Spectrum of a^2 CVn. II
The behavior of the continuum of a^2 CVn has been studied. The Balmer discontinuity does not vary but the slope of the Paschen continuum changes over the cycle. The line-blanketing coefficients have been measured at several phases and do not change sufficiently to produce the observed variations of the continuum. The effective temperature (12000° K) and surface gravity (log g = 4.0) are determined from the scans and hydrogen-line profiles, and the behavior of equivalent width as a function of phase is discussed. A crude abundance analysis is performed, which shows that the iron peak is enhanced above the solar value and that the rare earths are even more overabundant than was previously thought. The results of the abundance analysis are discussed in terms of a first-order oblique-rotator model, and the implications for the theory of Ap stars are described.
Additional Information© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1969 June 5; revised 1969 July 14. I thank the late Dr. Armin J. Deutsch for constant advice and encouragement. I thank Drs. Peter Conti, A.J. Deutsch, I.J. Danziger,J. L. Greenstein,J. B. Oke, and S. E. Strom for contributing observational material. Special thanks are due to Robert Kurucz and Dr. S. E. Strom for the use of their computer programs. I am indebted to Jon Okada for his help in the measurements, and to Mrs. Naomi Greenstein for improving the manuscript.
Published - 1970ApJ___159__473C.pdf