Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9156l&link_type=abstract
HST Proposal ID #9156
Computer Science
Hst Proposal Id #9156 Hot Stars
Scientific paper
We propose to do STIS/NUV/TIMETAG prism observations of the middle-aged { 10^5 year} pulsar PSR B0656+14. This would allow us to make for the first time phase- resolved spectroscopy of a middle-aged pulsar as a function of wavelength in the UV, and to study how the pulse profile of such a pulsar at these wavelengths differs from the only similar data available so far, namely those of the much younger Crab pulsar. This is important for the understanding of how the spectral evolution evolves with pulsar age. For the Crab pulsar, non-thermal emission dominates strongly at all wavelengths, while for PSR B0656+14 thermal emission from the cooling surface of the neutron star dominates in the EUV - soft X-ray band. The broad-band photometry of PSR B0656+14 shows a turn-over from a power-law component in the optical toward the Rayleigh-Jeans part of the thermal component in the NUV. Our observations will reveal a possible further increase of the flux toward shorter wavelengths, and will follow the changes in the pulse profile. We will also determine the pulsed fraction to distinguish between the non-thermal and thermal components. For a plausible pulsed fraction we are even likely to detect spectral variations over the pulse period.
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