Journal article
Nonperiodic variations in astrophysical systems: Investigating frequency evolution
The Astrophysical journal, v 445(2), pp 861-871
01 Jun 1995
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We present a method related to the wavelet transform, the Gabor transform, for investigating astronomical time series containing nonconsistent frequencies. Instances in which such data sets may arise include variable star light curves, numerical studies of the gravitational three-body problem, X-ray binaries, and signals from more exotic objects such as planets around pulsars and mass infall from accretion structures onto compact objects. As an illustration of its power, we apply the technique to a numerical data set of a gravitational three-body interaction and to photometry of the rapidly oscillating peculiar A star HD 60435. In the three-body example, the method provides an insightful shorthand that allows for the determination of episodes where the system behaves as two nearly Keplerian orbits. For HD 60435, the power in the main frequency exhibits unusual evolution over the duration of the observation.
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Details
- Title
- Nonperiodic variations in astrophysical systems: Investigating frequency evolution
- Creators
- Patricia T. Boyd - Universities Space Research Association, Greenbelt, MDPatricia H. Carter - Naval Surface Warfare CenterRobert Gilmore - Drexel UniversityJoseph F. Dolan - NASA Goddard Space Flight Center
- Publication Details
- The Astrophysical journal, v 445(2), pp 861-871
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:A1995RA62500030
- Scopus ID
- 2-s2.0-11944254829
- Other Identifier
- 991019173445604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Astronomy & Astrophysics