Accretion Disk Dynamics of Her X-l
| Autor: | F. H. Cheng, S. D. Vrtilek |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Rotation period
Physics Astrophysics::High Energy Astrophysical Phenomena Flux Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics medicine.disease_cause Occultation Neutron star Intermediate polar Magnitude (astronomy) medicine Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Variation (astronomy) Astrophysics::Galaxy Astrophysics Ultraviolet |
| Zdroj: | Cataclysmic Variables and Related Objects ISBN: 9789401066327 |
| DOI: | 10.1007/978-94-009-0325-8_115 |
| Popis: | The Her X-l/HZ Her system consists of a neutron star with a rotation period of 1.24 s orbiting a ‘normal’ stellar companion every 1.7 d. Variation in optical and ultraviolet magnitude is attributed to X-ray heating on the side facing the active neutron star with some contribution from X-ray heating of the disk. The system also has a 35-day period in which the X-ray emission displays so-called main and short ‘on’ states separated by relative X-ray quiescence. The 1.7-day optical flux variations continue throughout the 35-day period. No clear consensus exists as to the origin of the 35-day period; a popular interpretation is that of occultation of the compact X-ray source by a tilted, precessing, accretion disk. |
| Databáze: | OpenAIRE |
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