NASA NTRS · 19840046416
X-ray observations of X Persei
Abstract
The HEAO 2 Einstein Observatory was used to confirm the identification of 4U 0352 + 30 with X Per. The HEAO 2 data were analyzed in order to determine an additional point in the pulse period history of the X-ray source and to search for short binary periods. In addition, a majority of the historical X-ray observations was reanalyzed and more refined values for the pulse period as a function of time were obtained. The period history possess significant scatter, but no evidence for a measurable long-term spin-up trend is found, and hence a lower limit to the spin-up time scale is set. This lower limit is consistent with the presence of a neutron star, but it does not rule out a degenerate dwarf. The period history was also searched for evidence of binary motion, and upper limits to a(x) sin i were obtained.
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Weisskopf, M. C., Elsner, R. F., Darbro, W., Naranan, S., Williams, A., Weisskopf, V. J., White, N. E., Grindlay, J. E., Sutherland, P. G.. 1984-03-15. X-ray observations of X Persei. https://ntrs.nasa.gov/citations/19840046416
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