Computer Science – Numerical Analysis
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..295w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 295-309. Research supported by U.S. Navy and Leids
Computer Science
Numerical Analysis
32
Pulsars, Stellar Orbits, Stellar Oscillations, Stellar Rotation, X Ray Binaries, Fourier Transformation, Numerical Analysis, Phase Modulation, Signal To Noise Ratios, Stellar Models
Scientific paper
High-sensitivity search techniques for millisecond periods are presented and applied to data from the Japanese satellite Ginga and HEAO 1. The search is optimized for pulsed signals whose period, drift rate, and amplitude conform with what is expected for low-class X-ray binary (LMXB) sources. Consideration is given to how the current understanding of LMXBs guides the search strategy and sets these parameter limits. An optimized one-parameter coherence recovery technique (CRT) developed for recovery of phase coherence is presented. This technique provides a large increase in sensitivity over the method of incoherent summation of Fourier power spectra. The range of spin periods expected from LMXB phenomenology is discussed, the necessary constraints on the application of CRT are described in terms of integration time and orbital parameters, and the residual power unrecovered by the quadratic approximation for realistic cases is estimated.
Hertz Paul
Lewin Walter H. G.
Michelson Peter F.
Mitsuda Kazu
Norris Jay P.
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