Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon

0388462 - ASÚ 2013 RIV FR eng J - Článek v odborném periodiku
Polster, J. - Korčáková, D. - Votruba, Viktor - Škoda, Petr - Šlechta, Miroslav - Kučerová, B. - Kubát, Jiří
Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon.
Astronomy & Astrophysics. Roč. 542, June (2012), A57/1-A57/6. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR(CZ) GP205/09/P476; GA ČR GD205/08/H005
Výzkumný záměr: CEZ:AV0Z10030501
Klíčová slova: line profiles * circumstellar matter * Be stars
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 5.084, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0217359