Observation of possible mode switching in three semiregular variable stars
| Autor: | Lee Anne Willson, Christopher Sneden, Janet A. Mattei, R. R. Cadmus |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Physics
Overtone Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Light curve Astronomical spectroscopy Photometry (optics) Stars Amplitude Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Variable star Astrophysics::Galaxy Astrophysics Stellar pulsation |
| Zdroj: | The Astronomical Journal. 101:1043 |
| ISSN: | 0004-6256 |
| DOI: | 10.1086/115746 |
| Popis: | Both the amplitude and period of the light variations of the semiregular long-period variables RV And, S Aql, and U Boo dramaticaly decreased, and then suddenly increased, in recent years. These observations, in conjunction with spectroscopic data, suggest that these stars may have switched from fundamental to overtone pulsation and back again. Theoretical models are consistent with both the photometric and spectroscopic observations. The similarity between the longer-period oscillations of these stars and the behavior of Mira variables supports the conclusion that the Miras are fundamental-mode pulsators. 14 refs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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