Royer, P;
Decin, L;
Wesson, R;
Barlow, MJ;
Polehampton, ET;
Matsuura, M;
Agúndez, M;
... Yates, JA; + view all
(2010)
PACS and SPIRE spectroscopy of the red supergiant VY CMa.
Astronomy and Astrophysics
, 518
, Article L145. 10.1051/0004-6361/201014641.
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Abstract
With a luminosity >105 L and a mass-loss rate of ∼2 × 10-4 M yr-1, the red supergiant VY CMa truly is a spectacular object. Because of its extreme evolutionary state, it could explode as supernova any time. Studying its circumstellar material, into which the supernova blast will run, provides interesting constraints on supernova explosions and on the rich chemistry taking place in such complex circumstellar envelopes. We have obtained spectroscopy of VY CMa over the full wavelength range offered by the PACS and SPIRE instruments of Herschel, i.e. 55-672 micron. The observations show the spectral fingerprints of more than 900 spectral lines, of which more than half belong to water. In total, we have identified 13 different molecules and some of their isotopologues. A first analysis shows that water is abundantly present, with an ortho-to-para ratio as low as ∼1.3:1, and that chemical non-equilibrium processes determine the abundance fractions in the inner envelope. © 2010 ESO.
| Type: | Article |
|---|---|
| Title: | PACS and SPIRE spectroscopy of the red supergiant VY CMa |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/201014641 |
| Publisher version: | https://doi.org/10.1051/0004-6361/201014641 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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/10095516 |
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