Some recent discoveries in roAp stars
| Autor: | D. W. Kurtz, J. D. Riley, Margarida S. Cunha, Eiji Kambe, V. G. Elkin, Gautier Mathys, Hiromoto Shibahashi |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Spiral galaxy K-type main-sequence star Flare star Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Herbig Ae/Be star Stars T Tauri star Space and Planetary Science Stellar mass loss Astrophysics::Solar and Stellar Astrophysics Astrophysics::Galaxy Astrophysics Exocomet |
| Zdroj: | Proceedings of the International Astronomical Union. 2004:343-352 |
| ISSN: | 1743-9221 1743-9213 |
| Popis: | Research in roAp stars is being vigorously pursued, both theoretically and observationally by many groups. We report the discovery of a 21-min period, luminous roAp star, HD 116114. Longer periods for more luminous stars have been predicted theoretically and this is the first discovery of such a star. We discuss a model for the blue-to-red line profile variability observed in some roAp stars involving a shock wave high in the atmosphere of roAp stars, yet show that the H line in 33 Lib has the blue-to-red-to-blue line profile variability expected for subsonic dipolar pulsation concentrated towards the pulsation pole. Further we report for 33 Lib unprecedented observations of the amplitudes and phases of its principal mode at 2.015 mHz and its first harmonic of that at 4.030 mHz.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html |
| Databáze: | OpenAIRE |
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