RR Lyrae
OGLE Cepheids and RR Lyrae stars in the Milky Way
... of RR Lyrae stars counts over 38000 objects in the Galactic bulge and over 45000 stars in the Mag- ellanic System (Magellanic Clouds and Magellanic Bridge, [6, ...
5
On the RR Lyrae Stars in Globulars. IV. ω Centauri Optical UBVRI Photometry
... New accurate and homogeneous optical UBVRI photometry has been obtained for variable stars in the Galactic globular cluster ω Cen ( NGC 5139 ) . We secured 8202 CCD images covering a time interval of 24 years and a sky ...
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SS cancri: The shortest modulation-period Blazhko RR Lyrae
... RR Lyrae stars play a crucial role in our understanding of astrophysics, providing both standard candles and tests for stellar evolution (Jurcsik et ...
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RR Lyrae mode switching in globular cluster M 68 (NGC 4590)
... We build on our detailed analysis of time-series observations of the globular cluster M 68 to investigate the irregular pulsational behaviour of four of the RR Lyrae stars in this cluster. M 68 is one of ...
6
Blazhko modulation in first-overtone RR Lyrae stars from the OGLE Collection
... RR Lyrae stars are classically pulsating ...double-mode RR Lyrae stars pulsating simultaneously in the radial fundamental mode and the first overtone (RRd type) or in the fundamental mode and ...
5
RR Lyrae star distance scale and kinematics from inner bulge to 50 kpc
... make RR Lyrae type variables excellent distance indicators and kinematic tracers, in particular, for the halo and the thick disk subsystems of our ...plus RR Lyraes in the extended solar neighborhood ...
5
METAL-RICH OR MISCLASSIFIED? THE CASE OF FOUR RR LYRAE STARS
... As a first step, we recalculated the photometric [Fe/H] incides of the stars, using equation (4) of Nemec et al. (2013) which is an adjusted version of the Morgan et al. (2007) relation, with the addition of four RRc ...
5
Gaia’s Cepheids and RR Lyrae stars and luminosity calibrations based on Tycho-Gaia Astrometric Solution
... spectroscopy, to calibrate the zero point of the period-luminosity and period-Wesenheit relations of classical and type II Cepheids, and the near-infrared period-luminosity, period-luminosity-metallicity and optical ...
5
CEPHEIDS AND RR LYRAE STARS IN THE K2 FIELDS
... About half of the fundamental-mode RR Lyrae stars turned out to be modulated. The analysis of the 4-year-long rectified data sets revealed that a very high fraction, about 80% shows multiple modulation ...
10
RR Lyrae stars and the Blazhko effect
... the RR Lyrae stars identified here will be a set of lightcurves with a very large number of magnitude observations over very long time spans and thus providing high frequency resolution, for example see ...
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Recent progress in the theoretical modelling of Cepheids and RR Lyrae stars
... To properly exploit the importance of pulsating stars as property tracers and standard candles of differ- ent stellar populations, accurate hydrodynamical models are needed. During the last few decades there has been an ...
8
FIRST RESULT OF THE CZECH RR LYRAE STARS OBSERVATION PROJECT
... To be able to get data of high quality, CRRLSOP focuses on bright RR Lyraes with V< 12 mag at maximum light. This value is chosen to suit the telescopes that amateurs use, which are typically of the diameter ...
6
COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS
... of RR Lyrae stars from the GEOS RR Lyr Survey (Le Borgne et ...of RR Lyr stars using the automatic telescopes TAROT ...GEOS RR Lyr web database ...
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Faint (and bright) variable stars in the satellites of the Milky Way
... star in Hydra II) are mainly located in the region of the Oo-intermediate and Oo II loci. If the Milky Way was formed by the accretion of small sub-structures as expected by the LCDM cosmology, the ultra-faint galaxies ...
5
Araucaria Project: Pulsating stars in binary systems and as distance indicators
... Abstract. Pulsating stars, like Cepheids or RR Lyrae stars, are ones of the most important distance indicators. They are also key objects for testing the predictions of stellar evolu- tion and stellar ...
8
Energetic properties of stellar pulsations across the Hertzsprung-Russell diagram
... Considering the self-excitation mechanism, one has to calculate the work integral, W , which mea- sures the net energy gathered by an oscillation mode during one cycle. This quantity tells us whether excitation can ...
6
A stellar census in globular clusters with MUSE: Binaries in NGC 3201
... – We manually set the binary probability in our sample to 0 for 10 RR Lyrae- and 5 SX Phoenicis-type stars known in the Catalogue of Variable Stars in Galactic Globular Clus- ters (Cleme[r] ...
23
Synergies between exoplanet surveys and variable star research
... on RR Lyrae stars in microlensing survey data [3]), current photometric projects, while looking for periodic transit signals, scan through the whole list of objects passing some minimum precision con- ...
13
Pulsating stars in the VMC survey
... magnitudes, for di ff erent types of stars, from at least 12 independent epochs. Within the next years we would like to use these data to go a step further into our understanding of the Magellanic Clouds and of specific ...
8
Accurate C-M diagrams of six southern globular clusters
... According to pulsation theory, the color of the blue edge of the instability strip is determined by its luminosity, helium abundance and the mass of the bluest RR Lyrae stars in the glob[r] ...
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