Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182l..25d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 1, Aug. 1987, p. L25-L28.
Astronomy and Astrophysics
Astrophysics
32
B Stars, Cassiopeia Constellation, Far Ultraviolet Radiation, Shell Stars, Variable Stars, Astronomical Spectroscopy, Balmer Series, Emission Spectra, Periodic Variations, Stellar Spectra
Scientific paper
A synthesis of the authors' long term observations of γ Cas in the visual and in the far UV, combined with IUE archived spectra, shows that: (1) The occurrence of the high velocity components observed in the Si IV, C IV, and N V resonance lines exhibits a long term variability pattern, which is associated with the cyclic V/R variations of the Balmer emission-lines: they are frequently observed when V/R > 1, while they are absent/rarely present when V/R < 1. (2) During the present V/R > 1 half-cycle, the observed components do not fit the column density vs. velocity correlation derived by Henrichs et al. (1983). γ Cas is one more example of a Be star which exhibits associated far UV and visual long term variability patterns.
Bourdonneau B.
Doazan Vera
Rusconi L.
Sedmak Giorgio
Thomas Nicholas R.
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