Spectral observations and physical modeling of Sharpless 121

Abstract

view Abstract Citations (6) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectral observations and physical modeling of Sharpless 121. Vallee, J. P. Abstract The nature of the object Sharpless 121 has been the subject of considerable controversy. Four interpretations have been given of the earlier observations: H II region, planetary nebula, compact source inside a supernova remnant, and nearby object superposed over an extragalactic radio source. New observations were made of this object, using the 46-m telescope of the Algonquin Radio Observatory, to obtain the hydrogen recombination lines and continuum near 3327 MHz and near 10,522 MHz. These observations practically eliminate all but one of the earlier interpretations. The ensuing physical modeling enables the derivation of the basic physical parameters of this shell-type H II region, and an application of stellar-wind theory gives its dynamical parameters. Publication: The Astronomical Journal Pub Date: October 1983 DOI: 10.1086/113436 Bibcode: 1983AJ.....88.1470V Keywords: Astronomical Models; Astronomical Spectroscopy; Stellar Winds; Continuous Radiation; Data Reduction; H Ii Regions; Line Spectra; Molecular Clouds; Recombination Reactions; Astronomy; H II Regions:Recombination Lines; H II Regions:Stellar Winds; Recombination Lines:H II Regions; Stellar Winds:H II Regions full text sources ADS | data products SIMBAD (1)