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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1984
- DOI:
- 10.1086/161840
- Bibcode:
- 1984ApJ...278..711W
- Keywords:
-
- B Stars;
- Binary Stars;
- X Ray Sources;
- Black Holes (Astronomy);
- Heao 2;
- Periodic Variations;
- Astrophysics