Physical Parameter Eclipse Mapping
| Autor: | Keith Horne, F. V. Hessman, Sonja Vrielmann |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Disc size White dwarf Astronomy Cataclysmic variable star Astronomy and Astrophysics Astrophysics Light curve Accretion (astrophysics) Accretion disc Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 306:766-778 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1046/j.1365-8711.1999.02550.x |
| Popis: | The tomographic method Physical Parameter Eclipse Mapping is a tool to reconstruct spatial distributions of physical parameters (like temperatures and surface densities) in accretion discs of cataclysmic variables. After summarizing the method, we apply it to multi-colour eclipse light curves of various dwarf novae and nova-likes like VZ Scl, IP Peg in outburst, UU Aqr, V2051 Oph and HT Cas in order to derive the temperatures (and surface densities) in the disc, the white dwarf temperature, the disc size, the effective temperatures and the viscosities. The results allows us to establish or refine a physical model for the accretion disc. Our maps of HT Cas and V 2051Oph, for example, indicate that the (quiescent) disc must be structured into a cool, optically thick inner disc sandwiched by hot, optically thin chromospheres. In addition, the disc of HT Cas must be patchy with a covering factor of about 40% caused by magnetic activity in the disc. |
| Databáze: | OpenAIRE |
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