H and K Ca II lines in the spectrum of R CrB during the initial phase of the 1985 visual minimum.

Details H and K Ca II lines in the spectrum of R CrB during the initial phase of the 1985 visual minimum. H and K Ca II lines in the spectrum of R CrB during the initial phase of the 1985 visual minimum.

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998kfnt...14...35b&link_type=abstract

Kinematika Fiz. Nebesn. Tel, Tom 14, No. 1, p. 35 - 47

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R Crb Stars: Calcium Lines

Scientific paper

The authors present results of spectral observations of R CrB during the initial phase of a rather shallow and simple visual light minimum in 1985. The dispersion of spectrograms (4.4 and 16.7 nm/mm) allowed them to trace a development of the H and K Ca II lines: the disappearance of absorption lines and the appearance of narrow emissions comparable with other narrow emission lines (Ti II, Sr II, Sc II, Y II, etc). An attempt is made to interpret the disappearance of absorption lines and the behaviour of H and K line profiles during a light minimum as a consequence of smoothing the temperature minimum and heating the chromosphere and photosphere. The modelling has also shown that the chromospheric density increases by 1 - 2 orders of magnitude.

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