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Akademie věd České republiky |
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Akademie věd České republiky |
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Pravidelný seminář 10. 1. 2005
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který se koná v pondělí dne v nové seminární místnosti AsÚ v Ondřejově PROGRAM: 13:00 odborná část V odborné části vyslechneme informace ze stelárního oddělení: 1. Novinky z oddělení (Pavel Koubský) Dr. Katrien Uytterhoeven An observational study of line-profile variable B stars in multiple systems
Our research is situated in framework of a systematic long-term project of line-profile variable B stars in close binary systems, with the aim to search for tidally induced oscillations. Major unsolved questions in the understanding of stars concern the role, if any, of binarity and rotation on stellar pulsation-mode selection and on the enhancement of pulsation-mode amplitudes. We also studied the line-profile variations of the confirmed beta Cephei stars kappa Scorpii and lambda Scorpii in detail in the broader context of a seismic study. As the interior of stars is not directly observable, accurate information is gathered from stellar oscillations which penetrate deep inside the star and whose behaviour is uniquely determined by the properties of the overall stellar structure. It is of utmost importance to identify with accuracy the pulsational frequencies and wavenumbers of the pulsation modes. High-resolution spectroscopy allows a detailed analysis of small line-profile changes. Techniques have been proposed to disentangle composite spectra, one of them being the KOREL code. It is unclear if the line-profile variability is preserved well after disentangling. We tested the performance of KOREL by means of the testcase kappa Scorpii. Srdečně zve Vladimír Karas vedoucí semináře |