Results 221 to 230 of about 2,111 (247)
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Stellar Pulsations and Stability
2002Being a dynamical system, the star has diverse oscillatory eigenmodes. When one takes thermal processes into account, some of these appear to be unstable. The increment of such an instability γ, equal to the inverse time scale of the amplitude increase by a factor of e, is usually well below the pulsational frequency ω.
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Relativistic Stellar Pulsations
1987This thesis consists of studies on the topic of relativistic stellar pulsations. i) A new formalism for the numerical study of g-modes in neutron stars is developed. This formalism avoids pitfalls associated with previous formalisms when applied to the study of these low-frequency modes.
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Challenges In Stellar Pulsation
2010Ever since some stars were found to pulsate in the early 20th century, stellar pulsation has been a major topic in astronomy and astrophysics. The huge amount of data recently available from observational surveys, new discoveries from space missions and studies of pulsating stars in low-metallicity environments have opened new perspectives and ...
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Physical mechanisms in stellar pulsations
The Journal of the Acoustical Society of America, 1985Stars evolve from their births to their deaths by converting their store of hydrogen to helium, and then much of this helium is fused to heavier elements such as carbon, oxygen, and up to iron. During this evolution, the stellar mass may decrease by a stellar wind mass loss, the radius usually greatly increases, and the radiation luminosity emitted at ...
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Stellar Pulsations and Stellar Evolution: Conflict, Cohabitation, or Symbiosis?
2012While the analysis of stellar pulsations allows the determination of current properties of a star, stellar evolution models connect it with its previous history. In many cases results from both methods do not agree. In this review some classical and current cases of disagreement are presented.
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Stellar Pulsation — Nonlinear Studies
2001List of Figures. List of Tables. Preface. Contributing Authors. 1. A Historical Sketch of the Beat Cepheid Studies J.O. Petersen, M. Takeuti. 2. Double-Mode Stellar Pulsations Z. Kollath, J.R. Buchler. 3. The Multiperiodic Behavior of RR Lyrae Stars G. Kovacs. 4. RV Tauri Stars A.B. Fokin. 5. Pulsation and Mass Loss E.A. Dorfi, et al. 6.
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Nonradial and Nonlinear Stellar Pulsation
1980Observational evidence of radial mode resonances and of nonspherical symmetry in some variable stars of ? Scuti and related types.- ? Scuti variables: The link between giant- and dwarf-type pulsators.- Nonlinear calculations for bump Cepheids.- A nonlinear study of AI Velorum.- Nonlinear ?
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Excitation of Stellar Pulsations
2012In this review I present an overview of our current understanding of thephysical mechanisms that are responsible for the excitation of pulsations in stars withsurface convection zones. These are typically cooler stars such as the Delta Scuti stars,and stars supporting solar-like oscillations.
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