Physics – Optics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........10k&link_type=abstract
Ph.D. Thesis Ludwig-Maximilians-Univ., Munich (Germany). Fakultaet für Physik.
Physics
Optics
B Stars, Early Stars, Helium, Interstellar Matter, Line Spectra, Stellar Composition, Stellar Evolution, Stellar Spectra, Stellar Spectrophotometry, Cassegrain Optics, Cepheus Constellation, Double Stars, Hertzsprung-Russell Diagram, Silicon, Spectrographs
Scientific paper
Chemical distributions are estimated in twenty-one main line B stars with high resolution echelle spectra in order to study star development and interstellar medium composition. Effective temperature, gravity acceleration, microturbulence, and absolute frequency were accurately calculated by using spectrum models which take into account possible dampings of the local thermodynamic equilibrium by line development. It is shown that microturbulence increases with star development advance and cannot be neglected in the calculations. Above average nitrogen distributions were discovered. This shows that mass can be transported from the Carbon Nitrogen Oxygen (CNO) cycle to the star center in the atmosphere.
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