ABSTRACT We have obtained spectroscopic measurements of the P s = 1.8 ms, P B = 6.5 hr black-widow (BW) pulsar PSR J1301+0833 as part of a program to investigate optical companions of wind-shrouded pulsars. The derived radial-velocity amplitude ( ) and inclination ( ) imply a neutron star mass , smaller (for similar fit assumptions) than that of the well-studied original BW pulsar PSR J1959+2048, which shares similar values of P s and P B . This fit, which assumes , indicates a small heated region on the (anomalously faint) companion. With a free distance and full surface heating the best fit is statistically acceptable, but the large inferred is inconsistent with the observed pulsar proper motion. Improved photometry and heating models will be needed to refine these measurements.
S. J. McSweeney, N. D. R. Bhat, N. A. Swainston, K. R. Smith, Sanjay Kudale, P. J. Hancock, W. van Straten, Shi Dai, R. M. Shannon, S. J. Tingay, M. Johnston‐Hollitt, David Kaplan, M. Walker
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