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Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon; I. V2028 Cyg | | J. Polster
; D. Korcakova
; V. Votruba
; P. Skoda
; M. Slechta
; B. Kucerova
; J. Kubat
; | | Date: |
20 Aug 2012 | | Abstract: | 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. | | Source: | arXiv, 1208.4003 | | Services: | Forum | Review | PDF | Favorites | |
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