Volume 542, June 2012
|Number of page(s)||6|
|Section||Stellar structure and evolution|
|Published online||05 June 2012|
Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon
I. V2028 Cygni⋆,⋆⋆
1 Faculty of Science, Masaryk University in Brno, Kotlářská 2, 611 37 Brno, Czech Republic
2 Astronomical Institute, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
3 Astronomical Institute of the Academy of Sciences of the Czech Republic, Fričova 298, 251 65 Ondřejov, Czech Republic
Received: 7 May 2011
Accepted: 27 March 2012
We present results of nearly six years of spectroscopic observations of the B[e] star V2028 Cyg. The presence of the cold-type absorption lines combined with a hot-type spectrum indicate the binarity of this object. Since B[e] stars are embedded in an extended envelope, the usage of common stellar atmosphere models for the analysis is quite inappropriate. Therefore, we focus on the analysis of the long-term spectral line variations in order to determine the nature of this object. We present the time dependences of the equivalent width and radial velocities of the Hα line, [O i] 6300 Å, Fe ii 6427, 6433, and 6456 Å lines. The bisector variations and line intensities are shown for the Hα line. The radial velocities are also measured for the absorption lines of the K component. No periodic variation is found. The observed data show correlations between the measured quantities, which can be used in future modelling.
Key words: line: profiles / binaries: general / circumstellar matter / stars: emission-line, Be / stars: individual
Reduced Ondrejov spectra are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A57
© ESO, 2012
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.