Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.192....7t&link_type=abstract
In ESA Galactic and Extragalactic Infrared Spectroscopy p 7-10 (SEE N83-18593 08-88)
Astronomy and Astrophysics
Astronomy
1
Infrared Spectroscopy, Line Spectra, Near Infrared Radiation, Stellar Evolution, Stellar Spectra, Emission Spectra, H Ii Regions, Hydrogen, Ionization, Molecular Clouds, Radio Emission, Radio Sources (Astronomy), Stellar Luminosity, Stellar Winds
Scientific paper
Near infrared spectroscopic studies of obscured objects in star formation regions yielded a new class of object. The new class is defined by an excess of emission in the Brackett lines of hydrogen over that expected from an H II region around a ZAMS star of the same luminosity. Very low or undetectable radio flux also characterizes the class. Other characteristics include broad lines and in some cases bipolar mass flows and distributions. Several theories were formulated to account for the properties of the class. The theories include stellar winds, viscous disks and deviations from case B recombination. The most likely theory which postulates ionization from the n = 2 level of hydrogen. Line excess objects are probably a major contributor to the supporting kinetic energy of molecular clouds.
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