The Vela Pulsar in the Ultraviolet

Details The Vela Pulsar in the Ultraviolet The Vela Pulsar in the Ultraviolet

2005-03-15

arxiv.org/abs/astro-ph/0503331v1

Astrophys.J. 627 (2005) 383-389

Astronomy and Astrophysics

Astrophysics

14 pages, 7 figures, to appear in the Astrophysical Journal

Scientific paper

10.1086/430269

We describe time-tagged observations of the Vela pulsar (PSR B0833-45) with the HST STIS MAMA-UV detectors. Using an optimal extraction technique, we obtain a NUV light curve and crude FUV phase-resolved spectra. The pulse is dominated by complex non-thermal emission at all phases. We obtain approximate spectral indices for the brightest pulse components, relate these to pulsations observed in other wavebands, and constrain the thermal surface emission from the neutron star. An upper limit on the Rayleigh-Jeans component at UV pulse minimum suggests a rather low mean surface temperature T_eff^\infty <4.6 x 10^5 (d_{300}/R_{14.2})^2 K. If confirmed by improved phase-resolved spectroscopy, this observation has significant impact on our understanding of neutron star interiors.

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