Spectroscopic study of the supergiant star 6 Cassiopeiae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Line Spectra, Stellar Atmospheres, Stellar Spectra, Supergiant Stars, Astronomical Spectroscopy, Chromium, H Alpha Line, H Beta Line, Iron, Radial Velocity, Spectrograms, Titanium, Turbulence

Scientific paper

Twenty-five coude spectrograms (22 with dispersion 12 A/mm and three 7 A/mm) of 6 Cassiopeiae (A3 IA) have been studied. The observations were made at the Haute Provence Observatory. The results of the analysis suggest a correlation between the variations of the equivalent widths, the microturbulence and the radial velocity. The radial velocity and turbulent velocity present a rapid variation with time, even in intervals as short as about an hour. The hydrogen lines are slightly asymmetric but the strongest Fe II lines are clearly asymmetric. It is found that the amount of asymmetry of the strongest Fe II lines (I greater than 6) correlates with the log gf value, with the estimated laboratory intensity and with the equivalent width.

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