Gas phase SiO in the circumstellar environment of the recurrent nova T Coronae Borealis

We report the discovery of the diatomic molecule SiO in the gas phase in the environment of the recurrent nova T Coronae Borealis. While some of the SiO is photospheric, a substantial portion must arise in the wind from the red giant component of T CrB. A simple fit to the SiO feature, assuming loca...

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Bibliographic Details
Published in:arXiv.org 2019-04
Main Authors: Evans, A, Pavlenko, Ya V, Banerjee, D P K, Munari, U, Gehrz, R D, Woodward, C E, Starrfield, S, Helton, L A, Shahbandeh, M, Davis, S, Dallaporta, S, Cherini, G, Collaboration, ANS
Format: Article
Language:English
Subjects:
Coronas
Density
Gamma rays
Infrared photometry
Local thermodynamic equilibrium
Nucleation
Photometry
Photosphere
Vapor phases
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Summary:We report the discovery of the diatomic molecule SiO in the gas phase in the environment of the recurrent nova T Coronae Borealis. While some of the SiO is photospheric, a substantial portion must arise in the wind from the red giant component of T CrB. A simple fit to the SiO feature, assuming local thermodynamic equilibrium, suggests a SiO column density of 2.8x10^17 /cm2 and temperature ~1000K; the SiO column density is similar to that present in the winds of field red giants. A search for SiO maser emission is encouraged both before and after the next anticipated eruption. We find that the 12C/13C ratio in the red giant is
ISSN:2331-8422
DOI:10.48550/arxiv.1904.04731