J/MNRAS/367/1329 Elemental abundances for 176 stars (Reddy+, 2006)
Elemental abundance survey of the Galactic thick disc.
Reddy B.E., Lambert D.L., Prieto C.A.
<Mon. Not. R. Astron. Soc., 367, 1329-1366 (2006)>
=2006MNRAS.367.1329R 2006MNRAS.367.1329R
ADC_Keywords: Stars, nearby ; Stars, F-type ; Stars, G-type ; Abundances ;
Radial velocities ; Space velocities
Keywords: stars: abundances - stars: kinematics - Galaxy: abundances -
Galaxy: evolution
Abstract:
We have performed an abundance analysis for F- and G- dwarfs of the
Galactic thick-disc component. A sample of 176 nearby (d≤150pc)
thick-disc candidate stars was chosen from the Hipparcos catalogue and
subjected to a high-resolution spectroscopic analysis. Using accurate
radial velocities combined with the Hipparcos astrometry, kinematics
(U, V and W) and Galactic orbital parameters were computed. We
estimate the probability for a star to belong to the thin disc, the
thick disc or the halo. With a probability P≥70 per cent taken as
certain membership, we assigned 95 stars to the thick disc, 13 to the
thin disc, and 20 to the halo. The remaining 48 stars in the sample
cannot be assigned with reasonable certainty to one of the three
components.
Abundances of C, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni,
Cu, Zn, Y, Ba, Ce, Nd and Eu have been obtained.
Description:
High-resolution spectra of the program stars were obtained during the
period 2002 December-2004 June at the Harlan J. Smith 2.7-m telescope
of the W.J. McDonald Observatory, using the 2dcoude echelle
spectrometer with a 2048x2048 Tektronix CCD as detector.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 102 176 Atmospheric parameters and kinematic data for
the program stars
table45.dat 167 176 Abundance ratios [X/Fe] for elements from C to Eu
for the program stars
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Group Group (G1)
18- 23 I6 --- HIP HIP number
25- 29 F5.2 Sun [Fe/H] Metallicity
31- 34 I4 K Teff ? Effective temperature
36- 39 F4.2 [cm/s2] logg ? Surface gravity
41- 46 F6.1 km/s HRV ? Heliocentric radial velocity
48- 53 F6.1 km/s ULSR ? LSR U velocity
55- 58 I4 km/s VLSR ? LSR V velocity
60- 63 I4 km/s WLSR ? LSR W velocity
65- 70 F6.2 kpc Rm ? Mean Galactocentric distance
72- 75 F4.2 --- e ? Eccentricity
77- 82 F6.2 kpc Zmax ? Maximum distance above the Galactic plane
84- 88 F5.2 Gyr tau9 ?=- Age
90- 92 F3.1 Gyr E_tau9 ? Error on Age (upper limit)
94- 96 F3.1 Gyr e_tau9 ? Error on Age (lower limit)
98- 99 I2 % Pr ? Probability that the star belongs to Group
101-102 I2 % e_Pr ? rms uncertainty on P
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Byte-by-byte Description of file: table45.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Group Group (G1)
18- 23 I6 --- HIP HIP number
25- 29 F5.2 Sun [FeI/H] Abundance ratio [FeI/H]
31- 35 F5.2 Sun [C/Fe] ?=- Abundance ratio [C/Fe]
37- 41 F5.2 Sun [O/Fe] ?=- Abundance ratio [O/Fe], not corrected
for the NLTE effect
43- 47 F5.2 Sun [Na/Fe] ?=- Abundance ratio [Na/Fe]
49- 53 F5.2 Sun [Mg/Fe] ?=- Abundance ratio [Mg/Fe]
55- 59 F5.2 Sun [Al/Fe] ?=- Abundance ratio [Al/Fe]
61- 65 F5.2 Sun [Si/Fe] ?=- Abundance ratio [Si/Fe]
67- 71 F5.2 Sun [Ca/Fe] ?=- Abundance ratio [Ca/Fe]
73- 77 F5.2 Sun [Sc/Fe] ?=- Abundance ratio [Sc/Fe]
79- 83 F5.2 Sun [Ti/Fe] ?=- Abundance ratio [Ti/Fe]
85- 89 F5.2 Sun [V/Fe] ?=- Abundance ratio [V/Fe]
91- 95 F5.2 Sun [Fe/H] Abundance ratio [Fe/H]
97-101 F5.2 Sun [Cr/Fe] ?=- Abundance ratio [Cr/Fe]
103-107 F5.2 Sun [Mn/Fe] ?=- Abundance ratio [Mn/Fe]
109-113 F5.2 Sun [Co/Fe] ?=- Abundance ratio [Co/Fe]
115-119 F5.2 Sun [Ni/Fe] ?=- Abundance ratio [Ni/Fe]
121-125 F5.2 Sun [Cu/Fe] ?=- Abundance ratio [Cu/Fe]
127-131 F5.2 Sun [Zn/Fe] ?=- Abundance ratio [Zn/Fe]
133-137 F5.2 Sun [Y/Fe] ?=- Abundance ratio [Y/Fe]
139-143 F5.2 Sun [Ba/Fe] ?=- Abundance ratio [Ba/Fe]
145-151 F7.2 Sun [Ce/Fe] ?=- Abundance ratio [Ce/Fe]
153-159 F7.2 Sun [Nd/Fe] ?=- Abundance ratio [Nd/Fe]
161-167 F7.2 Sun [Eu/Fe] ?=- Abundance ratio [Eu/Fe]
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Global Notes:
Note (G1): the population Group is the
Thin disc, the Thick disc or the Halo.
History:
* 30-Nov-2006: From electronic version of the journal
* 13-Jan-2017: Corrections in table45.dat. Abuncances relative
to Fe instead af H (noticed by Esma Yaz Cokce)
(End) Patricia Vannier [CDS] 26-Sep-2006