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Spectrum of a^2 CVn. II

Cohen, Judith G. (1970) Spectrum of a^2 CVn. II. Astrophysical Journal, 159 . pp. 473-484. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20190529-103831934

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1086/150325DOIArticle
http://adsabs.harvard.edu/abs/1970ApJ...159..473CADSArticle
ORCID:
AuthorORCID
Cohen, Judith G.0000-0002-8039-4673
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.
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20190529-103831934
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190529-103831934
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ID Code:95853
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 May 2019 23:05
Last Modified:03 Oct 2019 21:17

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