Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nyasa.773....1b&link_type=abstract
Waves in Astrophysics, vol. Volume 773, p. 1-13
Astronomy and Astrophysics
Astrophysics
3
Variable Stars, Chaos, Nonlinear Systems, Stellar Luminosity, Light Curve, Nonlinear Equations, Stellar Radiation, Noise Spectra, Radio Signals, Standing Waves, Wave Interaction
Scientific paper
Observations and theory have shown that in the classical variable stars, such as the Cepheids and RR Lyrae stars, the pulsations are often periodic to good accuracy, or when they are multiperiodic they involve just a couple of frequencies, and thus of standing waves. In contrast, the pulsations of many of their more luminous and metal poor, Population 2 (Pop. 2) cousins are irregular for pulsation 'periods' in excess of 15 days. It is only in the last decade that a systematical numerical hydrodynamical survey of W Virginis models has shown that the pulsations of these Pop. 2 objects are in fact chaotic in the dynamical systems sense of the word. The dominant clue as to the chaotic nature of these pulsations comes from the fact that, as a control parameter, namely the equilibrium effective temperature of the models is varied, the pulsations display a period-doubling cascade that is a clear signature of a chaotic dynamics. However, an analysis of observational data to corroborate the chaotic nature of these pulsations has been sorely missing. Fortunately such analyses have recently become possible. First, suitable observational data sets are now available, and, second, new methods of nonlinear time-series analysis have been developed that can be adapted to astronomical data. In this paper we review these recent developments and the results that have been obtained.
Buchler Jean-Robert
Kolláth Zoltan
Serre Thierry
No associations
LandOfFree
Chaos in Observational Variable Star Data: Irregularity from the Nonlinear Interaction of Standing Waves? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chaos in Observational Variable Star Data: Irregularity from the Nonlinear Interaction of Standing Waves?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chaos in Observational Variable Star Data: Irregularity from the Nonlinear Interaction of Standing Waves? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-836731