Issue |
A&A
Volume 399, Number 2, February IV 2003
|
|
---|---|---|
Page(s) | 639 - 645 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20021750 | |
Published online | 07 February 2003 |
Spectroscopic mode identification for the
Cephei star
EN (16) Lacertae*
1
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, conny@ster.kuleuven.ac.be
Received:
15
October
2002
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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