Classification of Ap-Stars HR 830 and 21 CVn

Details Classification of Ap-Stars HR 830 and 21 CVn Classification of Ap-Stars HR 830 and 21 CVn

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35..294z&link_type=abstract

Bulletin of the Astronomical Institute of Czechoslovakia, vol. 35, p.294

Astronomy and Astrophysics

Astronomy

3

Scientific paper

Two ambiguously classified Ap stars, HR 830 and 21 CVn, are studied. The observational data are compared with the data for normal stars α Del and α Lyr. The star HR 830 is classified as Ap of type Si based on the enhanced absorption in the Si lines and photometric variability in UBV. 21 CVn is classified as Ap Si based on weaker absorptions of helium, the variability of helium lines, photometric periodic variability and the properties of the UV spectrum. It is concluded that the photometric periodic variability is a good indicator of Ap-properties of rapidly rotating A and late B stars.

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