Journal article
Partially coherent scattering in stellar chromospheres. II: The first-order escape probability method
The Astrophysical journal, Vol.390(2), pp.573-582
05/10/1992
DOI: 10.1086/171308
Abstract
We derive approximate analytic expressions for resonance-line wing diagnostics, accounting for frequency redistribution effects, for homogeneous slabs and slabs with a constant Planck function gradient. The objective is to describe resonance-line emission profiles from a simplified conceptual standpoint, thereby allowing observers to obtain a rapid understanding of the basic physical parameters of the line-forming layers prior to performing detailed numerical simulations. As an example of the utility of the approach, we derive an approximate analytic expression for the dependence on stellar surface gravity of the location of the Ca II and Mg II resonance-line profile peaks. In so doing, we provide a helpful first step in quantifying the effects of partial redistribution on the overall scaling law known as the Wilson-Bappu effect.
Details
- Title: Subtitle
- Partially coherent scattering in stellar chromospheres. II: The first-order escape probability method
- Creators
- K. G Gayley - Joint Institute for Laboratory Astrophysics
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.390(2), pp.573-582
- Publisher
- University of Chicago Press
- DOI
- 10.1086/171308
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Language
- English
- Date published
- 05/10/1992
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428822302771
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