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 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 2002MNRAS.332..705C, Bedin et al. 2006A&A...460L..27B 2006A&A...460L..27B). Atomic data
for Fe I, Fe II, Si I, Ca I, and Ti I lines.
File Summary:
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FileName Lrecl Records Explanations
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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
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B/pastel : The PASTEL catalogue (Soubiran+, 2010-)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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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 2009A&A...507..405B)
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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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 2009ApJ...704L..66M) for Fe I and Melendez &
Barbuy (2009A&A...497..611M 2009A&A...497..611M) for Fe II
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Byte-by-byte Description of file: abund.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: kinem.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 54 A31 --- Aut Author's name
57- 76 A20 --- Com Comments
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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