ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water

Alain Baudry; Ka Tat Wong; Sandra Etoka; Anita M.S. Richards; Malcolm D. Gray; Fabrice Herpin; Taïssa Danilovich; Sofia Wallström; Leen Decin; Carl A. Gottlieb

doi:10.1017/S1743921323002442

ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water

Alain Baudry, Ka Tat Wong, Sandra Etoka, Anita M.S. Richards, Malcolm D. Gray, Fabrice Herpin, Taïssa Danilovich, Sofia Wallström, Leen Decin, Carl A. Gottlieb

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research

Abstract

ALMA observations with angular resolution in the range ∼20-200 mas demonstrate that emission at 268.149 and 262.898 GHz in the (0,2,0) and (0,1,0) vibrationally excited states of water are widespread in the inner envelope of O-rich AGB stars and red supergiants. These transitions are either quasi-thermally excited, in which case they can be used to estimate the molecular column density, or show signs of maser emission with a brightness temperature of ∼103-107 K in a few stars. The highest spatial resolution observations probe the inner few stellar radii environment, up to ∼10-12 R∗ in general, while the mid resolution data probe more thermally excited gas at larger extents. In several stars, high velocity components are observed at 268.149 GHz which may be caused by the kinematic perturbations induced by a companion. Radiative transfer models of water are revisited to specify the physical conditions leading to 268.149 and 262.898 GHz maser excitation.

Original language	English
Title of host publication	Proceedings of the International Astronomical Union
Subtitle of host publication	Volume 18, Pages 351 - 3557 December 2022
Editors	Tomoya Hirota, Hiroshi Imai, Ylva Pihlström, Karl Menten
Publisher	Cambridge University Press
Pages	351-355
Number of pages	5
Volume	18
Edition	S380
ISBN (Print)	9781009398923
DOIs	https://doi.org/10.1017/S1743921323002442
Publication status	Published - 7 Dec 2022

Publication series

Name	Proceedings of the International Astronomical Union
Publisher	Cambridge University Press
ISSN (Print)	1743-9213

Keywords

masers
radiation mechanisms: non-thermal
radiation mechanisms: thermal
stars: AGB and post-AGB
supergiants
techniques: interferometric

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10.1017/S1743921323002442Licence: CC BY-NC-ND

Cite this

Baudry, A., Wong, K. T., Etoka, S., Richards, A. M. S., Gray, M. D., Herpin, F., Danilovich, T., Wallström, S., Decin, L., & Gottlieb, C. A. (2022). ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water. In T. Hirota, H. Imai, Y. Pihlström, & K. Menten (Eds.), Proceedings of the International Astronomical Union: Volume 18, Pages 351 - 3557 December 2022 (S380 ed., Vol. 18, pp. 351-355). (Proceedings of the International Astronomical Union). Cambridge University Press. https://doi.org/10.1017/S1743921323002442

Baudry, Alain ; Wong, Ka Tat ; Etoka, Sandra et al. / ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water. Proceedings of the International Astronomical Union: Volume 18, Pages 351 - 3557 December 2022 . editor / Tomoya Hirota ; Hiroshi Imai ; Ylva Pihlström ; Karl Menten. Vol. 18 S380. ed. Cambridge University Press, 2022. pp. 351-355 (Proceedings of the International Astronomical Union).

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title = "ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water",

abstract = "ALMA observations with angular resolution in the range ∼20-200 mas demonstrate that emission at 268.149 and 262.898 GHz in the (0,2,0) and (0,1,0) vibrationally excited states of water are widespread in the inner envelope of O-rich AGB stars and red supergiants. These transitions are either quasi-thermally excited, in which case they can be used to estimate the molecular column density, or show signs of maser emission with a brightness temperature of ∼103-107 K in a few stars. The highest spatial resolution observations probe the inner few stellar radii environment, up to ∼10-12 R∗ in general, while the mid resolution data probe more thermally excited gas at larger extents. In several stars, high velocity components are observed at 268.149 GHz which may be caused by the kinematic perturbations induced by a companion. Radiative transfer models of water are revisited to specify the physical conditions leading to 268.149 and 262.898 GHz maser excitation.",

keywords = "masers, radiation mechanisms: non-thermal, radiation mechanisms: thermal, stars: AGB and post-AGB, supergiants, techniques: interferometric",

author = "Alain Baudry and Wong, {Ka Tat} and Sandra Etoka and Richards, {Anita M.S.} and Gray, {Malcolm D.} and Fabrice Herpin and Ta{\"i}ssa Danilovich and Sofia Wallstr{\"o}m and Leen Decin and Gottlieb, {Carl A.}",

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Baudry, A, Wong, KT, Etoka, S, Richards, AMS, Gray, MD, Herpin, F, Danilovich, T, Wallström, S, Decin, L & Gottlieb, CA 2022, ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water. in T Hirota, H Imai, Y Pihlström & K Menten (eds), Proceedings of the International Astronomical Union: Volume 18, Pages 351 - 3557 December 2022 . S380 edn, vol. 18, Proceedings of the International Astronomical Union, Cambridge University Press, pp. 351-355. https://doi.org/10.1017/S1743921323002442

ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water. / Baudry, Alain; Wong, Ka Tat; Etoka, Sandra et al.
Proceedings of the International Astronomical Union: Volume 18, Pages 351 - 3557 December 2022 . ed. / Tomoya Hirota; Hiroshi Imai; Ylva Pihlström; Karl Menten. Vol. 18 S380. ed. Cambridge University Press, 2022. p. 351-355 (Proceedings of the International Astronomical Union).

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research

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T1 - ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water

AU - Baudry, Alain

AU - Wong, Ka Tat

AU - Etoka, Sandra

AU - Richards, Anita M.S.

AU - Gray, Malcolm D.

AU - Herpin, Fabrice

AU - Danilovich, Taïssa

AU - Wallström, Sofia

AU - Decin, Leen

AU - Gottlieb, Carl A.

N1 - Publisher Copyright: © The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union.

PY - 2022/12/7

Y1 - 2022/12/7

N2 - ALMA observations with angular resolution in the range ∼20-200 mas demonstrate that emission at 268.149 and 262.898 GHz in the (0,2,0) and (0,1,0) vibrationally excited states of water are widespread in the inner envelope of O-rich AGB stars and red supergiants. These transitions are either quasi-thermally excited, in which case they can be used to estimate the molecular column density, or show signs of maser emission with a brightness temperature of ∼103-107 K in a few stars. The highest spatial resolution observations probe the inner few stellar radii environment, up to ∼10-12 R∗ in general, while the mid resolution data probe more thermally excited gas at larger extents. In several stars, high velocity components are observed at 268.149 GHz which may be caused by the kinematic perturbations induced by a companion. Radiative transfer models of water are revisited to specify the physical conditions leading to 268.149 and 262.898 GHz maser excitation.

AB - ALMA observations with angular resolution in the range ∼20-200 mas demonstrate that emission at 268.149 and 262.898 GHz in the (0,2,0) and (0,1,0) vibrationally excited states of water are widespread in the inner envelope of O-rich AGB stars and red supergiants. These transitions are either quasi-thermally excited, in which case they can be used to estimate the molecular column density, or show signs of maser emission with a brightness temperature of ∼103-107 K in a few stars. The highest spatial resolution observations probe the inner few stellar radii environment, up to ∼10-12 R∗ in general, while the mid resolution data probe more thermally excited gas at larger extents. In several stars, high velocity components are observed at 268.149 GHz which may be caused by the kinematic perturbations induced by a companion. Radiative transfer models of water are revisited to specify the physical conditions leading to 268.149 and 262.898 GHz maser excitation.

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KW - radiation mechanisms: non-thermal

KW - radiation mechanisms: thermal

KW - stars: AGB and post-AGB

KW - supergiants

KW - techniques: interferometric

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DO - 10.1017/S1743921323002442

M3 - Conference Paper

AN - SCOPUS:85185799602

SN - 9781009398923

VL - 18

T3 - Proceedings of the International Astronomical Union

SP - 351

EP - 355

BT - Proceedings of the International Astronomical Union

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PB - Cambridge University Press

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Baudry A, Wong KT, Etoka S, Richards AMS, Gray MD, Herpin F et al. ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water. In Hirota T, Imai H, Pihlström Y, Menten K, editors, Proceedings of the International Astronomical Union: Volume 18, Pages 351 - 3557 December 2022 . S380 ed. Vol. 18. Cambridge University Press. 2022. p. 351-355. (Proceedings of the International Astronomical Union). doi: 10.1017/S1743921323002442

ALMA explores the inner wind of evolved O-rich stars with two widespread vibrationally excited transitions of water

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