scholarly journals Galactic Fundamental Mode RR Lyrae Stars: Period-Amplitude Diagram, Metallicities and Distribution

2009 ◽  
Author(s):  
D. M. Szczygieł ◽  
G. Pojmański ◽  
B. Pilecki ◽  
Joyce Ann Guzik ◽  
Paul A. Bradley
Keyword(s):  
Fundamental Mode ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

scholarly journals The MACHO Project Large Magellanic Cloud Variable Star Inventory. XI. Frequency Analysis of the Fundamental‐Mode RR Lyrae Stars

2003 ◽  
Vol 598 (1) ◽  
pp. 597-609 ◽  
Author(s):  
C. Alcock ◽  
D. R. Alves ◽  
A. Becker ◽  
D. Bennett ◽  
K. H. Cook ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
Fundamental Mode ◽  
Variable Star ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

scholarly journals Are all RR Lyrae stars modulated?

2018 ◽  
Vol 614 ◽  
pp. L4 ◽  
Author(s):  
Geza Kovacs
Keyword(s):  
Fundamental Mode ◽  
Detection Efficiency ◽  
Large Magellanic Cloud ◽  
Light Curves ◽  
Occurrence Rate ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Efficiency Test ◽  
Lyrae Stars ◽  
True Occurrence

We analyzed 151 variables previously classified as fundamental mode RR Lyrae stars from Campaigns 01–04 of the Kepler two-wheel (K2) archive. By employing a method based on the application of systematics filtering with the aid of co-trending light curves in the presence of a large amplitude signal component, we searched for additional Fourier signals in the close neighborhood of the fundamental period. We found only 13 stars without such components, yielding the highest rate of modulated (Blazhko) stars detected so far (91 %). A detection efficiency test suggests that this occurrence rate likely implies a 100 % underlying rate. Furthermore, the same test performed on a subset of the Large Magellanic Cloud RR Lyrae stars from the MACHO archive shows that the conjecture of high true occurrence rate fits well to the low observed rate derived from this database.

scholarly journals Are RRab stars fully radial?

2013 ◽  
Vol 9 (S301) ◽  
pp. 383-384 ◽  
Author(s):  
József M. Benkő ◽  
Róbert Szabó
Keyword(s):  
Fundamental Mode ◽  
Period Doubling ◽  
Space Missions ◽  
Radial Pulsation ◽  
Linear Combinations ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Fourier Spectra ◽  
Oscillation Frequencies ◽  
Lyrae Stars

AbstractThanks to the space missions CoRoT and Kepler new oscillation frequencies have been discovered in the Fourier spectra of Blazhko RR Lyrae stars. The period doubling (PD) yields half-integer frequencies between the fundamental mode and its harmonics. In many cases the first and/or second radial overtone frequencies also appear temporally. Some stars show extra frequencies that were identified as potential non-radial modes. We show here that all these frequencies can be explained by pure radial pulsation as linear combinations of the frequencies of radial fundamental and overtone modes.

scholarly journals Kepler RR Lyrae stars: beyond period doubling

2013 ◽  
Vol 9 (S301) ◽  
pp. 459-460
Author(s):  
L. Molnár ◽  
J. M. Benkő ◽  
R. Szabó ◽  
Z. Kolláth
Keyword(s):  
Fundamental Mode ◽  
Period Doubling ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Blazhko Effect ◽  
Lyrae Stars

AbstractWe examined the complete short cadence sample of fundamental-mode Kepler RR Lyrae stars to further investigate the recently discovered dynamical effects such as period doubling and additional modes. Here we present the findings on four stars. V450 Lyr may be a non-classical double-mode RR Lyrae star pulsating in the fundamental mode and the second overtone. For the three remaining stars we observe the interaction of three different modes. Since the period ratios are close to resonant values, we observe quasi-repetitive patterns in the pulsation cycles in the stars. These findings support the mode-resonance explanations of the Blazhko effect.

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