Infrared forbidden lines in H II regions and planetary nebulae

Details Infrared forbidden lines in H II regions and planetary nebulae Infrared forbidden lines in H II regions and planetary nebulae

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....39...43s&link_type=abstract

Astronomy and Astrophysics, vol. 39, no. 1, Feb. 1975, p. 43-60.

Astronomy and Astrophysics

Astrophysics

73

Abundance, Forbidden Bands, H Ii Regions, Hydrogen Ions, Infrared Spectra, Line Spectra, Planetary Nebulae, Emissivity, Mass Ratios, Oxygen, Self Absorption, Sulfur

Scientific paper

Emissivity coefficients are calculated as functions of electron density and temperature for the IR forbidden lines between 2 and 300 microns of the elements and ionization stages most abundant in H II regions and planetary nebulae. The effect of self-absorption is investigated, and a method is presented for estimating when self-absorption may be important. The IR line spectrum of the Orion Nebula is predicted using the emissivity coefficients, and ionic abundances are derived for the Ar III, S IV, and Ne II forbidden lines in a number of planetary nebulae. The sulfur abundance and sulfur/oxygen ratio are discussed for H II regions and planetary nebulae. The average sulfur/oxygen ratio is found to be about 0.05 for gaseous nebulae.

Affiliated with

Also associated with

No associations

Rating

Infrared forbidden lines in H II regions and planetary nebulae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Infrared forbidden lines in H II regions and planetary nebulae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared forbidden lines in H II regions and planetary nebulae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-998126