Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...50..199d&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 50, Nov. 1982, p. 199-207. In French.
Astronomy and Astrophysics
Astrophysics
49
B Stars, Spectral Line Width, Stellar Spectra, A Stars, Abundance, H Lines, Stellar Models
Scientific paper
Previously published equivalent widths of 26 strong spectral lines measured at various reciprocal dispersions, ranging from 1 to 75 A/mm, in 172 B stars and 14 A stars are collected and analyzed. The lines considered include H-alpha and H-beta; six of He I and one of He II; one of C III; two of N II and one of N III; two of O II; one of Mg II; two each of Si II, Si III, and Si IV; one of Ca II; and three of Fe II. A comparison of the measurements made at the different reciprocal dispersions reveals that the equivalent width of a given line increases systematically with decreasing reciprocal dispersion. Only measurements made at a reciprocal dispersion of not more than 40 A/mm are used to plot average curves showing equivalent width as a function of spectral type and luminosity class for all 26 lines. In all but two cases (He I at 4121 A and Ca II at 4267 A), the behavior of the lines as a function of temperature and gravity is found to be in accordance with model-atmosphere theory.
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