E. Guggenberger
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View article: On the interpretation of the long-term cyclic period variations in RR Lyrae stars
On the interpretation of the long-term cyclic period variations in RR Lyrae stars Open
Many RR Lyrae stars show long-term variations of their pulsation period, some of them in a cyclic way. Such behaviour can be attributed to the light-travel time effect (LTTE) caused by an unseen companion. Solutions of the LTTE often sugge…
View article: A cautionary tale of interpreting O−C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companion
A cautionary tale of interpreting O−C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companion Open
We present a comprehensive study of Z CVn, an RR Lyrae star that shows\nlong-term cyclic variations of its pulsation period. A possible explanation\nsuggested from the shape of the O-C diagram is the light travel-time effect,\nwhich we tho…
View article: Stellar Parameters in an Instant with Machine Learning
Stellar Parameters in an Instant with Machine Learning Open
\nWith the advent of dedicated photometric space missions, the ability to rapidly process huge catalogues of stars has become paramount. Bellinger and Angelou et al. [1] recently introduced a new method based on machine learning for inferr…
View article: An RR Lyrae family portrait: 33 stars observed in Pisces with K2-E2
An RR Lyrae family portrait: 33 stars observed in Pisces with K2-E2 Open
A detailed analysis is presented of 33 RR Lyrae stars in Pisces observed with the Kepler space telescope over the 8.9-d long K2 Two-Wheel Concept Engineering Test. The sample includes not only fundamental-mode and first-overtone (RRab and …
View article: Kepler photometry of RRc stars: peculiar double-mode pulsations and period doubling
Kepler photometry of RRc stars: peculiar double-mode pulsations and period doubling Open
We present the analysis of four first overtone RR Lyrae stars observed with the Kepler space telescope, based on data obtained over nearly 2.5 yr. All four stars are found to be multiperiodic. The strongest secondary mode with frequency f2…