Spectral flux from low-density photospheres - Approximate results

Details Spectral flux from low-density photospheres - Approximate results Spectral flux from low-density photospheres - Approximate results

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..800h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 800-809.

Astronomy and Astrophysics

Astrophysics

25

Photosphere, Radiative Transfer, Stellar Atmospheres, Supernovae, Balmer Series, Hubble Constant, Opacity, Photoionization, Spectral Emission, Stellar Models, Thermodynamic Equilibrium

Scientific paper

Radiative transfer through sharp, quasi-static atmospheres containing mostly hydrogen is considered at densities low enough that scattering dominates absorption and collisional excitations are negligible. It is found that the balance between photoionization and radiative recombination which governs the atomic level populations greatly reduces the effective absorptive opacity. Approximate results for the emergent continuum spectral flux are obtained, significantly different than if local thermodynamic equilibrium level populations were assumed. The flux jumps at the photoionization thresholds are relatively small for the photospheric temperatures Tp(v) greater than or about 6000 K considered, and Tp increases toward the far-ultraviolet. It appears that the lack of a Balmer jump in spectra of Type II supernovae implies that the flux is diluted below that of a blackbody at the same color temperature, which increases the value of the Hubble constant obtained by the Baade (1926) method.

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