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J/A+A/530/A15       Abundances of 94 stars                   (Nissen+, 2011)

Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba. Nissen P.E., Schuster W.J. <Astron. Astrophys. 530, A15 (2011)> =2011A&A...530A..15N
ADC_Keywords: Stars, nearby ; Abundances ; Equivalent widths Keywords: stars: atmospheres - stars: abundances - Galaxy: abundances - Galaxy: halo - Galaxy: formation Abstract: Abundances of Mn, Cu, Zn, Y, and Ba are determined for a sample of stars previously studied by Nissen & Schuster (2010, Cat. J/A+A/511/L10). Equivalent widths of atomic lines are measured from high resolution VLT/UVES and NOT/FIES spectra and used to derive abundance ratios from an LTE analysis based on MARCS model atmospheres. The analysis is made relative to two thick-disk stars, HD22879 and HD76932, such that very precise differential values are obtained. Description: Atmospheric parameters and abundance ratios, [Mn/Fe], [Cu/Fe], [Zn/Fe], [Y/Fe], and [Ba/Fe], are given for 78 halo stars and 16 thick-disk stars observed with the ESO VLT/UVES and NOT/FIES spectrographs at high resolution. Six stars, G20-15, HD148816, HD179626, HD189558, HD193901 and HD194598 have been observed with the two spectrographs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 75 53 Data based on VLT/UVES spectra table2.dat 75 47 Data based on NOT/FIES spectra table3u.dat 46 10388 Equivalent widths from VLT/UVES spectra table3f.dat 46 9212 Equivalent widths from NOT/FIES spectra
See also: J/A+A/511/L10 : Abundances and space velocities of 94 stars (Nissen+, 2010) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name 11 A1 --- m_Name Multiplicity index on Name 13- 16 I4 K Teff Effective temperature 18- 21 F4.2 [cm/s2] logg Logarithmic surface gravity 23- 27 F5.2 [Sun] [Fe/H] Iron-to-hydrogen ratio 29- 32 F4.2 [Sun] [a/Fe] alpha-to-iron ratio (1) 34- 38 F5.2 [Sun] [Mn/Fe] Manganese-to-iron ratio 40- 44 F5.2 [Sun] [Cu/Fe] ? Copper-to-iron ratio 46- 50 F5.2 [Sun] [Zn/Fe] Zinc-to-iron ratio 52- 56 F5.2 [Sun] [Y/Fe] Yttrium-to-iron ratio 58- 62 F5.2 [Sun] [Ba/Fe] Barium-to-iron ratio 64- 75 A12 --- Class Population (2)
Note (1): [α/Fe] is defined as 1/4([Mg/Fe]+[Si/Fe]+[Ca/Fe]+[Ti/Fe]). Note (2): Classification of star as belonging to the thick-disk (TD), the low-α halo, or the high-α halo population. For stars with [Fe/H]←1.4, the classification is uncertain and given in parentheses.
Byte-by-byte Description of file: table3?.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name 11 A1 --- m_Name Multiplicity index on Name 14- 17 A4 --- Ion Chemical element and ionization stage 20- 26 F7.2 0.1nm lambda Wavelength of line (Å) 30- 33 F4.2 eV chi.ex Excitation energy of lower level 36- 40 F5.2 --- loggf Logarithmic oscillator strength (1) 42- 46 F5.1 0.1pm EW ? Equivalent width (mÅ)
Note (1): log(gf) is determined from an "inverted" abundance analysis of the two standard stars, HD22879 and HD76932.
Acknowledgements: Poul Erik Nissen, pen(at)phys.au.dk
(End) Poul Erik Nissen [Aarhus University], Patricia Vannier [CDS] 14-Apr-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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