Photoproduction of ultraviolet emission lines

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/131792· OSTI ID:7262232

Ferland, G J

In this note, it is pointed out that removal of inner electrons by photoionization can produce ultraviolet emission lines of observable intensity. In the case of C(+) + h(nu) = more than C(2+) + e, ionization by photons with energies greater than 31 eV produces ions which then preferentially populate the excited C III 3P state. Calculations show that photoproduction of lines such as C III 1909 A can be competitive with collisional excitation in low-temperature, low-ionization nebulae such as H II regions, and could affect abundance or ionization studies. In general, this production mechanism should be considered whenever the ultraviolet lines have intensities a few tens of percent of H-beta. 23 references.

• Research Organization: Ohio State Univ., Columbus
• OSTI ID: 7262232
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Journal Name: Publ. Astron. Soc. Pac.; (United States) Vol. 98; ISSN PASPA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
H2 REGIONS
IONIZATION
NEBULAE
PHOTOIONIZATION
RADIATIONS
SPECTRA
ULTRAVIOLET RADIATION