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Title:IDENTIFICATION OF VO (X4Σ) IN THE ENVELOPE OF VY CMa: A NEW CIRCUMSTELLAR MOLECULE
Author(s):Bernal, Jacob
Contributor(s):Humphreys, Roberta M.; Ziurys, Lucy M.
Subject(s):Astronomy
Abstract:We have confirmed a new circumstellar molecule, VO, observed in the envelope of the supergiant star, VY Canis Majoris, using the Hubble Space Telescope (HST) with its Imaging Spectrograph (STIS). The molecule, a free radical, was detected in two clumps in the ejecta of this star via its B-X electronic transition in the near-infrared. The spectra are clearly circumstellar as the lines are significantly red-shifted from the stellar velocity, and arise from material 40-50 R* from the star. Wallerstein had identified some of the observed lines previously towards VY CMa; our data prove their spatial location. The VO lines are likely excited by resonant scattering from the star through a hole in the dusty shell.
Issue Date:2019-06-19
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/104414
DOI:10.15278/isms.2019.WA03
Rights Information:Copyright 2019 Jacob Bernal
Date Available in IDEALS:2019-07-15
2020-01-25


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