Volume 399, Number 2, February IV 2003
|Page(s)||639 - 645|
|Section||Stellar structure and evolution|
|Published online||07 February 2003|
Spectroscopic mode identification for the Cephei star EN (16) Lacertae*
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium
2 Thüringer Landessternwarte, 07778 Tautenburg, Germany
3 Institut d'Astrophysique et de Géophysique de Liège, Université de Liège, allée du Six Août 17, 4000 Liège, Belgium
Corresponding author: C. Aerts, firstname.lastname@example.org
Accepted: 21 November 2002
We perform for the first time spectroscopic mode identification in the eclipsing binary Cephei star EN (16) Lac. This mode identification is based upon a time series of 942 line profiles of the He I 6678 Å line in its spectrum. All three known frequencies of the star are present in the line-profile variations, but we failed to find additional modes. Using different identification methods we find conclusive evidence for the radial nature of the main mode and for the identification of the mode with frequency f2. A unique identification of the third mode is not possible from the spectra, but we do derive that . Fits to the amplitude and phase variability of the modes imply a rotation frequency between 0.1 and 0.4 c d-1. The star's rotation axis is not aligned with the orbital axis.
Key words: stars: binaries: spectroscopic / stars: variables: early-type / stars: individual: EN(16) Lac
© ESO, 2003
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