Issue |
A&A
Volume 432, Number 3, March IV 2005
|
|
---|---|---|
Page(s) | 955 - 967 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20041444 | |
Published online | 07 March 2005 |
Disentangling component spectra of , a spectroscopic binary with a pulsating primary*
II. Interpretation of the line-profile variability
1
Institute of Astronomy, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium e-mail: Katrien.Uytterhoeven@ster.kuleuven.ac.be
2
Department of Astrophysics, University of Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands
3
Nordic Optical Telescope, Apartado de Correos 474, 38700 Santa Cruz de La Palma, Spain
4
Astronomical Institute of the Charles University, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
5
Astronomical Institute, Academy of Sciences, 251 65 Ondřejov, Czech Republic
6
Royal Observatory of Belgium, Ringlaan 3, 1180 Brussel, Belgium
Received:
10
June
2004
Accepted:
31
October
2004
We analyse the complex short-term line-profile variability of the
spectroscopic binary Cep star after orbit subtraction, before and
after spectral disentangling. We refine the known oscillation frequency of the
star:
c d-1 and detect
. Variability is also found at
frequencies near
c d-1 and
c d-1 or their
aliases. These frequencies are not significant if we consider the spectra alone,
but they survive our selection after the consideration that they were derived
previously from independent ground-based and space photometry by different
teams. Moreover, we find dominant variability in the equivalent width with a
frequency in the interval
c d-1 which we interpret as the
rotational frequency frot of the star. The complex window function does
not allow us to determine definite values for
. The
variability with f1 is interpreted as a prograde non-radial oscillation mode
with spherical wavenumbers
or
. The additional
frequencies are explained in terms of rotational modulation superposed to the
main oscillation. We also point out that we cannot disprove the variability in
to originate from co-rotating structures. KOREL disentangling preserves
the large-amplitude line-profile variability but its performance for complex
low-amplitude variability remains to be studied in detail.
Key words: binaries: spectroscopic / stars: oscillations / line: profiles / stars: individual:
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.