Engineering topics
Publications and source records attributed to Armstrong, B. K..
Average 430-MHz pulse profiles and, where possible, modulation indices and pulse-nulling fractions are computed for 28 pulsars. Morphological classifications are determined for most of the pulsars. It is found that core emission components tend to have lower modulation indices than conal components, and that pulsars having only a core component never exhibit pulse pulling. PSR 1612 + 07 is shown to undergo mode changes.
A simple sensitometer for use in providing intensity calibration on photographic plates, which has been in use for many years at Palomar Observatory, is described. External comparison between reduced photographic aperture magnitudes for galaxies and CCD photometry for the same objects shows that use of this device results in proper intensity scales. The intensity scale produced using this instrument also agrees well with that produced by the KPNO spot sensitometers.