Article (Scientific journals)
Forbidden lines in a newly formed H II region
Manfroid, Jean
1975In Astronomy and Astrophysics, 43, p. 149-152
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Keywords :
ASTRONOMICAL SPECTROSCOPY; FORBIDDEN BANDS; H II REGIONS; LINE SPECTRA; NEBULAE; STELLAR EVOLUTION; FINITE DIFFERENCE THEORY; GAS IONIZATION; HYDRODYNAMIC EQUATIONS; INTERSTELLAR GAS; PRESSURE DISTRIBUTION; SHOCK WAVES; TIME DEPENDENCE
Abstract :
[en] The initial evolution of a spherically symmetric H II region forming around a star of 36 solar masses is calculated numerically using a program based on a finite-difference scheme extrapolated from those previously proposed for solving hydrodynamic problems involving shock waves. The helium abundance is assumed to be 10 per cent, and no account is taken of magnetic fields, turbulent motions, or interstellar grains. The evolution of the positions of the hydrogen and helium ionization fronts is plotted as a function of time, and the total spectra of the forbidden emission lines of C II, N II, N III, O II, O III, Ne II, and Ne III are computed at each time. The intensities of the 29 strongest lines at five different epochs are compared with a rough estimate of the total strength of H-beta. The temporal evolution of the nebula and the emission lines is described qualitatively.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Forbidden lines in a newly formed H II region
Publication date :
01 September 1975
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
43
Pages :
149-152
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
A&AA ID. AAA014.131.533
Available on ORBi :
since 01 February 2010

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