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Fast Photometry of the Crab, SN 1987A and Aussat

Published online by Cambridge University Press:  25 April 2016

K. M. Hill ,
A. B. Giles  and
R. D. Watson
K. M. Hill
Affiliation:
Physics Department, University of Tasmania
A. B. Giles
Affiliation:
Physics Department, University of Tasmania
R. D. Watson
Affiliation:
Physics Department, University of Tasmania
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Abstract

The appearance of SN 1987A led to the implementation of a fast sampling option in the data collection system of the photometer on the University of Tasmania’s optical telescope. This option permits acquisition of continuous data trains of over one hour’s duration at sample rates of 5 kHz. Monitoring of SN 1987 A at regular intervals has permitted upper limits to be assigned to any pulsed fraction of the optical flux. Successful test observations of the Crab pulsar have been obtained, as well as observations of the geostationary Aussat satellites during their bi-annual specular-reflection episodes. For the latter, very accurate spin rates (∼1 Hz) are determinable in short data runs because of the higher frequency components (∼100 Hz) in their light curves. These components are produced by the rows of solar cells on the outer surfaces of the satellites, and fast-Fourier transform analyses essentially permit the numbers of rows of cells to be counted precisely.

Type
Stellar
Information
Publications of the Astronomical Society of Australia , Volume 8 , Issue 1 , 1989 , pp. 75 - 77
Copyright
Copyright © Astronomical Society of Australia 1989

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