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Long-term studies with the ariel-5 asm. 1: her x-1, vela x-1 and cen x-3. [periodic variations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Serlemitsos, P. J. Boldt, E. A. Holt, S. S. Kaluzienski, L. J. |
| Copyright Year | 1978 |
| Description | Twelve hundred days of 3-6 keV X-ray data from Her X-1, Vela X-1 and Cen X-3 accumulated with the Ariel-5 all-sky monitor are interrogated. The binary periodicities of all three can be clearly observed, as can the approximately 35-d variation of Her X-1, for which we can refine the period to 34.875 plus or minus .030-d. No such longer-term periodicity less than 200-d is observed from Vela X-1. The 26.6-d low-state recurrence period for Cen X-3 previously suggested is not observed, but a 43.0-d candidate periodicity is found which may be consistent with the precession of an accretion disk in that system. The present results are illustrative of the long-term studies which can be performed on approximately 50 sources over a temporal base which will ultimately extend to at least 1800 days. |
| File Size | 2323715 |
| Page Count | 23 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780022075 |
| Archival Resource Key | ark:/13960/t8sb8w94b |
| Language | English |
| Publisher Date | 1978-07-01 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Ariel Satellites Hercules Nova Binary Stars Stellar Radiation X Ray Astronomy Periodic Variations Fast Fourier Transformations Data Reduction X Ray Sources Centaurus Constellation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
