Results 221 to 230 of about 481 (259)

Theoretical Stellar Pulsation Physics

Proceedings of the International Astronomical Union, 2022
AbstractPulsating stars play a crucial role in the calibration of the cosmic distance scale as well as in tracing the properties of the associated stellar populations. In the era of large observational surveys and precise astrometric missions, it is crucial to rely on accurate stellar pulsation models able to predict the observed behaviors for ...
M. Marconi, G. De Somma, R. Molinaro, I. Musella   +3 more
openaire   +1 more source

The development of the theory of stellar pulsations

New Astronomy Reviews, 1997
Abstract A short account is presented of the struggle to understand and provide a theory for stellar pulsations. The observational and theoretical developments from the discovery of δ Cephei in 1784 up to Baker and Kippenhahn's key paper of 1962 are described and their significance discussed.
Alfred Gautschy
exaly   +2 more sources

Relativistic Stellar Pulsations

1987
This 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.
openaire   +1 more source

Stellar Pulsations and Stability

2002
Being 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.
openaire   +1 more source

On the Observed Complexity of Chaotic Stellar Pulsation

International Astronomical Union Colloquium, 1993
The existence of some variable stars producing very complicated light curves is well known. Theoretical calculations suggest that the irregular behaviour of the pulsation models in the RV Tauri and W Virginis regime is low dimensional is the result of period-doubling or tangent bifurcations (see e.g.
openaire   +1 more source

Challenges In Stellar Pulsation

2010
Ever 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 ...
openaire   +1 more source

Stellar Pulsations and Stellar Evolution: Conflict, Cohabitation, or Symbiosis?

2012
While 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.
openaire   +2 more sources

Stellar Pulsation — Nonlinear Studies

2001
List 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.
openaire   +1 more source

Nonradial and Nonlinear Stellar Pulsation

1980
Observational 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 ?
openaire   +1 more source

Inversion method in stellar pulsation

AIP Conference Proceedings, 2007
This is a presentation of the asteroseismological method (ROMOSC) implemented in the Bucharest Observatory to be used in the CoRoT mission. We will also present a calibration of this method with the similar one implemented in the MOST mission in the case of the star η Boo.
openaire   +1 more source