A possible mechanism for exciting pulsation in cool AP stars

Details A possible mechanism for exciting pulsation in cool AP stars A possible mechanism for exciting pulsation in cool AP stars

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235p...7m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 7P-11P. NSERC-supported research

Astronomy and Astrophysics

Astronomy

16

A Stars, Cool Stars, Magnetic Stars, Peculiar Stars, Stellar Oscillations, Abundance, Diffusion, Ionization, Radiation Pressure, Silicon, Stellar Atmospheres

Scientific paper

An envelope ionization mechanism involving Si IV is suggested as a possible source of pulsational driving in the rapidly oscillating Ap stars. It provides natural explanations for pulsational instability in a stellar atmosphere whose He II ionization zone has been depleted by diffusion, the observed location of the rapid oscillators in the H-R diagram, and the cause of the 'oblique pulsator' geometry proposed for these stars by Kurtz (1982).

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