1987•Publications of the Astronomical Society of JapanRequires access
Pulse Period of X Persei
Toshio Murakami, Takeshi Ikegami, Hajime Inoue, Kazuo Makishima
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Abstract
Abstract The 13.9-min pulsating X-ray source 4U 0352+30/X Per was observed by the Tenma satellite. A pulse period of 13.933±0.002 min, after heliocentric correction, was observed on JD 2,446,016 in 1984. This pulse period is the longest observed to date. The fluctuation of the pulse period looks similar to those of pulsars such as Vela X-1 and GX 301–2, and the rate of change of the pulse period can be explained only if the rotating body is a neutron star. However, the observed luminosity may be too low to explain the observed period derivative by present theories.