COMMUNICATIONS / MITTEILUNGEN
Quantitative Spektralanalyse des B2-Riesensterns Gamma Orionis
No. 44
Budapest, 1959
Abstract
The atmosphere of the B2 giant star, gamma Ori, has been investigated. It occupies
a place in the H-R diagram that lies close to the compact group of beta CMa stars (Fig 6),
but its radial velocity being constant the star does not belong to this group of variables.
Equivalent widths have been measured on 5 spectrograms (Table 1-2) taken by Kopilov
at the Crimean Astrophysical Observatory with a dispersion of 23,4 A/mm at H gamma.
Analysing the material by the curve-of-growth procedure the mean excitation temperature,
electron pressure, turbulence velocity, surface gravity and the relative proportions
of various light elements are determined. The results are tabulated in Table 7 and 9,
and compared to beta CMa stars in order to find out differences in the chemical
composition not depending on luminosity or spectral type (Table 10, Fig. 5 and 7). The results
indicate a higher H/He and H/O ratio for beta CMa stars than in the normal early-type B stars
like gamma Ori.
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