Some regularities in the variation of the Balmer line profiles in the P CYG spectrum

Details Some regularities in the variation of the Balmer line profiles in the P CYG spectrum Some regularities in the variation of the Balmer line profiles in the P CYG spectrum

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.123....5m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 123, no. 1, June 1986, p. 5-19.

Astronomy and Astrophysics

Astrophysics

16

Balmer Series, Peculiar Stars, Radio Spectra, Spectral Line Width, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, Emission Spectra, Hydrogen, Spectral Energy Distribution, Spectral Resolution, Stellar Envelopes, Stellar Mass Ejection

Scientific paper

Using the Coude focus of the 2 m RCC telescope at the National Astronomical Observatory of the Bulgarian Academy of Science, 47 spectrograms covering the range from 3500 to 4900 A (about 1400 A) with a reciprocal dispersion of 9 a/mm and a spectral resolution of 0.18 A were obtained. The photometric and position behavior of Balmer lines were investigated over a long time-scale, i.e., March 1981 to August 1982. The hydrogen line profiles were rectified in the way described by de Grot (1969). It is found that the absorption consists of three and sometimes four components. Their position behavior may be explained by the existence of two kinds of shells, pulsating and steadily expanding, and it is quite possible that shells of the first type may become shells of the second type in the outer parts of the P Cyg envelope. The total emission and absorption equivalent widths of the H11, H9, and H-delta lines change with conspicuous minima and maxima. The amplitude of these variations increases with decrease in the upper quantum number. For example, the total absorption equivalent widths change by about 38 percent for H-delta and 22 percent for H9. The data suggest a periodic change in the radial velocities, intensity of each separate absorption component, total equivalent widths and profiles.

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