Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

PACS and SPIRE spectroscopy of the red supergiant VY CMa [Letter]

Royer, P., Decin, L., Wesson, R., Barlow, M. J., Polehampton, E. T., Matsuura, Mikako, Agúndez, M., Blommaert, J. A. D. L., Cernicharo, J., Cohen, M., Daniel, F., Degroote, P., De Meester, W., Exter, K., Feuchtgruber, H., Gear, Walter Kieran, Gomez, Haley Louise, Groenewegen, M. A. T., Hargrave, Peter Charles, Huygen, R., Imhof, P., Ivison, R. J., Jean, C., Kerschbaum, F., Leeks, S. J., Lim, T., Lombaert, R., Olofsson, G., Posch, T., Regibo, S., Savini, G., Sibthorpe, B., Swinyard, B. M., Vandenbussche, B., Waelkens, C., Witherick, D. K. and Yates, J. A. 2010. PACS and SPIRE spectroscopy of the red supergiant VY CMa [Letter]. Astronomy and Astrophysics 518 , L145. 10.1051/0004-6361/201014641

[img]
Preview
PDF
Download (214kB) | Preview

Abstract

With a luminosity >105  and a mass-loss rate of ~2 × 10-4  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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: line: identification / stars: chemically peculiar / circumstellar matter / stars: mass-loss / supergiants
Publisher: EDP Sciences
ISSN: 0004-6361
Last Modified: 04 Jun 2017 03:31
URI: http://orca.cf.ac.uk/id/eprint/22243

Citation Data

Cited 14 times in Google Scholar. View in Google Scholar

Cited 24 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics