Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110206n&link_type=abstract
American Astronomical Society, AAS Meeting #211, #102.06; Bulletin of the American Astronomical Society, Vol. 39, p.918
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present results of an campaign of timing observations Pulsars J0621+1002 and J0751+1807 made at the Arecibo Observatory. These pulsars are in nearly circular orbits with white dwarf companions. Combining the new data with observations made over the previous decade, has yielded substantial improvements in measurements of relativistic phenomena in the pulsars' orbits. In particular, we have a refined measurement of the rate of orbital decay (due to emission of gravitational radiation) and improved detection of Shapiro delay for J0751+1807, and we have increased the precision of measurement of periastron advance
and placed new limits on Shapiro delay for J0621+1002. Preliminary analysis gives pulsar masses of 1.26±0.14 solar masses for J0751+1807, substantially smaller than the previously published value, and 1.7±0.2 for J0621+1002. Updated values will be presented at the meeting.
Kasian Laura E.
Nice David J.
Stairs Ingrid Helen
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