Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991azh....68..314b&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 68, Mar.-Apr. 1991, p. 314-322. In Russian.
Astronomy and Astrophysics
Astronomy
2
Cool Stars, Eclipsing Binary Stars, Hot Stars, Stellar Luminosity, Stellar Oscillations, Symbiotic Stars, Light Curve, M Stars, Red Giant Stars, Stellar Spectrophotometry
Scientific paper
Periods of 50.2 and 78.4 days were found in IRV light variations of the cool component of CI Cyg. One of them was observed in 1986-1987, and both were recorded simultaneously in 1988-1989. A period change typically occurring between 1600 and 3000 days is proposed. The possibility of nonradial oscillations (p-mode) in the upper layers of the red component of CI Cyg is argued. It is suggested that taking account of nonradial oscillations can obviate the requirement that the Roche lobe be filled with the cool component to ensure the requisite matter outflow speed. The luminosity of CI Cyg and curves based on differences of its luminosity are presented.
Belyakina T. S.
Prokofeva V. V.
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