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Detection of Rotational Co Emission from the Red-Supergiants in the Large Magellanic Cloud

M. Matsuura ; B. Sargent ; B. Swinyard ; J. A. Yates ; P. Royer ; M. J. Barlow ; M. L. Boyer ; L. Decin ; Theo Khouri (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. Meixner ; J. T. van Loon ; P. M. Woods
Physics of Evolved Stars: A Conference Dedicated to the Memory of Olivier Chesneau. Nice; France; 8 June 2015 through 12 June 2015 Vol. 71-72 (2015), p. 53-56.
[Konferensbidrag, refereegranskat]

It is yet well understood how mass-loss rates from evolved stars depend on metallicities. With a half of the solar metallicity and the distance of only 50 kpc, the evolved stars of the Large Magellanic Cloud (LMC) are an ideal target for studying mass loss at low metallicity. We have obtained spectra of red-supergiants in the LMC, using the Hershel Space Observatory, detecting CO thermal lines fro J=6-5 up to 15-14 lines. Modelling CO lines with non-LTE Radiative transfer code suggests that CO lines intensities can be well explained with high gas-to-dust ratio, with no obvious reduction in mass-loss rate at the LMC. We conclude that the luminosities of the stars are dominant factors on mass-loss rates, rather than the metallicity.

Denna post skapades 2016-03-16. Senast ändrad 2016-05-13.
CPL Pubid: 233314


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Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium


Astronomi, astrofysik och kosmologi

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