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| Paper: |
EM Cep: The Be Star |
| Volume: |
511, Non-Stable Universe: Energetic Resources, Activity Phenomena and Evolutionary Processes |
| Page: |
90 |
| Authors: |
Kochiashvili, N.; Kochiashvili, I.; Natsvlishvili, R.; Vardosanidze, M.; Beradze, S. |
| Abstract: |
On the basis of UBVR photometric data, obtained in the Abastumani Observatory during 1991-1999, very
interesting and unusual flare of EM Cep has been revealed. Duration of the flare was over two hours. We
estimated the percentage of brightness increase during the flare and brightness decrease of the
corresponding anti-flare and the minimum amount of the lost mass during this event.
We have solved the light curves of the star using the Wilson-Devinney code. But the resulting fraction of
calculated brightness of the companion star was not in accordance with spectral data. Then we decided
to check the idea of a pulsating single star using new spectral data. Together with our Buyrakan
colleagues we obtained and analyzed spectra of the star. We could not find spectral lines of a companion
star or any traces of the radial velocities using this data. Hence, we concluded that we need the
higher resolution spectra for final resolution of the matter.
On the basis of the latest spectral data of Bulgarian astronomers they concluded that EM Cep is a single
star. This makes it possible to suggest, that the question of stellar pulsation could be solved using
additional photometric observations. |
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