Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..249n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 249-259.
Astronomy and Astrophysics
Astrophysics
35
Eclipsing Binary Stars, Globular Clusters, Gravitational Fields, Neutron Stars, Pulsars, Stellar Evolution, Companion Stars, Eclipses, Orbital Mechanics, Very Large Array (Vla)
Scientific paper
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 exp -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.
Nice David J.
Thorsett Stephen. E.
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