Reference : The interpretation of the spectrum of HD 190073.
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
The interpretation of the spectrum of HD 190073.
Struve, Otto [> > > >]
Swings, Polydore [McDonald Observatory > > > > > >]
Astrophysical Journal
University of Chicago Press
[en] The hypothesis proposed by Beals for the interpretation of the complex contours of lines of H and Ca II in HD 190073 is discussed in the light of recent observations made at the McDonald Observatory. The absorption lines designated by Beals as A2 and A3 and the emission of Ca II and H probably originate in a shell whose radius is several times larger than the radius of the star. The absence of A1 near the center of the emission in Ca II H suggests that this sharp line is produced at a lower level, where the velocity of expansion is negligible. The central reversals of the H lines, on the other hand, may come from an upper layer of the shell where the atoms have become decelerated. In this case the absorbing layer must lie immediately above an optically thick emitting shell, so that it will act somewhat like a reversing layer and not like a detached shell at great distances from the emitting regions.
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