Photometry and proper motion of the VELA pulsar.

Details Photometry and proper motion of the VELA pulsar. Photometry and proper motion of the VELA pulsar.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..839n&link_type=abstract

Astronomy and Astrophysics, v.323, p.839-843

Astronomy and Astrophysics

Astrophysics

40

Pulsars: Individual: Vela Pulsar, Astrometry

Scientific paper

We present the first UBVR photometry of the Vela Pulsar. All observed colours lie significantly above any Rayleigh-Jeans extrapolation of the ROSAT soft X-ray black body curve. While the U, B and V fluxes can be described by a flat power law, the R point lies about 1 magnitude below the expectation. An evidence for a similar spectral turnover, but at longer wavelength, was also claimed for the Crab Pulsar, another young INS with non-thermal optical emission. However, to account for the Vela R point in term of synchrotron self absorption, the emission geometry of the two pulsars must be different. In parallel, we have used the new images to re-assess the proper motion of the Vela pulsar, an effect for which vastly different results have been reported in the literature.

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