Matsuura, M;
Sargent, B;
Swinyard, B;
Yates, J;
Royer, P;
Barlow, MJ;
Boyer, M;
... Woods, PM; + view all
(2016)
The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud.
Monthly Notices of the Royal Astronomical Society
, 462
(3)
pp. 2995-3005.
10.1093/mnras/stw1853.
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Abstract
Using the PACS and SPIRE spectrometers on-board the Herschel Space Observatory, we obtained spectra of two red supergiants (RSGs) in the Large Magellanic Cloud (LMC). Multiple rotational CO emission lines (J = 6–5 to 15-14) and 15 H2O lines were detected from IRAS 05280−6910, and one CO line was detected from WOH G64. This is the first time that CO rotational lines have been detected from evolved stars in the LMC. Their CO line intensities are as strong as those of the Galactic RSG, VY CMa. Modelling the CO lines and the spectral energy distribution results in an estimated mass-loss rate for IRAS 05280−6910 of 3 × 10−4 M⊙ yr−1. The model assumes a gas-to-dust ratio and a CO-to-H2 abundance ratio is estimated from the Galactic values scaled by the LMC metallicity ([Fe/H] ∼ −0.3), i.e. that the CO-to-dust ratio is constant for Galactic and LMC metallicities within the uncertainties of the model. The key factor determining the CO line intensities and the mass-loss rate found to be the stellar luminosity.
| Type: | Article |
|---|---|
| Title: | The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stw1853 |
| Publisher version: | https://doi.org/10.1093/mnras/stw1853 |
| Language: | English |
| Additional information: | © 2017 The Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Stars: AGB And Post-AGB, Circumstellar Matter, Stars: Massive, Stars: Mass-Loss, ISM: Molecules, Magellanic Clouds, Asymptotic Giant Branch, VY-Canis-Majoris, Herschel-Spire Instrument, Evolved Stars, AGB Stars, Circumstellar Dust, Radiative-Transfer, Supernova Remnant, Line-Profiles, Effective Temperature |
| UCL classification: | UCL 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/1509207 |
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