Department of Physics and Astronomy: Publications and Other Research
Date of this Version
8-15-1989
Abstract
We have carried out high-resolution, long-wavelength IUE observations and ground-based photometry of the δ Scuti star β Cas. The ground-based observations were used together with previous results of Antonello et al. to ensure that the IUE observations were correctly phased relative to the photometric variation. Fluxes for the emission core of the Mg II k λ2796 line were obtained from the ultraviolet spectra over several cycles in 1986 and 1987. We found that there is an increase in the emission during part of the cycle but it occurs near minimum light in contrast to another δ Scuti star, ρ Pup, and the classical Cepheids where it occurs near maximum light. The mean level of chromospheric activity is comparable to other early F dwarfs.
Comments
Published in The Astrophysical Journal 343, 916 (1988). Published by the University of Chicago Press; copyright © 1989 American Astronomical Society; reproduced by permission of the AAS. http://www.journals.uchicago.edu/ApJ/front.html