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

M. Matsuura ; B. Sargent ; B. Swinyard ; J. Yates ; P. Royer ; M. J. Barlow ; M. Boyer ; L. Decin ; Theo Khouri (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; M. Meixner ; J. T. van Loon ; P. M. Woods
Monthly Notices of the Royal Astronomical Society (0035-8711). Vol. 462 (2016), 3, p. 2995-3005.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: stars: AGB and post-AGB, circumstellar matter, stars: massive, stars: mass-loss, ISM: molecules, Magellanic Clouds



Denna post skapades 2016-10-28. Senast ändrad 2016-12-12.
CPL Pubid: 244417

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur

Onsala rymdobservatorium