Abstract
view Abstract Citations (56) References (52) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Excess line emission in protostellar objects Thompson, R. I. Abstract Observations of the infrared hydrogen Brackett lines have revealed that many protostellar objects show a significant excess of line flux over the flux expected from an H II region around a ZAMS star of the same luminosity. The line excess appears to be confined to objects with luminosities less than 100,000 solar luminosities. The observations which lead to these conclusions are presented and evaluated. Three possible mechanisms for the excess line flux are discussed: excess UV radiation due to the accretion of natal material onto the star, extended atmospheres due to stellar winds, and deviations from the Menzel case B recombination line strengths due to high density and optical depth in the H II region. Publication: The Astrophysical Journal Pub Date: June 1982 DOI: 10.1086/159975 Bibcode: 1982ApJ...257..171T Keywords: Emission Spectra; Infrared Spectra; Line Spectra; Protostars; Stellar Radiation; H Ii Regions; Hydrogen Ions; Interstellar Space; Ion Recombination; Main Sequence Stars; Radiant Flux Density; Spectral Line Width; Stellar Atmospheres; Stellar Evolution; Stellar Mass Accretion; Stellar Winds; Ultraviolet Radiation; Astrophysics full text sources ADS |
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
