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OH/IR stars and their superwinds as observed by the Herschel Space Observatory

Justtanont, K; Teyssier, D; Barlow, MJ; Matsuura, M; Swinyard, B; Waters, LBFM; Yates, J; (2013) OH/IR stars and their superwinds as observed by the Herschel Space Observatory. Astronomy & Astrophysics , 556 , Article A101. 10.1051/0004-6361/201321812. Green open access

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Abstract

Aims. In order to study the history of mass loss in extreme OH/IR stars, we observed a number of these objects using CO as a tracer of the density and temperature structure of their circumstellar envelopes. / Methods. Combining CO observations from the Herschel Space Observatory with those from the ground, we trace mass loss rates as a function of radius in five extreme OH/IR stars. Using radiative transfer modelling, we modelled the dusty envelope as well as the CO emission. The high-rotational transitions of CO indicate that they originate in a dense superwind region close to the star while the lower transitions tend to come from a more tenuous outer wind which is a result of the mass loss since the early AGB phase. / Results. The models of the circumstellar envelopes around these stars suggest that they have entered a superwind phase in the past 200–500 years. The low 18O/17O (~0.1 compared to the solar abundance ratio of ~5) and 12C/13C (3–30 cf. the solar value of 89) ratios derived from our study support the idea that these objects have undergone hot-bottom burning and hence that they are massive M ≥ 5 M⊙ AGB stars.

Type: Article
Title: OH/IR stars and their superwinds as observed by the Herschel Space Observatory
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/201321812
Publisher version: https://doi.org/10.1051/0004-6361/201321812
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: stars: AGB and post-AGB / stars: mass-loss / submillimeter: stars
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10095256
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