Two peculiar galactic supergiants have been monitored in photometry and radial velocity during more than 15 years, using the telescopes of Geneva Observatory at La Silla (ESO, Chile) and Haute-Provence Observatory (France). These two supergiants are found to be the classical cepheids with the longest (V810 Cen) and shortest (V473 Lyr) periods in our Galaxy, i.e. 153 d and 1.5d. In addition, V810 Cen is a double-mode cepheid with a period ratio of 0.68, strongly suggesting pulsation in the fundamental mode and first overtone, and V473 Lyr exhibits large variations of amplitude in a time-scale larger than 1000 d. The understanding of the complex variability of these two stars requires long-term-, continuous- and high-precision monitoring.
CITATION STYLE
Burki, G. (1994). Long-Term Monitoring of the Extreme Galactic Cepheids V810 Centauri and V473 Lyrae. In The Impact of Long-Term Monitoring on Variable Star Research (pp. 247–254). Springer Netherlands. https://doi.org/10.1007/978-94-011-1164-5_20
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