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Hercules x-1: spectral variability of an x-ray pulsar in a stellar binary system. ph.d. thesis
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pravdo, S. H. |
| Copyright Year | 1976 |
| Description | A cosmic X-ray spectroscopy experiment onboard the Orbiting Solar Observatory 8 (OSO-8), observed Her x-1 continuously for approximately 8 days. Spectral-temporal correlations of the X-ray emission were obtained. The major results concern observations of: (1) iron band emission, (2) spectral hardening (increase in effective x-ray temperature) within the X-ray pulse, and (3) a transition from an X-ray low state to a high state. The spectrum obtained prior to the high state can be interpreted as reflected emission from a hot coronal gas surrounding an accretion disk, which itself shields the primary X-ray source from the line of sight during the low state. The spectral hardening within the X-ray pulse was indicative of the beaming mechanism at the neutron star surface. The hardest spectrum by pulse phase was identified with the line of sight close to the Her x-1 magnetic dipole axis, and the X-ray pencil beam become harder with decreasing angle between the line of sight and the dipole axis. |
| File Size | 6759593 |
| Page Count | 169 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770008019 |
| Archival Resource Key | ark:/13960/t6450g55v |
| Language | English |
| Publisher Date | 1976-12-01 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Electric Corona Hercules Nova Binary Stars Pulsars Spectral Emission Spectroscopic Analysis Oso-8 Cosmic X Rays Pencil Beams Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Thesis |
