potential χ 18- 22 F5.2 --- loggf adopted log gf-values 24- 28 F5.2 --- loggf1 ? log gf-values from Bensby et al. (2004, Cat. J/A+A/415/155) 30- 34 F5.2 --- loggf2 ? log gf-values from NIST 36- 40 F5.2 --- loggf3 log gf-values from VALD 42- 46 F5.2 --- loggf4 ? log gf-values from Barbuy et al. (2009A&A...507..405B)
Byte-by-byte Description of file: tablea4.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Elem Element 3 I1 --- Ion Ionization level (1=neutral) 5- 11 F7.2 0.1nm lambda Wavelength in Angstroms (Å) 13- 16 F4.2 eV Xexc Lower excitation potential χ 18- 27 E10.4 --- C6 C6 value (van der Waals pressure broadening) 29- 33 F5.2 --- loggf adopted log gf-values 35- 39 F5.2 --- loggf1 ? log gf-values from VALD 41- 45 F5.2 --- loggf2 ? log gf-values from NIST 47- 51 F5.2 --- loggf3 ? log gf from Melendez et al. (2009ApJ...704L..66M) for Fe I and Melendez & Barbuy (2009A&A...497..611M) for Fe II
Byte-by-byte Description of file: abund.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Star Star name 13- 16 I4 K Teff Effective temperature 18- 19 I2 K e_Teff Error in effective temperature 21- 24 F4.2 [cm/s2] logg Gravity 26- 29 F4.2 [cm/s2] e_logg Error in gravity 31- 34 F4.2 km/s vt Microturbulence velocity ξ 36- 39 F4.2 km/s e_vt Error in microturbulence velocity 41- 44 F4.2 [Sun] [Fe/H] Metallicity from Geneva photometry 46- 50 F5.2 [Sun] [FeI/H] Abundance of Fe I 52- 55 F4.2 [Sun] e_[FeI/H] Error in abundance of Fe I 57- 61 F5.2 [Sun] [FeII/H] Abundance of Fe II 63- 66 F4.2 [Sun] e_[FeII/H] Error in abundance of Fe II 68- 71 F4.2 Msun Mass ? Stellar mass 73- 76 F4.2 Msun e_Mass ? Error in stellar mass 78- 81 F4.1 Gyr Age ? Stellar age 83- 85 F3.1 Gyr e_Age ? Error in stellar age 87- 91 F5.2 [Sun] [CaI/H] Abundance of Ca 93- 96 F4.2 [Sun] e_[CaI/H] Error in abundance of Ca 98-102 F5.2 [Sun] [CaI/Fe] Ca-to-Fe ratio 104-108 F5.2 [Sun] [SiI/H] Abundance of Si 110-113 F4.2 [Sun] e_[SiI/H] Error in abundance of Si 115-119 F5.2 [Sun] [SiI/Fe] Si-to-Fe ratio 121-125 F5.2 [Sun] [TiI/H] Abundance of Ti 127-130 F4.2 [Sun] e_[TiI/H] Error in abundance of Ti 132-136 F5.2 [Sun] [TiI/Fe] Ti-to-Fe ratio 138-142 F5.2 [Sun] [C/H] ? Abundance of C 144-148 F5.2 [Sun] [C/Fe] ? C-to-Fe ratio 150-154 F5.2 [Sun] [NiI/H] Abundance of Ni 156-159 F4.2 [Sun] e_[NiI/H] Error in abundance of Ni 161-165 F5.2 [Sun] [NiI/Fe] Ni-to-Fe ratio 167-171 F5.2 [Sun] [O/H] ? Abundance of Oxygen 173-177 F5.2 [Sun] [O/Fe] ? O-to-Fe ratio 179-183 F5.2 [Sun] [Mg/H] Abundance of Magnesium 185-189 F5.2 [Sun] [Mg/Fe] Mg-to-Fe ratio
Byte-by-byte Description of file: kinem.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Star Star name 13- 16 I4 km/s Uvel U component of the velocity 18- 21 I4 km/s Vvel V component of the velocity 23- 25 I3 km/s Wvel W component of the velocity 27- 32 F6.2 km/s HV Heliocentric velocity 34- 37 F4.2 km/s e_HV Error in Heliocentric velocity 39- 42 F4.2 kpc Rmin ? Minimum distance from the Galactic centre 44- 47 F4.2 kpc e_Rmin ? Error in Rmin 49- 53 F5.2 kpc Rmax ? Maximum distance from the Galactic centre 55- 58 F4.2 kpc e_Rmax ? Error in Rmax 60- 63 F4.2 kpc Zmax ? Maximum height from the Galactic plane 65- 68 F4.2 kpc e_Zmax ? Error in Zmax 70- 73 F4.2 --- ecc ? Eccentricity of the galactic orbit 75- 78 F4.2 --- e_ecc ? Error in ecc 80- 81 I2 % P1 Probability of belonging to the thin disk 83- 84 I2 % P2 Probability of belonging to the thick disk
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference code 4- 22 A19 --- BibCode BibCode 24- 54 A31 --- Aut Author's name 57- 76 A20 --- Com Comments
Acknowledgements: Marina Trevisan, trevisan(at)astro.iag.usp.br History: * 31-Oct-2011: On-line version * 24-Feb-2012: RAm corrected in tablea1
(End) Marina Trevisan [USP, Brazil], Patricia Vannier [CDS] 07-Oct-2011
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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