New Delta-a-photometry of peculiar A-type stars - Evidence for a two-component-structure of the lambda 5200-feature

Astronomy and Astrophysics – Astrophysics

Scientific paper

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A Stars, Electrophotometry, Stellar Spectrophotometry, Optical Filters, Stellar Temperature, Transmissivity

Scientific paper

The paper presents photoelectric photometry of Ap and normal A-type stars in a filter system which resembles the system introduced by Maitzen (1976) in order to measure the strength of the 5200-A feature. It is found that the 5200-A depression cannot be due to a single opacity source but is composed of two main components with different temperature behavior: a broad, shallow feature and a narrow, rather deep one. The latter is centered on about 5175 A and shows its greatest strength at the hottest Ap stars; the former peaks at somewhat longer wavelengths and at a lower temperature.

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