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
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 (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A57
© ESO, 2012
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