Instability of the 13.8 Day Period in X-Ray Emission from 4U 1700-377
Abstract
We present a new result on long-term periodicity searches of the X-ray emission from 4U 1700-377 using RXTE ASM and CGRO BATSE data. The hard X-ray data (20-200 keV) from early BATSE observations (1780 days from JD 2,448,370, before RXTE observations started) show evidence of a 13.8 day periodicity. The long-term periodicity became substantially less prominent in the data from later BATSE observations and in the soft X-ray data from the ASM (2-10 keV) observations. We demonstrate that disk precession models can explain the 13.8 day period and its instability in the X-ray emission from 4U 1700-377.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2004
- DOI:
- 10.1086/379700
- arXiv:
- arXiv:astro-ph/0309654
- Bibcode:
- 2004ApJ...600..743H
- Keywords:
-
- Galaxy: Center;
- Gamma Rays: Observations;
- X-Rays: Stars;
- Astrophysics
- E-Print:
- 11 pages, 9 figures, 2 tables