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Pulsar PSR 1744-24A - Timing, eclipses, and the evolution of neutron star binaries

Nice, D. J. and Thorsett, S. E. (1992) Pulsar PSR 1744-24A - Timing, eclipses, and the evolution of neutron star binaries. Astrophysical Journal, 397 (1). pp. 249-259. ISSN 0004-637X. doi:10.1086/171784.

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This paper presents an analysis of 1.7 yrs of high-precision timing measurements of the millisecond pulsar PSR 1744-24A. The timing position of the pulsar shows it to be 40 arcsec from the core of the globular cluster Terzan 5, coincident with a steep-spectrum continuum source. The observed negative pulsar period derivative of -1.9 +/- 0.2 x 10^(-20) is biased by acceleration of the system in the gravitational fields of the cluster and possibly the Galactic center. A strong attenuation of the pulsed signal occurs near the eclipse edges, and excess time delays of the pulsed signal are observed during eclipses. Eclipse characteristics vary as a function of frequency and, even at a single frequency, orbital phases of eclipse edges are somewhat variable. The upper limit on changes in the orbital period puts a lower limit of 40 Myr on the time scale of orbital evolution. The implications of these observations are discussed.

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Additional Information:© 1992 American Astronomical Society. Received 1991 December 17; accepted 1992 March 20. we thank Z. Arzoumanian and M. McKinnon for help with the data collection, and J. Taylor and A. Fruchter for useful discussions and help with the early stages of this project. The Green Bank observatory and the Very Large Array are facilities of the National Radio Astronomy Observatory, operated by Associated Universities, Inc., under contract from the National Science Foundation. Observations were supported in part by grants from the Department of Education and the NSF. S. E. T. is supported by a Robert A. Millikan Research Fellowship.
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Robert A. Millikan FellowshipUNSPECIFIED
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ID Code:76224
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Deposited On:08 Mar 2018 22:54
Last Modified:15 Nov 2021 16:58

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