Transients, and long-term periodicities in X-ray sources
Abstract
The high latitude transients and two kinds of low latitude transients, the hard and the soft ones, are briefly discussed together with long-term periodicities. The available data on the 35-day cycle of Her X-1 and indications from the All Sky Monitor (ASM) on Ariel V that Cen X-3 may have a similar cycle of about 43 days superposed on its well-known regular on/off behavior suggest that many other sources may also have a long-term periodicity. For Cyg X-r there are weak indications for a 17-day cycle. The use of a monitor with a somewhat greater sensitivity than the ASM on Ariel V, in conjunction with a basic large area detector, would facilitate the early detection of transients and the determination of long-term periodicities if they exist in sources other than Her X-1.
- Publication:
-
Compact Galactic X-Ray Sources
- Pub Date:
- 1979
- Bibcode:
- 1979cgxs.work..255P
- Keywords:
-
- Long Term Effects;
- Periodic Variations;
- X Ray Astronomy;
- X Ray Stars;
- Ariel 5 Satellite;
- Astronomical Catalogs;
- Binary Stars;
- Transient Response;
- Astrophysics