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J/AZh/82/601        Abundances of 4 red giants               (Antipova+, 2005)

Analysis of the Na, Mg, Al, and Si Abundances in the Atmospheres of Red Giants of Different Spectral Subgroups. Antipova L.I., Boyarchuk A.A., Pakhomov Yu.V., Yushkin M.V. <Astron. Zh. 82, 601 (2005)> =2005AZh....82..601A =2005ARep...49..535A
ADC_Keywords: Stars, giant; Stars, barium; Spectroscopy; Abundances Abstract: We analyze the Na, Mg, Al, and Si abundances in the atmospheres of more than 40 stars, including red giants of different spectral subgroups (normal red giants, mild and classical barium stars) and several supergiants. All these elements exhibit abundance excesses, with the overabundance increasing with the star's luminosity. The dependence of the overabundances for each of these elements on the luminosity (or logg) is the same for all the spectral subgroups, testifying to a common origin: they are all products of hydrogen burning in the NeNa and MgAl cycles that have been dredged up from the stellar interiors to the outer atmospheric layers by convection that gradually develops during the star's evolution from the main sequence to the red-giant stage. The sodium abundances derived for several stars are lower than for other stars with similar atmospheric parameters. The ages and kinematic characteristics of these two groups of stars suggest that they probably belong to different stellar generations. Objects: ----------------------------------------------------- RA (2000) DE Designation(s) (column) ----------------------------------------------------- 01 35 59.0 -15 24 01 HD 9856 = HR 459 (W1) 03 20 20.4 +29 02 54 HD 20644 = HR 999 (W2) 12 05 12.5 +08 43 59 HD 104979 = HR 4608 (W3) 19 18 50.9 +00 20 20 HD 181053 = HR 7321 (W4) ----------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 59 689 The equivalent widths
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- El Element 7- 13 F7.2 0.1nm Lambda Wavelength expressed in Angstroem 17- 20 F4.2 eV EP Excitation potentials of the lower level 23- 27 F5.2 [-] loggf Oscillator strength 31- 35 F5.3 0.1nm W1 ? Equivalent width of HD 9856 39- 43 F5.3 0.1nm W2 ? Equivalent width of HD 20644 47- 51 F5.3 0.1nm W3 ? Equivalent width of HD 104979 55- 59 F5.3 0.1nm W4 ? Equivalent width of HD 181053

(End) Yury Pakhomov, Veta Avedisova [INASAN] 30-May-2006
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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