| Issue |
A&A
Volume 376, Number 1, September II 2001
|
|
|---|---|---|
| Page(s) | 213 - 216 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010951 | |
| Published online | 15 September 2001 | |
Multicolor photometry of the Vela pulsar *,**
1
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, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
2
March
2001
Accepted:
29
June
2001
Abstract
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
Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc. under contract No. NAS 5-26555.
Based on observations collected at the European Southern Observatory, La Silla, Chile.
© ESO, 2001
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