Tipsy pulsation of classical Cepheids – lessons from space photometry
1 Konkoly Observatory, Budapest, Hungary
2 SAO, Cambridge, USA
3 ELTE Gothard Astrophysical Observatory, Szombathely, Hungary
4 UBC, Vancouver, Canada
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Published online: 23 September 2015
Space photometric data of the Kepler Cepheid, V1154 Cygni, and those of SZ Tauri (MOST photometry) indicate that classical Cepheids are not strictly regular pulsators. Cycle-to-cycle period changes and variations in the shape of the light curve are revealed from the continuous photometry covering 6 cycles of SZ Tau pulsation and several hundred pulsation cycles of V1154 Cyg. To make the situation more interesting/complicated, the MOST light curve of RT Aurigae (a Cepheid pulsating in the fundamental mode) shows stellar oscillations in a highly repetitive manner.
© Owned by the authors, published by EDP Sciences, 2015
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