Investigation of the shell stars omicron and theta Per, and of the eclipsing binary beta LYR

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Binary Stars, Shell Stars, Stellar Spectra, Computer Programs, Electromagnetic Absorption, Far Ultraviolet Radiation, Interstellar Matter, Oao 3, Photosphere, Stellar Envelopes, Ultraviolet Spectra

Scientific paper

All three stars showed rather complicated spectra, which require a very detailed spectroscopic analysis. The far UV spectrum of Beta Lyrae is clearly peculiar, with a multitude of emission lines not observed on any other star so far scanned with Copernicus. This made this star at once the most interesting and also, in a sense, easier to study. The other two stars display a spectrum rich in absorption lines, some of them being fairly broad (as expected for photospheric lines of rapidly rotating objects), some sharp. The later were clearly non-photospheric lines. An attempt was made to distinguish the circumstellar from the interstellar components.

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