Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..639a&link_type=abstract
Astronomy and Astrophysics, v.399, p.639-645 (2003)
Astronomy and Astrophysics
Astrophysics
9
Stars: Binaries: Spectroscopic, Stars: Variables: Early-Type, Stars: Individual: En(16) Lac
Scientific paper
We perform for the first time spectroscopic mode identification in the eclipsing binary beta Cephei star EN (16) Lac. This mode identification is based upon a time series of 942 line profiles of the He I lambda lambda 6678 Åline in its spectrum. All three known frequencies f1, f,SUB>2,/SUB>, f3 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 l=2, m=0 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 l3<3. 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.
Based on observations gathered with the coudé spectrograph attached to the 2.0 m reflector telescope at Tautenburg Observatory.
Aerts Christine
Briquet Maryline
de Ridder Joris
Dupret Marc-Antoine
Lehmann Holger
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