Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..701h&link_type=abstract
Astronomical Journal, vol. 82, Sept. 1977, p. 701-705.
Astronomy and Astrophysics
Astronomy
31
Pulsars, Radiant Flux Density, Radio Astronomy, Radio Spectra, Autocorrelation, Periodic Variations, Power Spectra, Precession, Radio Frequencies, Stellar Models
Scientific paper
The paper presents daily observations of pulsar mean pulse fluxes recorded over a four-year period at 156 MHz and, simultaneously for a shorter period, at 390 MHz. The observations yield characteristic time scales for correlated flux changes of a few tens of days, with an apparent low-frequency cutoff to the variations of several hundred days. A search for periodic modulation allows a strict limit to be set on the amplitude of neutron-star precession in the period range of 2-150 days for most sources. The modulation index for the high-frequency data is generally greater than that for the low-frequency fluxes, although the time scales for variations appear to be frequency-independent. The fluxes at the two frequencies are not, in general, well correlated, although strong correlations sometimes persist for up to a few weeks before the ratio of the fluxes changes to a new value. Some implications of these temporal flux and spectral changes are discussed.
Fowler Lee A.
Helfand David J.
Kuhlman J. V.
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