SUBDWARFS: ABUNDANCE OF LIGHT ELEMENTS

Автор(и)

  • T. V. Mishenina Astronomical Observatory, Odessa State University, Україна
  • V. G. Klochkova Special Astrophysical Observatory, Russian Academy of Sciences, Російська Федерація
  • V. E. Panchuk Special Astrophysical Observatory, Russian Academy of Sciences, Російська Федерація

DOI:

https://doi.org/10.18524/1810-4215.1996.9.109489

Ключові слова:

stars, abundances, atmospheres, evolution

Анотація

CNO abundances in the atmospheres of seven metal-deficient stars were derived by model atmosphere method on the basis of high dispersion Echelle spectra obtained using the 6-m telescope of the Special Observatory of the Russian Academy of Sciences. The O abundances are derived from lines of lR-triplet Ol 7773 Å. The C2(0,1) bandhead of the Svaan A3IIg – X3llg system, at 5635.5 Å is used to derive the C abundances. To derive the nitrogen abundances, the CN red system A2ll-X2Σ was used. the CN(5,1) 6332.18 Å and 6478.48 Å were considered. The obtained [O/Fe] values confirm the trend of [O/Fe] vs [Fe/H]. For stars of our sample with [Fe/H] > -1.00 we found that nitrogen is overabundant relative to iron; carbon - underabundant.

Посилання

Barbuy B: 1983, A & A, 123, 1.

Bell R.A. et aL: 1976, A & AS, 23, 37

Carney B.W. et aL: 1994, AJ, 107, 2240

Galazutdinov G.A.: 1992, Preprint Spec. Astrophys. Obs., 92

King J.R., Boesgaard A.M.: 1995, AJ, 109, 383

Klochkova V.G. et aL: 1995, Bull. Spec. Astrophys. Obs., 39, 5

Kurucz R.L.: 1979, ApJS, 40, 1

Kurucz R.L.: 1993, Computation of opacities for diatomic molecules. -in ”Molecules in the stellar environment” IAU Coll., Copenhagen, Springer-Verlag N100, 282

Laird J.B. et ELL: 1988, AJ, 95, 1843

Matteucci F., Francois P: 1992, A & A, 262, L1

Panchuk V.E. et aL: 1993, Pis’ma Astron. Zh., 19,1069

Sneden C. et aL: 1979, ApJ, 234, 964

Shavrina A.V., Kuznetsova L.A.: 1996 (in press)

Tsymbal V. V.: 1994, Odessa Astron, Publ. 7, 146.

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2017-09-04

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