Carbon, nitrogen, and oxygen abundances in loose association and field B-type stars

Details Carbon, nitrogen, and oxygen abundances in loose association and field B-type stars Carbon, nitrogen, and oxygen abundances in loose association and field B-type stars

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..115k&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 115-122. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

58

Abundance, B Stars, Carbon, Line Spectra, Nitrogen, Oxygen, Spectrum Analysis, Stellar Spectra, Stellar Structure

Scientific paper

Equivalent widths are presented for lines of C II, N II, and O II in the spectra of early-type stars both in the general field and in the associations Sco-Cen, Orion OB 1 and Lac OB 1. The observations were taken at high resolution (approximately 0.2 Å) with a custom built, high dispersion (approximately 0.75 Å mm-1) echelle spectrograph and should be of good quality. They have been analysed by means of LTE model atmospheres to yield CNO abundances relative to hydrogen, with differences between associations being accurate to approximately 0.1 dex. There is no evidence for differences in the nitrogen and oxygen abundances between the associations or with the field stars and if such differences exist they are less than 0.2 dex. The mean values for these two elements are also in excellent agreement with the solar values. Five stars are identified as being possibly carbon rich but excluding these, there is again no evidence for any significant variations in carbon abundances. The mean carbon abundance from the early-type stars is lower than the solar value, possibly due to an error in the oscillator strength for the C II 4267 Å line.

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