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Astron. Astrophys. 360, 642-646 (2000)

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Magnetic field variations with pulsational phase in the classical Cepheid star [FORMULA] Aquilae

S.I. Plachinda

Crimean Astrophysical Observatory, and Isaac Newton Institute of Chile, Crimean Branch, p/o Nauchny, Crimea, 98409, Ukraine (plach@crao.crimea.ua)

Received 23 March 2000 / Accepted 18 May 2000

Abstract

The presence of the magnetic field on the classical Cepheid [FORMULA] Aquilae is established. The magnetic field shows periodic variations with a reversal of its polarity due to stellar pulsations ([FORMULA] G). Two closed values of [FORMULA] lie out of the magnetic curve at phases [FORMULA] and [FORMULA]. It was suggested that these recoiled points show that the abrupt change of the magnetic field occurred at the phase of propagation of the shock wave within the stellar atmosphere.

Key words: shock waves – stars: individual: j Aquilae – stars: magnetic fields – stars: oscillations – stars: variables: Cepheids

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© European Southern Observatory (ESO) 2000

Online publication: August 17, 2000
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