Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117..314d&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 2, Jan. 1983, p. 314-318.
Astronomy and Astrophysics
Astrophysics
17
Astronomical Models, Infrared Spectra, Interstellar Masers, Orion Nebula, Silicon Isotopes, Silicon Oxides, Brightness Temperature, Line Spectra, Molecular Clouds, Oxygen Isotopes, Radiation Sources, Thermal Emission, Vibrational Spectra
Scientific paper
A core halo model is considered in order to explain the SiO-29 maser, as well as the SiO-28, -29 and -30 thermal emission, in the ground vibrational state of the IR source IRc2 in Orion. While the SiO-29 maser emission originates in the core and undergoes steady mass loss at a rate of about 0.0001 solar masses/year, the thermal emission arises in the halo. The SiO vapor content in the core is about 50-100 per cent of the Si cosmic abundance, yet in the halo it may be as low as about 0.2 percent. The high SiO vapor content in the core is probably due to shock waves propagating from the central star, which partially destroy silicate grains. It is further suggested that vibrationally excited SiO-28 masers may be radiatively pumped by 8-micron photons that are emitted from a thin dust shell located in the inner region close to the photosphere.
Deguchi Shigeki
Nguyen-Quang-Rieu
No associations
LandOfFree
SiO isotope emission from Orion - A model for IRc2 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 SiO isotope emission from Orion - A model for IRc2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SiO isotope emission from Orion - A model for IRc2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1195080