X-ray observations of X Persei

Details X-ray observations of X Persei X-ray observations of X Persei

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..711w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 711-715.

Astronomy and Astrophysics

Astronomy

23

B Stars, Binary Stars, X Ray Sources, Black Holes (Astronomy), Heao 2, Periodic Variations

Scientific paper

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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