Spectral observations of CH Cygni. IV - June 1983 to May 1984, the period prior to the end of the active phase

Details Spectral observations of CH Cygni. IV - June 1983 to May 1984, the period prior to the end of the active phase Spectral observations of CH Cygni. IV - June 1983 to May 1984, the period prior to the end of the active phase

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991kfnt....7...72r&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 7, May-June 1991, p. 72-76. In Russian.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Cygnus Constellation, Stellar Envelopes, Stellar Luminosity, Stellar Spectra, Absorption Spectra, Ionization Potentials, Spectral Line Width, Strontium

Scientific paper

Spectral observations of Cygni IV from June 1983 to May 1984 indicated that the changes that occurred in its spectrum during this period preceded the end of the activity phase that set in with a sudden drop of the star's brightness in July 1984. The intensity of the blue continuum reached its highest value in the middle of 1983 and then began to decrease rapidly. The absorption lines of the ions with high ionization potentials weakened, while the lines of Sr II, which has a lower ionization potential, grew stronger, indicating a decrease of the ionization temperature in the envelope.

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