Physics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..803..154a&link_type=abstract
BAYESIAN INFERENCE AND MAXIMUM ENTROPY METHODS IN SCIENCE AND ENGINEERING: 25th International Workshop on Bayesian Inference and
Physics
Spectroscopy And Spectrophotometry, Inference Methods, Time Series Analysis, Time Variability, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification
Scientific paper
White Dwarfs are stars near the end of their lives which may pulsate with periods of a few minutes, and which can be observed to brighten and dim as they pulsate.
Observations of white dwarf light curves are characterised by broken time series (where days intervene between nighttime observations). Moreover the pulsation frequencies show appreciable amplitude harmonics (i.e. where frequency f appears so to do frequencies 2f, 3f, etc.) as well as frequency coupling (if frequencies f1 and f2 are observed, so too is f1 + f2).
In this paper the Bayesian spectral analysis approach due to Bretthorst is applied to the analysis of the light curves of white dwarfs. The method yields estimates of the dominant pulsation frequencies which are highly accurate and superior to estimates obtained from classical Fourier techniques. We discuss some of the particular problems which arise in the analysis of white dwarf light curves.
Arnold Richard
Sullivan Denis
Vignaux Tony
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