THE CHANGES OF SPECTRAL LINE CONTOURS OF P CYGNI
L. S. Luud, N. Markova · Proceedings of the Academy of Sciences of the Estonian SSR Physics Mathematics · 1983
P CYGNI '(Presented by /.Einasto) P Cygni is one of the most thoroughly investigated nonstable supergiant stars.Because of-its brightness, P Cygni is observable with high spectral resolution and in a large range of wavelengths.The main properties of P Cygni can be explained in the framework of three-zonal models of its envelope [ Unfortunately, majority of detailed spectroscopic investigations show an inexhaustible variety of small variations of spectral lines [ 4-B ].Some of these papers are based on the compa- rison of the contours obtained during a few nights, others on