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Ethylene in the circumstellar envelope of IRC+10216

Published online by Cambridge University Press:  01 February 2008

K. H. Hinkle ,
L. Wallace ,
M. J. Richter  and
J. Cernicharo
K. H. Hinkle
Affiliation:
National Optical Astronomy ObservatoryP.O. Box 26732, Tucson, Arizona 85726, U.S.A. email: hinkle@noao.edu; wallace@noao.edu
L. Wallace
Affiliation:
National Optical Astronomy ObservatoryP.O. Box 26732, Tucson, Arizona 85726, U.S.A. email: hinkle@noao.edu; wallace@noao.edu
M. J. Richter
Affiliation:
University of California at DavisPhysics Department, 1 Shields Avenue, Davis, CA 95616, U.S.A. email: richter@physics.ucdavis.edu
J. Cernicharo
Affiliation:
Departamento de Astrofísica Molecular e InfrarrojaInstituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain email: cerni@damir.iem.csic.es
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Abstract

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Ethylene (C2H4) is a symmetric molecule that is best detected using mid-infrared transitions. We report on observations of the 10.5 μm ν7 band using the cryogenic grating spectrograph TEXES. These confirm the previous ethylene detection in the IRC+10216 circumstellar shell. We detect 18 ethylene lines. The lines are both narrow and weak with depths of no more than ~2%. The ethylene lines suggest an excitation temperature of ~80 K.

Keywords

Techniques: spectroscopicstars: carboncircumstellar matterISM: moleculesinfrared: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 161 - 162
Copyright
Copyright © International Astronomical Union 2008

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