VLBI Astrometry of the Millisecond Pulsar B1937+21

Details VLBI Astrometry of the Millisecond Pulsar B1937+21 VLBI Astrometry of the Millisecond Pulsar B1937+21

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111..315d&link_type=abstract

Astronomical Journal v.111, p.315

Astronomy and Astrophysics

Astronomy

6

Pulsars: Individual: B1937+21, Astrometry

Scientific paper

We report the results of astrometric VLBI observations of PSR B1937+21. Observations of the pulsar and a nearby quasar were made at 1.67 GHz, using four antennas: Arecibo, the very large array, and the DSN 70 m antennas in California and Spain. We determine a position of α=19h39m38s.5611±0s.0003 and ρ=21°34'59".118±0.016 for the pulsar in the lERS extragalactic reference frame at epoch 1990.2. The accuracy of our result in right ascension is limited by systematic uncertainties in the ionospheric delay calibration, and larger-than-expected random scatter in the pulsar delays related to interstellar scintillation. The accuracy in declination is limited by the lack of a long north-south baseline in our experiment and the uncertainty of the location of the Arecibo antenna in the lERS celestial reference frame. When compared with the pulsar's timing position [Kaspi, et al., ApJ, 428, 713 (1994)] in the planetary ephemeris reference frame, our result yields a measurement of the offset of the lERS reference frame and the DE200 planetary ephemeris frame of Δα(IERS-DE200)=0.0008±0s0.0003 and Δρ(IERS-DE200)=-0.024±0.016, which is in reasonable agreement with the frame-tie rotation determined by Folkner et al. [ARA&A, 297, 279, (1994)].

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