Abstract
The absorption and emission arrays in the unresolved transition array (UTA) and super transition array (STA) models are usually assumed to have the same Gaussian spectral shape. It is shown, starting from a Boltzmann population distribution, that the assumption of profile identity for both absorption and emission is inconsistent with Kirchhoff's law. A correcting formula is established. It is extended to the cases where one or two effective population temperatures are involved. Examples are shown where the effect is noticeable.
| Original language | English |
|---|---|
| Pages (from-to) | 255-263 |
| Number of pages | 9 |
| Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume | 81 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - 2003 |
| Externally published | Yes |
Keywords
- Emissivities
- Opacities
- Super-transition arrays
- Unresolved transition arrays
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