The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud
Journal article, 2016

Using the PACS and SPIRE spectrometers on-board the Herschel Space Observatory, we obtained spectra of two red supergiants (RSGs) in the Large MagellanicCloud (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 x 10(-4) M-circle dot yr(-1). The model assumes a gas-to-dust ratio and a CO-to-H-2 abundance ratio is estimated from the Galactic values scaled by the LMC metallicity ([Fe/H] similar to -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.

stars: AGB and post-AGB

circumstellar matter

Magellanic Clouds

stars: mass-loss

ISM: molecules

stars: massive

Author

M. Matsuura

University College London (UCL)

Cardiff University

B. Sargent

Rochester Institute of Technology

B. Swinyard

Rutherford Appleton Laboratory

University College London (UCL)

J. A. Yates

University College London (UCL)

P. Royer

KU Leuven

M. J. Barlow

University College London (UCL)

M. Boyer

NASA Goddard Space Flight Center

L. Decin

KU Leuven

Anton Pannekoek Institute for Astronomy

Theo Khouri

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

M. Meixner

Johns Hopkins University

Space Telescope Science Institute (STScI)

J. T. van Loon

Keele University

P. M. Woods

Queen's University Belfast

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 462 3 2995-3005 stw1853

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

Infrastructure

Onsala Space Observatory

DOI

10.1093/mnras/stw1853

More information

Latest update

9/6/2018 7