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J/A+A/305/245                      Fe I in metal-poor stars (Magain+, 1996)

Empirical study of departures from the excitation equilibrium of Fe I in metal-poor stars Magain P., Zhao G. <Astron. Astrophys. 305, 245 (1996)> =1996A&A...305..245M (SIMBAD/NED BibCode)
ADC_Keywords: Abundances ; Equivalent widths ; Keywords: stars: abundances; population II - Galaxy: abundances Description: A detailed analysis of neutral iron lines in a sample of 13 metal-poor dwarfs and subgiants is carried out on the basis of high resolution spectra obtained with the ESO Coude Echelle Spectrometer. The deduced iron abundance is found to depend on the excitation potential of the line used, higher excitation lines generally indicating higher abundances. This could be caused by departures from the local thermodynamic equilibrium (LTE) or by temperature inhomogeneities in the stellar atmospheres. The dependency of this effect on the stellar atmospheric parameters is investigated. From the comparison of iron lines with lines of other elements, it is concluded that the low excitation Fe I lines are much more affected than the high excitation lines. The consequences of these effects for the classical abundance analyses are examined. It is found that they may explain, at least in part, some previously reported discrepancies between the results of different authors. Objects: -------------------------------- RA (2000) DE Name -------------------------------- 00 38 31.8 -08 18 07 HD 3567 04 01 42.6 -57 12 45 HD 25704 14 01 03.9 -38 02 59 HD 122196 14 30 12.7 -62 51 41 HD 126793 14 59 51.6 -22 00 20 HD 132475 17 00 46.7 -64 33 01 HD 152924 17 42 49.5 -40 18 55 HD 160617 18 16 27.3 -59 24 04 HD 166913 20 01 01.2 -12 15 02 HD 189558 20 23 33.8 -21 21 22 HD 193901 20 26 11.4 +09 27 28 HD 194598 20 40 49.1 -18 47 13 HD 196892 20 58 07.7 -48 12 01 HD 199289 -------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4 178 36 Equivalent widths and abundances table4.tex 114 103 LaTeX version of table4
Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
1- 3 A3 --- Element Element 6- 12 F7.2 0.1nm Lambda Line wavelength 16- 19 F4.1 0.1pm EW3567 []? Equivalent width for the star HD 3567 21- 25 F5.3 --- Ab3567 []? Abundance for the star HD 3567 (1) 27- 30 F4.1 0.1pm EW25704 []? Equivalent width for the star HD 25704 32- 36 F5.3 --- Ab25704 []? Abundance for the star HD 25704 (1) 40- 43 F4.1 0.1pm EW122196 []? Equivalent width for the star HD 122196 45- 49 F5.3 --- Ab122196 []? Abundance for the star HD 122196 (1) 53- 56 F4.1 0.1pm EW126793 []? Equivalent width for the star HD 126793 58- 62 F5.3 --- Ab126793 []? Abundance for the star HD 126793 (1) 67- 70 F4.1 0.1pm EW132475 []? Equivalent width for the star HD 132475 72- 76 F5.3 --- Ab132475 []? Abundance for the star HD 132475 (1) 78- 81 F4.1 0.1pm EW152924 []? Equivalent width for the star HD 152924 83- 87 F5.3 --- Ab152924 []? Abundance for the star HD 152924 (1) 92- 95 F4.1 0.1pm EW160617 []? Equivalent width for the star HD 160617 97-101 F5.3 --- Ab160617 []? Abundance for the star HD 160617 (1) 106-109 F4.1 0.1pm EW166913 []? Equivalent width for the star HD 166913 111-115 F5.3 --- Ab166913 []? Abundance for the star HD 166913 (1) 117-120 F4.1 0.1pm EW189558 []? Equivalent width for the star HD 189558 122-126 F5.3 --- Ab189558 []? Abundance for the star HD 189558 (1) 130-133 F4.1 0.1pm EW193901 []? Equivalent width for the star HD 193901 135-139 F5.3 --- Ab193901 []? Abundance for the star HD 193901 (1) 143-146 F4.1 0.1pm EW194598 []? Equivalent width for the star HD 194598 148-152 F5.3 --- Ab194598 []? Abundance for the star HD 194598 (1) 157-160 F4.1 0.1pm EW196892 []? Equivalent width for the star HD 196892 162-166 F5.3 --- Ab196892 []? Abundance for the star HD 196892 (1) 168-171 F4.1 0.1pm EW199289 []? Equivalent width for the star HD 199289 173-177 F5.3 --- Ab199289 []? Abundance for the star HD 199289 (1)
Note (1): Abundance = log[Element/H]+12

(End) Simona Mei [CDS] 07-Jun-1995
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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