2Dept. of Optics and Quantumelectronics, University of Szeged
Dóm tér 9, H-6720 Szeged, Hungary
e-mail: l.kiss, k.szatmary, vinko@physx.u-szeged.hu
Abstract:
The bright supergiant and suspected binary star 89 Herculis is studied with help of
infrared and
optical spectroscopy. The high-resolution sodium D profiles suggest multiple
velocity structure of circumstellar clouds. Astrophysical parameters are derived by
fitting model spectra in the infrared region.
Our results are in agreement with the recently emerged view of the system based on
radio and infrared observations. We also discuss photometric and radial velocity
variations concluding that pulsations are barely detectable in velocity data.
This behaviour is likely to be caused by the spectral line profile distorsions
due to circumstellar envelope.
