Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..219m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 219-233.
Astronomy and Astrophysics
Astrophysics
70
Binary Stars, Mira Variables, Stellar Activity, Symbiotic Stars, Astronomical Photometry, Cygnus Constellation, Light Curve, M Stars, Stellar Envelopes, Stellar Evolution, Stellar Spectra
Scientific paper
Results are reported from a study of the visual and blue light curves of CH Cyg for the period 1885-1988. The data and analysis results are presented in extensive tables, graphs, and sample spectra and characterized in detail. It is shown that a period of inactivity from 1885 to 1963 was followed by four outburst episodes of increasing magnitude and duration, with abrupt phase-transition-like changes from inactive to high-activity periods. These features are found to be consistent with the three-step accretion model of Mikolajewski and Mikolajewska (1988), in which a magnetic-white-dwarf active component is accreting mass from the stellar wind of an M giant companion. The physical mechanisms involved in the inactive, propeller, and accretor stages of this model are explored.
Khudiakova T. N.
Mikolajewska Joanna
Mikolajewski Maciej
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