Tuesday, August 21, 2012

1208.4003 (J. Polster et al.)

Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon; I. V2028 Cyg    [PDF]

J. Polster, D. Korcakova, V. Votruba, P. Skoda, M. Slechta, B. Kucerova, J. Kubat
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 H alpha line, [O I] 6300 A, Fe II 6427, 6433, and 6456 A lines. The bisector variations and line intensities are shown for the H alpha 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.
View original: http://arxiv.org/abs/1208.4003

No comments:

Post a Comment