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Spectropolarimetric study of the classical Cepheid η Aql: pulsation and magnetic field

Published online by Cambridge University Press:  18 February 2014

V. Butkovskaya ,
S. Plachinda ,
D. Baklanova  and
V. Butkovskyi
V. Butkovskaya
Affiliation:
Crimean Astrophysical Observatory of Taras Shevchenko National University of Kyiv, 98409, Nauchny, Crimea, Ukraine, email: varya@crao.crimea.ua
S. Plachinda
Affiliation:
Crimean Astrophysical Observatory of Taras Shevchenko National University of Kyiv, 98409, Nauchny, Crimea, Ukraine, email: varya@crao.crimea.ua
D. Baklanova
Affiliation:
Crimean Astrophysical Observatory of Taras Shevchenko National University of Kyiv, 98409, Nauchny, Crimea, Ukraine, email: varya@crao.crimea.ua
V. Butkovskyi
Affiliation:
Taurida National V. I. Vernadsky University, 95007, Vernadskogo str. 4, Simferopol, Crimea, Ukraine
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Abstract

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We report the results of spectropolarimetric study of the classical Cepheid η Aql. We found that the longitudinal magnetic field of η Aql sinusoidally varies with the radial pulsation period, while the amplitude B, mean field B0, and phases of maximum and minimum field change from year to year. We hypothesize that possible reasons of those variations are stellar axial rotation or dynamo mechanisms.

Keywords

stars: magnetic fieldsstars: oscillationsstars: individual: η Aql
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 393 - 394
Copyright
Copyright © International Astronomical Union 2014 

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