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R. Smolec - One of the best experts on this subject based on the ideXlab platform.
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double Mode Radial non Radial rr lyrae stars ogle iv photometry of two high cadence fields in the galactic bulge
Monthly Notices of the Royal Astronomical Society, 2015Co-Authors: H Netzel, R. Smolec, P MoskalikAbstract:We analyse the OGLE-IV photometry of the first overtone and double-Mode RR Lyrae stars (RRc/RRd) in the two fields towards the Galactic bulge observed with high cadence. In 27 per cent of RRc stars we find additional non-Radial Mode, with characteristic period ratio, P x /P 1O \in (0.6, 0.64). It strongly corroborates the conclusion arising from the analysis of space photometry of RRc stars, that this form of pulsation must be common. In the Petersen diagram the stars form three sequences. In 20 stars we find two or three close secondary Modes simultaneously. The additional Modes are clearly non-stationary. Their amplitude and/or phase vary in time. As a result, the patterns observed in the frequency spectra of these stars may be very complex. In some stars the additional Modes split into doublets, triplets or appear as a more complex bands of increased power. Subharmonics of additional Modes are detected in 20 per cent of stars. They also display a complex structure. Including our previous study of the OGLE-III Galactic bulge data, we have discovered 260 RRc and 2 RRd stars with the additional non-Radial Mode, which is the largest sample of these stars so far. The additional Mode is also detected in two Blazhko RRc stars, which shows that the modulation and additional non-Radial Mode are not exclusive.
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the complex case of v445 lyr observed with kepler two blazhko modulations a non Radial Mode possible triple Mode rr lyrae pulsation and more
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir SesarAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =−2.0 dex from spectroscopy, allowed us to constrain the mass (0.55–0.65 M_⊙) and luminosity (40–50 L_⊙) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O − C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.
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The complex case of V445 Lyr observed with Kepler: two Blazhko modulations, a non‐Radial Mode, possible triple Mode RR Lyrae pulsation, and more
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir Sesar, Róbert Szabó, Márcio CatelanAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =−2.0 dex from spectroscopy, allowed us to constrain the mass (0.55–0.65 M_⊙) and luminosity (40–50 L_⊙) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O − C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.
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the complex case of v445 lyr observed with kepler two blazhko modulations a non Radial Mode possible triple Mode rr lyrae pulsation and more
arXiv: Solar and Stellar Astrophysics, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir SesarAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as they have recently been detected in high precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused both by a secondary long-term modulation period as well as irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H]=-2.0 dex from spectroscopy, allowed to constrain the mass (0.55-0.65 M_sun) and luminosity (40-50 L_sun) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode as well as possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period doubling phenomenon and a long term period change. A detailed Fourier analysis along with a study of the O-C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high precision continuous satellite data has been published so far, the CoRoT star 105288363.
Seok Jin Yoon - One of the best experts on this subject based on the ideXlab platform.
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a novel tiny ultrasonic linear motor using the Radial Mode of a bimorph
Sensors and Actuators A-physical, 2006Co-Authors: Sangsig Kim, Sergjus N Borodinas, Piotr Vasiljev, Chongyun Kang, Seok Jin YoonAbstract:The new-typed tiny ultrasonic motor has been introduced to have compact and simple structure. The linear motion of a new-type linear motor is operated by a principle of inertia displacement. The motor can be realized by the central movement of transducing part, which is the maximum displacement of the up-and-down movement. The transducing parts, using different diameters, 3.0 and 5.0 mm and thickness of 0.1 and 0.2 mm metal disks, were fabricated and the dynamic characteristics of the motors were measured. The motor with piezoelectric ceramic of O3 needs higher operating voltage than the motor with the piezoelectric ceramic of O5.
Sergjus N Borodinas - One of the best experts on this subject based on the ideXlab platform.
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a novel tiny ultrasonic linear motor using the Radial Mode of a bimorph
Sensors and Actuators A-physical, 2006Co-Authors: Sangsig Kim, Sergjus N Borodinas, Piotr Vasiljev, Chongyun Kang, Seok Jin YoonAbstract:The new-typed tiny ultrasonic motor has been introduced to have compact and simple structure. The linear motion of a new-type linear motor is operated by a principle of inertia displacement. The motor can be realized by the central movement of transducing part, which is the maximum displacement of the up-and-down movement. The transducing parts, using different diameters, 3.0 and 5.0 mm and thickness of 0.1 and 0.2 mm metal disks, were fabricated and the dynamic characteristics of the motors were measured. The motor with piezoelectric ceramic of O3 needs higher operating voltage than the motor with the piezoelectric ceramic of O5.
Branimir Sesar - One of the best experts on this subject based on the ideXlab platform.
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the complex case of v445 lyr observed with kepler two blazhko modulations a non Radial Mode possible triple Mode rr lyrae pulsation and more
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir SesarAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =−2.0 dex from spectroscopy, allowed us to constrain the mass (0.55–0.65 M_⊙) and luminosity (40–50 L_⊙) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O − C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.
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The complex case of V445 Lyr observed with Kepler: two Blazhko modulations, a non‐Radial Mode, possible triple Mode RR Lyrae pulsation, and more
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir Sesar, Róbert Szabó, Márcio CatelanAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =−2.0 dex from spectroscopy, allowed us to constrain the mass (0.55–0.65 M_⊙) and luminosity (40–50 L_⊙) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O − C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.
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the complex case of v445 lyr observed with kepler two blazhko modulations a non Radial Mode possible triple Mode rr lyrae pulsation and more
arXiv: Solar and Stellar Astrophysics, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir SesarAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as they have recently been detected in high precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused both by a secondary long-term modulation period as well as irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H]=-2.0 dex from spectroscopy, allowed to constrain the mass (0.55-0.65 M_sun) and luminosity (40-50 L_sun) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode as well as possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period doubling phenomenon and a long term period change. A detailed Fourier analysis along with a study of the O-C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high precision continuous satellite data has been published so far, the CoRoT star 105288363.
Katrien Kolenberg - One of the best experts on this subject based on the ideXlab platform.
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the complex case of v445 lyr observed with kepler two blazhko modulations a non Radial Mode possible triple Mode rr lyrae pulsation and more
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir SesarAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =−2.0 dex from spectroscopy, allowed us to constrain the mass (0.55–0.65 M_⊙) and luminosity (40–50 L_⊙) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O − C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.
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The complex case of V445 Lyr observed with Kepler: two Blazhko modulations, a non‐Radial Mode, possible triple Mode RR Lyrae pulsation, and more
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir Sesar, Róbert Szabó, Márcio CatelanAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =−2.0 dex from spectroscopy, allowed us to constrain the mass (0.55–0.65 M_⊙) and luminosity (40–50 L_⊙) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O − C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.
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the complex case of v445 lyr observed with kepler two blazhko modulations a non Radial Mode possible triple Mode rr lyrae pulsation and more
arXiv: Solar and Stellar Astrophysics, 2012Co-Authors: E. Guggenberger, Katrien Kolenberg, James M. Nemec, R. Smolec, J. M. Benkő, Chow-choong Ngeow, Judith G. Cohen, Branimir SesarAbstract:Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as they have recently been detected in high precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused both by a secondary long-term modulation period as well as irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second Radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H]=-2.0 dex from spectroscopy, allowed to constrain the mass (0.55-0.65 M_sun) and luminosity (40-50 L_sun) of V445 Lyr through theoretical Petersen diagrams. A non-Radial Mode as well as possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period doubling phenomenon and a long term period change. A detailed Fourier analysis along with a study of the O-C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high precision continuous satellite data has been published so far, the CoRoT star 105288363.
