The long-term variations of Gamma CAS in the visual

Details The long-term variations of Gamma CAS in the visual The long-term variations of Gamma CAS in the visual

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..171d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 1, Nov. 1983, p. 171-180.

Astronomy and Astrophysics

Astrophysics

41

B Stars, Long Term Effects, Stellar Spectra, Variable Stars, Balmer Series, Emission Spectra, H Beta Line, Line Spectra, Shell Stars, Stellar Models

Scientific paper

Focusing on the last decade, over which Gamma Cas has been intensively observed in the far-UV and X-ray regions, an analysis is made of observational data from 72 high dispersion visual spectra obtained since 1972. It is found that, from 1972 to 1981, the emission of the Balmer lines decreases in 1973-1976 and increases up to its 1983 value in 1979-1981. The H-alpha and H-beta emission lines show the behavior of the V/R variables, and their emission line widths increase when the emission is stronger, decreasing when it is weaker. The characteristics of the long term variations of Gamma Cas in the visual range are compared with the basic assumptions of Be star and Gamma Cas models.

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