Variability of Balmer lines in AP stars

Details Variability of Balmer lines in AP stars Variability of Balmer lines in AP stars

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202..143m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. 143-152. Research supported by the Polska Akademia

Astronomy and Astrophysics

Astrophysics

22

A Stars, Balmer Series, Magnetic Stars, Peculiar Stars, Stellar Spectra, Variable Stars, Abundance, Electromagnetic Fields, H Beta Line, Metallic Stars

Scientific paper

A set of beta index measurements were obtained for 22 Ap stars between 1984 and 1986. Periodic variability of the beta index with the rotational phase is found for 17 of the stars, and the upper limits of variations are determined for the remaining five stars. A model of horizontal and vertical chemical inhomogeneity caused by the diffusion of elements is shown to qualitatively account for the similarity and observed phase relations between photometric and Balmer line variations, along with the observed mean amplitudes of the beta variations, for most of the Ap stars considered.

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