The Role of Ultraviolet Photons in Circumstellar Astrochemistry

T. J. Millar

doi:10.1063/1674-0068/cjcp2008145

Volume 33 Issue 6

Dec. 2020

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Chinese Journal of Chemical Physics > 2020 > 33(6): 668-679. > DOI: 10.1063/1674-0068/cjcp2008145

T. J. Millar. The Role of Ultraviolet Photons in Circumstellar Astrochemistry[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 668-679. DOI: 10.1063/1674-0068/cjcp2008145

Citation:

T. J. Millar. The Role of Ultraviolet Photons in Circumstellar Astrochemistry[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 668-679. DOI: 10.1063/1674-0068/cjcp2008145

Citation:

T. J. Millar. The Role of Ultraviolet Photons in Circumstellar Astrochemistry[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 668-679. DOI: 10.1063/1674-0068/cjcp2008145

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The Role of Ultraviolet Photons in Circumstellar Astrochemistry

T. J. Millar^,

Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK

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Corresponding author:
T. J. Millar, E-mail: Tom.Millar@qub.ac.uk
Received Date: August 16, 2020
Accepted Date: October 13, 2020
Issue Publish Date: December 26, 2020

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Abstract

Abstract

Stars with masses between 1 and 8 solar masses (M $_\odot$ ) lose large amounts of material in the form of gas and dust in the late stages of stellar evolution, during their Asymptotic Giant Branch (AGB) phase. Such stars supply up to 35 % of the dust in the interstellar medium and thus contribute to the material out of which our solar system formed. In addition, the circumstellar envelopes of these stars are sites of complex organic chemistry with over 80 molecules detected in them. We show that internal ultraviolet photons, either emitted by the star itself or from a close-in, orbiting companion, can significantly alter the chemistry that occurs in the envelopes particularly if the envelope is clumpy in nature. At least for the cases explored here, we find that in the presence of a stellar companion, such as a white dwarf star, the high flux of UV photons destroys H $_2$ O in the inner regions of carbon-rich AGB stars to levels below those observed and produces species such as C $^+$ deep in the envelope in contrast to the expectations of traditional descriptions of circumstellar chemistry.
- Astrochemistry,
- Stellar envelopes,
- Kinetic modelling

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References (66)

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