J/A+A/381/500 Eu abundances in F and G disk stars (Koch+, 2002)
Eu abundances in F and G disk stars.
Koch A., Edvardsson B.
<Astron. Astrophys. 381, 500 (2002)>
=2002A&A...381..500K 2002A&A...381..500K
ADC_Keywords: Abundances, peculiar ; Stars, F-type ; Stars, G-type
Keywords: stars: abundances - Galaxy: abundances
Abstract:
Europium abundances for 74 F and G dwarf stars of the galactic disk
have been determined. The stars were selected from the sample of
Edvardsson et al. (1993, Cat. J/A+A/275/101) and [Eu/Fe] shows a
smaller scatter and a slightly weaker trend with [Fe/H] than found by
Woolf et al. (1995ApJ...453..660W 1995ApJ...453..660W). The data of the two analyses are
homogeneized and merged.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 24 32 Isotopic and hyperfine structure line components
for the 4129.7Å Eu II line
table5.dat 33 74 Eu abundances for the programme stars, and
Fe abundances and ages
table6.dat 33 125 Homogenized and merged abundance data for the
present sample and the data of Woolf V.M.,
Tomkin J., and Lambert D.L. 1995ApJ...453..660W 1995ApJ...453..660W,
Fe abundances and ages
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See also:
J/A+A/275/101 : Chemical evolution of the galactic disk I. (Edvardsson+ 1993)
J/A+AS/102/603 : Chemical evolution of the galactic disk II. (Edvardsson+ 1993)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 0.1nm Wavel Wavelength [Angstroems]
11- 13 I3 --- Isotop [151,153] Mass number, 151 or 153
15- 20 F6.3 --- loggf Relative log gf assuming isotope ratio 50/50
22- 24 F3.1 0.1pm EW Solar equivalent width [milliAngstroems]
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Byte-by-byte Description of files: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Cat Catalogue, HR or HD
4- 9 I6 --- No Entry number in the catalogue
11- 15 F5.2 --- [Eu/H] Ratio [Eu/H] (from Eu II 4129.7Å) (1)
17- 21 F5.2 --- [Fe/H] Ratio [Fe/H] (from Fe II, from Edvardsson et
al., 1993, Cat. J/A+A/275/101) (1)
23- 27 F5.2 --- [Eu/Fe] Ratio [Eu/Fe] (= [Eu/H]-[Fe/H]) (1) (3)
29- 33 F5.2 [Gyr] logAge ? log (stellar age/1Gyr) (3) (2)
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Note (1): [X/Y] = log(N(X)/N(Y))star - log(N(X)/N(Y))Sun where N(X)/N(Y)
is the ratio of the total number densities of elements X and Y
in the stellar and solar atmospheres
Note (2): Ages for five stars are undetermined, then the field is left blank
Note (3): Fe abundances and ages from Edvardsson B, Andersen J., Gustafsson B.,
Lambert D.L., Nissen P.E., Tomkin J. 1993, Cat. J/A+A/275/101
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Acknowledgements: Bengt Edvardsson
(End) Bengt Edvardsson [UAO] 07-Nov-2001