Abstract
One of the most intriguing results emerging from extended observations of X-ray sources is that in at least two cases the period of the rapid variation is decreasing1–4. Thus, Her X-1 has a “pulsar” period of ∼1.2 s decreasing by ∼4.5 µ;s in ∼6 months, and Cen X-3 has a period of ∼4.8 s decreasing by ∼200 µs in ∼6 months.
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CHAU, W. Speeding Up of Pulsing X-ray Sources. Nature Physical Science 243, 133–134 (1973). https://doi.org/10.1038/physci243133a0
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DOI: https://doi.org/10.1038/physci243133a0
