Abstract
view Abstract Citations (48) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hot Water around Late-Type Stars: Detection of Two Millimeter-Wave Emission Lines from the nu 2 Vibrationally Excited State Menten, Karl M. ; Melnick, Gary J. Abstract The first astronomical detection of two millimeter-wave emission lines from vibrationally excited water is reported. The 96 GHz 4(40)-5(33) and the 232 GHz 5(50)-6(43) rotational transitions within the nu2 vibrationally excited state of H2O have been discovered toward the supergiant star VY CMa. The latter transition was also detected toward the semiregular variable W Hya. The 4(40)-5(33) transition shows definite signs of maser action while the 5(50)-6(43) emission may be of (quasi-)thermal nature. Based on a comparison of the line profiles of the 22 GHz H2O masers, various SiO maser lines, and the nu2 H2O emission, it is concluded that the vibrationally excited H2O and the SiO masers probably arise from a region in which the expansion of the circumstellar envelope has not yet begun and some infalling motions are present. This region is closer to the star than the part of the envelope that gives rise to the 22 GHz H2O masers. Publication: The Astrophysical Journal Pub Date: June 1989 DOI: 10.1086/185465 Bibcode: 1989ApJ...341L..91M Keywords: Interstellar Masers; Late Stars; Molecular Excitation; Stellar Envelopes; Water Masers; Electron Transitions; Molecular Rotation; Radio Emission; Silicon Oxides; Vibrational Spectra; Astrophysics; MASERS; STARS: CIRCUMSTELLAR SHELLS; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (8)
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