'Bound free' diaporamas de présentation

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Recall....

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Physical Processes Definitions Sources of Opacity Hydrogen bf and ff H - H 2 He Scattering. How does k n affect the spectrum? More continuous absorption, less continuum light at that wavelength More continuous absorption, lines must form in shallower layers, at lower optical depth

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Physical Processes Definitions Sources of Opacity Hydrogen bf and ff H - H 2 He Scattering. How does k n affect the spectrum? More continuous absorption, less continuum light at that wavelength More continuous absorption, lines must form in shallower layers, at lower optical depth

488 views • 34 slides

Continuous Opacity Sources

Continuous Opacity Sources. Continuous Opacity Sources. Principal Sources: Bound-Bound Transitions Bound-Free Free-Free (Bremstralung) Electron Scattering (Thompson & Compton) Molecular Transitions We consider only H or H-Like cases

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Continuum Absorption (Hubeny & Mihalas 7; Gray 8)

Continuum Absorption (Hubeny & Mihalas 7; Gray 8). H b-f, f-f H - opacity Other sources Scattering. H bound-free. H bound-free. H bound-free. Final result is sum over all levels that can be ionized by photon of given frequency Dominant in spectral types B, A. H free-free.

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Morphology

Morphology. The study of word formation. Observations. Boldest = bold + est bold cannot be divided Boy has a meaning in itself At does not have a meaning, it indicates relationship Serve can be a word, pre - as in preserve cannot Friendliest works, friendestly does not.

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NLTE_5_30

NLTE_5_30. ?? ??. Subroutine opac. [ Opac ] calculate standard and background opacity [OPINIT] initialize opacity package [INJON]read data about atoms for JON [INABS]reading data about absorption coefficient [ABSKO] administer absorption coefficient

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Free-Free Absorption from H I

Free-Free Absorption from H I. Much less than bf absorption Kramers (1923) + Gaunt (1930) again Absorption coefficient depends on the speed of the electron (slower electrons are more likely to absorb a photon because their encounters with H atoms take longer)

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total bound (cpm)

800. 700. 600. 500. 400. 300. 200. 100. 0. A. B. 0.005. Kd = 7.04 nM. 0.004. 0.003. Bound / free. total bound (cpm). 0.002. 0.001. 0.000. 0 2 4 6 8 10. 0.000. 0.010. 0.020. 0.030. 0.040. radiolabeled E2 (nM).

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