The occulting effect of the transition region on emergent spectra of accretion discs |
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| Authors: | Zhu Ci-sheng and Li Zong-yun |
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| Institution: | Department of Astronomy, Nanjing University, Nanjing 210008, China |
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| Abstract: | There may exist a transition region from the geometrically thick outer region to the geometrically thin inner region in accretion discs. In this paper we calculate the spectra emitted by the portions of the inner region which are not occulted by the transition region, and deduce the emergent spectra of accretion discs to be observed, taking into account the reflection effect of radiation by the transition region. Our results show that the difference between these emergent spectra of discs and the standard ones of steady accretion disc models is significant when the central portion of discs is occulted by the transition region. It might play a role in the explanation of continuous spectra for some dwarf novae. |
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| Keywords: | accretion discs spectra dwarf novae |
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