LTE and non-LTE abundance analyses of nitrogen deficient supergiants in a loose association

Details LTE and non-LTE abundance analyses of nitrogen deficient supergiants in a loose association LTE and non-LTE abundance analyses of nitrogen deficient supergiants in a loose association

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..203d&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 203-215.

Astronomy and Astrophysics

Astrophysics

27

Abundance, B Stars, Nitrogen, Stellar Atmospheres, Supergiant Stars, Thermodynamic Equilibrium, Atmospheric Models, Helium, Hydrogen, Interstellar Matter, Line Spectra, Spectrum Analysis, Stellar Models, Stellar Spectra

Scientific paper

Models of stellar atmospheres in local thermodynamic equilibrium (LTE) and nonequilibrium are used in the abundance analysis of the supergiant B stars HD 96159 and HD 96261, members of a loose association. Spectral line widths were measured in the range 3500 to 4800 A and compared with spectra of the normal supergiant B star theta Ara. Observed equivalent line widths and line profiles were compared with those predicted by LTE atmospheric model calculations. Abundances of H, He, C, N, O and Si are presented and the low nitrogen abundance found is confirmed by use of nonequilibrium atmospheric models, and determined to be 0.8 + or - 0.3 dex with respect to standard early stars. Since it is indicated that the association stars and the normal star are all at the early stage of hydrogen core burning, it is concluded that the nitrogen deficiency is due to the inhomogeneity of the primordial interstellar medium.

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