Theoretical He I emissivities in the case B approximation

R. L. Porter; R. P. Bauman; G. J. Ferland; K. B. Macadam

doi:10.1086/429370

Theoretical He I emissivities in the case B approximation

R. L. Porter, R. P. Bauman, G. J. Ferland, K. B. Macadam

Physics And Astronomy

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76 Scopus citations

Abstract

We calculate the He I case B recombination cascade spectrum using improved radiative and collisional data. We present new emissivities over a range of electron temperatures and densities. The differences between our results and the current standard are large enough to have a significant effect not only on the interpretation of observed spectra of a wide variety of objects, but also on determinations of the primordial helium abundance.

Original language	English
Pages (from-to)	L73-L75
Journal	Astrophysical Journal
Volume	622
Issue number	1 II
DOIs	https://doi.org/10.1086/429370
State	Published - Mar 20 2005

Keywords

Atomic data
Atomic processes
ISM: Atoms -
ISM: clouds
Plasmas

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/429370

Cite this

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title = "Theoretical He I emissivities in the case B approximation",

abstract = "We calculate the He I case B recombination cascade spectrum using improved radiative and collisional data. We present new emissivities over a range of electron temperatures and densities. The differences between our results and the current standard are large enough to have a significant effect not only on the interpretation of observed spectra of a wide variety of objects, but also on determinations of the primordial helium abundance.",

keywords = "Atomic data, Atomic processes, ISM: Atoms -, ISM: clouds, Plasmas",

author = "Porter, {R. L.} and Bauman, {R. P.} and Ferland, {G. J.} and Macadam, {K. B.}",

year = "2005",

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language = "English",

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T1 - Theoretical He I emissivities in the case B approximation

AU - Porter, R. L.

AU - Bauman, R. P.

AU - Ferland, G. J.

AU - Macadam, K. B.

PY - 2005/3/20

Y1 - 2005/3/20

N2 - We calculate the He I case B recombination cascade spectrum using improved radiative and collisional data. We present new emissivities over a range of electron temperatures and densities. The differences between our results and the current standard are large enough to have a significant effect not only on the interpretation of observed spectra of a wide variety of objects, but also on determinations of the primordial helium abundance.

AB - We calculate the He I case B recombination cascade spectrum using improved radiative and collisional data. We present new emissivities over a range of electron temperatures and densities. The differences between our results and the current standard are large enough to have a significant effect not only on the interpretation of observed spectra of a wide variety of objects, but also on determinations of the primordial helium abundance.

KW - Atomic data

KW - Atomic processes

KW - ISM: Atoms -

KW - ISM: clouds

KW - Plasmas

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UR - http://www.scopus.com/inward/citedby.url?scp=18744412954&partnerID=8YFLogxK

U2 - 10.1086/429370

DO - 10.1086/429370

M3 - Article

AN - SCOPUS:18744412954

SN - 0004-637X

VL - 622

SP - L73-L75

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

Theoretical He I emissivities in the case B approximation

Abstract

Keywords

ASJC Scopus subject areas

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