J/A+A/587/A131 Solar twins in the ELODIE archive (Mahdi+, 2016)
Solar twins in the ELODIE archive.
Mahdi D., Soubiran C., Blanco-Cuaresma S., Chemin L.
<Astron. Astrophys. 587, A131 (2016)>
=2016A&A...587A.131M 2016A&A...587A.131M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Abundances ; Effective temperatures
Keywords: stars: atmospheres - stars: abundances -
stars: fundamental parameters - stars: solar-type
Abstract:
A large dataset of ∼2800 spectra extracted from the ELODIE archive was
analysed in order to find solar twins. Stellar spectra closely
resembling the spectrum of the Sun were selected by applying a purely
differential method, directly on the fluxes. As solar reference, 18
spectra of asteroids, of the Moon, and of the blue sky were used.
Atmospheric parameters and differential abundances of eight chemical
elements were determined for the solar twin candidates after a careful
selection of appropriate lines. The Li feature of the targets was
investigated and additional information on absolute magnitude and age
was gathered from the literature. HIP076114 (HD138573) is our best
twin candidate; it looks exactly like the Sun in all these properties.
Description:
Atmospheric parameters and very precise abundances relative to the Sun
are provided for the 56 best solar twin candidates. Other properties
of these stars have been extracted from the XHIP catalogue by Anderson
& Francis (2012, Cat. J/PAZh/38/763). The solar twin candidates are
classified according to their similarity to the Sun. The line list
used for the determination of abundances is also provided.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableap.dat 64 56 Atmospheric parameters
tableab.dat 177 56 Abundances
tablxhip.dat 116 56 Data from XHIP
linelist.dat 43 267 Line list
refs.dat 200 35 References of the line list
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See also:
J/A+A/501/687 : Evolutionnary models for solar twins (do Nascimento+, 2009)
J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)
J/A+A/544/A106 : p-mode frequencies of the solar twin 18 Sco (Bazot+, 2012)
J/A+A/574/A124 : Spectroscopy of solar twins and analogues (Datson+, 2015)
J/PAZh/38/763 : XHIP-II: Clusters and associations (Francis+, 2012)
Byte-by-byte Description of file: tableap.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Designation HIP/TYC
19- 22 I4 K Teff Effective temperature
25- 26 I2 K e_Teff Uncertainty on effective temperature
30- 33 F4.2 [cm/s2] logg Logarithm of gravity
37- 40 F4.2 [cm/s2] e_logg Uncertainty on the logarithm of gravity
43- 47 F5.2 [Sun] [M/H] Global metallicity relative to the Sun
51- 54 F4.2 [Sun] e_[M/H] Uncertainty on the global metallicity
58 I1 --- Nspe Number of spectra analysed
61 A1 --- FlagAP [ABC] AP similarity to the Sun (1)
64 A1 --- FlagLi [ABC] Li similarity to the Sun (2)
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Note (1): AP similarity to the Sun flags as follows:
A = stars which differ from the Sun by less than 25K in Teff and by 0.05dex
in logg and [M/H]
B = stars which differ from the Sun by less than 100K in Teff and by 0.1dex
in logg and [M/H]
C = other stars
Note (2): Li similarity to the Sun flags as follows:
A = stars which have a Li feature at ∼670.78nm visually similar to that of
the Sun
B = stars which have a more pronounced Li feature
C = stars which have a strong Li feature
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Byte-by-byte Description of file: tableab.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Designation HIP/TYC
17- 22 F6.3 [Sun] [Fe1/H] Iron (neutral) abundance relative to the Sun
24- 28 F5.3 [Sun] e_[Fe1/H] Uncertainty of [Fe1/H]
31- 33 I3 --- n_[Fe1/H] Number of lines analysed
35- 40 F6.3 [Sun] [Fe2/H] Iron (ionised) abundance relative to the Sun
42- 46 F5.3 [Sun] e_[Fe2/H] Uncertainty of [Fe2/H]
49- 51 I3 --- n_[Fe2/H] Number of lines analysed
53- 58 F6.3 [Sun] [Si/H] Silicium abundance relative to the Sun
60- 64 F5.3 [Sun] e_[Si/H] Uncertainty of [Si/H]
67- 69 I3 --- n_[Si/H] Number of lines analysed
71- 76 F6.3 [Sun] [Ca/H] Calcium abundance relative to the Sun
78- 82 F5.3 [Sun] e_[Ca/H] Uncertainty of [Ca/H]
85- 87 I3 --- n_[Ca/H] Number of lines analysed
89- 94 F6.3 [Sun] [Ti/H] Titanium abundance relative to the Sun
96-100 F5.3 [Sun] e_[Ti/H] Uncertainty of [Ti/H]
103-105 I3 --- n_[Ti/H] Number of lines analysed
107-112 F6.3 [Sun] [Cr/H] Chromium abundance relative to the Sun
114-118 F5.3 [Sun] e_[Cr/H] Uncertainty of [Cr/H]
121-123 I3 --- n_[Cr/H] Number of lines analysed
125-130 F6.3 [Sun] [Na/H] Natrium abundance relative to the Sun
132-136 F5.3 [Sun] e_[Na/H] Uncertainty of [Na/H]
139-141 I3 --- n_[Na/H] Number of lines analysed
143-148 F6.3 [Sun] [Mn/H] Manganese abundance relative to the Sun
150-154 F5.3 [Sun] e_[Mn/H] Uncertainty of [Mn/H]
157-159 I3 --- n_[Mn/H] Number of lines analysed
161-166 F6.3 [Sun] [Ni/H] Nickel abundance relative to the Sun
168-172 F5.3 [Sun] e_[Ni/H] Uncertainty of [Ni/H]
175-177 I3 --- n_[Ni/H] Number of lines analysed
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Byte-by-byte Description of file: tablxhip.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Designation HIP/TYC
19- 26 A8 --- HD Designation HD (HDNNNNNN)
37- 41 F5.2 pc Dist ? Heliocentric distance
45- 54 A10 --- SpType ? MK spectral type
56- 60 F5.3 mag B-V B-V colour index
64- 67 F4.2 mag VMAG ? V absolute magnitude
70- 75 F6.1 km/s Uvel ? Heliocentric velocity towards Galactic center
78- 83 F6.1 km/s Vvel ? Heliocentric velocity towards Galactic rotation
86- 91 F6.1 km/s Wvel ? Heliocentric velocity towards North Galactic
pole
94- 97 F4.1 Gyr Age ? Age
100-103 F4.1 Gyr b_Age ? Lower confidence limit on Age
107-110 F4.1 Gyr B_Age ? Upper confidence limit on Age
116 A1 --- Flag [ABC] compatibility with the Sun (1)
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Note (1): Are Mv and age of the star compatible with the solar values ?
A = yes
B = possibly
C = No
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Byte-by-byte Description of file: linelist.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 0.1nm lambda Central wavelength of the line
11- 12 A2 --- El Element
14 A1 --- Ion Ionisation stage of the line
17- 22 F6.3 --- loggf Oscillation strength of the line
26- 30 F5.3 eV EP Excitation potential of the line
32- 33 A2 --- FlagGES [NUY-] Quality flag from Gaia-ESO line list
35- 43 A9 --- r_loggf References for loggf
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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 number
4- 22 A19 --- BibCode BibCode
24- 47 A24 --- Aut Auhtor's name
49-200 A152 --- Com Comments
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Acknowledgements:
Caroline Soubiran, caroline.soubiran(at)u-bordeaux.fr
Laboratoire d'Astrophysique de Bordeaux
(End) C. Soubiran [Lab. d'Astrophys. de Bordeaux], P. Vannier [CDS] 29-Jan-2016