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Herschel/HIFI observations of molecular lines from young planetary nebulae

Published online by Cambridge University Press:  30 August 2012

Valentín Bujarrabal ,
Miguel Santander-García ,
Javier Alcolea  and
Rebeca Soria
Valentín Bujarrabal
Affiliation:
Observatorio Astronómico Nacional, Ap. 112, E-28803 Alcalá de Henares, Spain email: [email protected]
Miguel Santander-García
Affiliation:
Observatorio Astronómico Nacional, Ap. 112, E-28803 Alcalá de Henares, Spain email: [email protected] Centro de Astrobiología, INTA-CSIC, Madrid, Spain; Instituto de Astrofsica de Canarias, Tenerife, Spain; and Dpto. de Astrofísica, Universidad de la Laguna, Tenerife, Spain
Javier Alcolea
Affiliation:
Observatorio Astronómico Nacional, C/Alfonso XII 3, E-28014 Madrid, Spain
Rebeca Soria
Affiliation:
Observatorio Astronómico Nacional, C/Alfonso XII 3, E-28014 Madrid, Spain
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Abstract

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We present results from systematic Herschel/HIFI observations of molecular lines in the FIR/sub-mm from young planetary nebulae. The high spectral resolution provided by the hetorodyne spectrometer HIFI allows properly studying the line profiles, whose structure corresponds to the various kinematics of the most massive nebular components, including fast bipolar outflows and slow shells. In particular, we have studied the excitation properties of the high-velocity (dense) flows. In some cases we find typical temperatures of the fast gas over 100-200 K, though in others it remains cool, ≲30K. We argue that the thermodynamics of the molecule-rich bipolar outflows is driven by fast radiative cooling, after the passage of the shock that accelerated it.

Keywords

planetary nebulae: generalstars: AGB and post-AGBsubmillimeter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 320 - 321
Copyright
Copyright © International Astronomical Union 2012

References

Alcolea, J., Bujarrabal, V., Soria-Ruiz, R., et al. 2012, A&A, in preparationGoogle Scholar
Bujarrabal, V., Alcolea, J., Soria-Ruiz, R., et al. 2010, A&A, 521, L3 Google Scholar
Bujarrabal, V., Alcolea, J., Soria-Ruiz, R., et al. 2012, A&A, 537, A8 Google Scholar