Systematic variation of the residual of PSR B1937+21, the trace of its companion star?

2003/09/23 by B. P. Gong, Gong, B. P.
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0309603

15 pages, 6 tables, 3 figures

arxiv created 2003/09/25 · arxiv updated 2009/12/01

Abstract

PSR B1937+21 was the first millisecond pulsar ever measured. Which has been appeared as a singular pulsar. The high-precision observation of this pulsar shows systemic long-term variation in the residual of time of arrivals. This paper modelled the secular variation by the orbital precession induced time delay of a binary pulsar system. The fitting requires that as a binary pulsar, PSR B1937+21 should have small companion star, m₂∼ 10^-2M_\odot, and projected semi-major axis, x∼ 10^-4s to 10^-3s. Which corresponds to ignorable radial velocity of the pulsar to the line of sight. This might explain why it has been measured as a singular pulsar instead of a binary pulsar.

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