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Science 14 April 1967:
Vol. 156. no. 3772, pp. 239 - 240
DOI: 10.1126/science.156.3772.239
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Articles

Intensity Fluctuations of a Relativistically Expanding Source

Albert G. Petschek 1

1 New Mexico Institute of Mining and Technology, Socorro

It is shown that the relation between the size of an object and the period of a fluctuation in its brightness must be modified if the surface whose brightness is fluctuating is expanding at a relativistic velocity, in the sense that faster fluctuations are possible for the expanding surface.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)