Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20513906p&link_type=abstract
American Astronomical Society Meeting 205, #139.06; Bulletin of the American Astronomical Society, Vol. 36, p.1574
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have completed the development of a new model helium atom for the spectra simulation code Cloudy. All relevant astrophysically significant processes are included, and the spectrum is solved self-consistently with the thermal and ionization structure of the simulated system. We present here an overview of the differences that distinguish our model from those by previous authors. We also compare predicted case B emissivities with those from previous works. The differences will have significant consequences for the interpretation of spectra of a wide variety of systems. We also explore deviations from the case B approximation and present an estimate of the primordial helium abundance.
Bauman Robert P.
Ferland Gary J.
MacAdam K. B.
Porter Ryan L.
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