I. McDonald
ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae
McDonald, I.; Zijlstra, A. A.; Lagadec, E.; Sloan, G. C.; Boyer, M. L.; Matsuura, M.; Smith, R. J.; Smith, C. L.; Yates, J. A.; van Loon, J. Th.; Jones, O. C.; Ramstedt, S.; Avison, A.; Justtanont, K.; Olofsson, H.; Blommaert, J. A. D. L.; Goldman, S. R.; Groenewegen, M. A. T.
Authors
A. A. Zijlstra
E. Lagadec
G. C. Sloan
M. L. Boyer
M. Matsuura
R. J. Smith
C. L. Smith
J. A. Yates
Jacobus Van Loon j.t.van.loon@keele.ac.uk
O. C. Jones
S. Ramstedt
A. Avison
K. Justtanont
H. Olofsson
J. A. D. L. Blommaert
S. R. Goldman
M. A. T. Groenewegen
Abstract
Atacama Large Millimetre Array observations show a non-detection of carbon monoxide around the four most luminous asymptotic giant branch (AGB) stars in the globular cluster 47 Tucanae. Stellar evolution models and star counts show that the mass-loss rates from these stars should be ∼1.2–3.5 × 10−7 M⊙ yr−1. We would naïvely expect such stars to be detectable at this distance (4.5 kpc). By modelling the ultraviolet radiation field from post-AGB stars and white dwarfs in 47 Tuc, we conclude that CO should be dissociated abnormally close to the stars. We estimate that the CO envelopes will be truncated at a few hundred stellar radii from their host stars and that the line intensities are about two orders of magnitude below our current detection limits. The truncation of CO envelopes should be important for AGB stars in dense clusters. Observing the CO (3–2) and higher transitions and targeting stars far from the centres of clusters should result in the detections needed to measure the outflow velocities from these stars.
Citation
McDonald, I., Zijlstra, A. A., Lagadec, E., Sloan, G. C., Boyer, M. L., Matsuura, M., …Groenewegen, M. A. T. (2015). ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae. Monthly Notices of the Royal Astronomical Society, 453(4), 4325-4337. https://doi.org/10.1093/mnras/stv1968
Journal Article Type | Article |
---|---|
Online Publication Date | Sep 17, 2015 |
Publication Date | Nov 11, 2015 |
Deposit Date | May 30, 2023 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 453 |
Issue | 4 |
Pages | 4325-4337 |
DOI | https://doi.org/10.1093/mnras/stv1968 |
Keywords | Space and Planetary Science; Astronomy and Astrophysics |
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