ESO, Karl Schwarzchild Str. 2, 85740 Garching bei München, Germany
2 Istituto di Fisica Cosmica del CNR "G. Occhialini", Via Bassini 15, 20133 Milan, Italy
Corresponding author: R. P. Mignani, email@example.com
Accepted: 29 June 2001
Multicolor photometry of the Vela pulsar (PSR B0833-45), updated by recent HST/WFPC2 observations obtained in the , and filters, is presented. The available data provide the best characterization so far of the pulsar spectral shape, which is dominated by a flat power law continuum with spectral index , consistent with the extrapolation in the optical domain of the power law component of the X-ray spectrum detected by CHANDRA. In addition, a marginally significant dip (≈3σ) seems to be present at about 6500 Å. Spectroscopic observations with the VLT, now in progress, will undoubtly provide a much better assessment of the reality and characteristics of this feature.
Key words: pulsars: individual: PSR B0833-45
© ESO, 2001