Matsuura, M, Sargent, B, Swinyard, B, Yates, J, Royer, P, Barlow, MJ, Boyer, M, Khouri, T, Meixner, M, van Loon, JT and Woods, P (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). 2995 - 3005. ISSN 0035-8711

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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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © The Author 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society.
Uncontrolled Keywords: stars, AGB and post-AGB, circumstellar matter, massive, mass-loss, ISM, molecules, magellanic clouds
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Depositing User: Symplectic
Date Deposited: 24 Nov 2016 08:59
Last Modified: 05 Apr 2019 10:56

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