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Hydrodynamical influence on the formation of HCN molecules

Tornow, Carmen and Kührt, Ekkehard and Motschmann, Uwe (2005) Hydrodynamical influence on the formation of HCN molecules. In: Astrochemistry: Recent Successes and Current Challenges. Poster Book, 231. IAU Symposium 231: Astrochemistry - Recent Successes and Current Challenges, 2005-08-29 - 2005-09-02, Asilomar Conference Grounds, Monterey, CA (USA).

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Official URL: http://asilomar.caltech.edu/index.php?mode=absviewhtml&abs_id=97

Abstract

HCN emission or absorption lines observed in the environment of low and high mass protostars indicate abundances relative to H2 which range from 10−9 to 10−6. These large variations are caused by the physical conditions in the surrounding envelope where the molecules are excited. In addition to the gaseous properties, the amount of UV radiation and the cosmic ray ionisation rate influence the formation efficiency of the HCN molecules. In order to study the impact of a temporally changing density and temperature a reduced chemical network derived from the UMIST data base (Le Teuff et al., 2000) is combined with different hydrodynamical models of a collapsing gas sphere. Using a very general initial element distribution (Markwick et al., 2000) the question is discussed whether a gas phase chemistry is able to reproduce the measured variability of the HCN abundances. Besides, we compare our conclusions concerning the influence of the infall time with the results published by Lintott et al. (2005).

Document Type:Conference or Workshop Item (Poster)
Title:Hydrodynamical influence on the formation of HCN molecules
Authors:
AuthorsInstitution or Email of Authors
Tornow, CarmenUNSPECIFIED
Kührt, EkkehardUNSPECIFIED
Motschmann, UweInstitute for Theoretical Physics, University Braunschweig
Date:2 September 2005
Journal or Publication Title:Astrochemistry: Recent Successes and Current Challenges. Poster Book
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:231
Series Name:IAU Symposium
Status:Published
Keywords:Hydrodynamic, Astrochemistry, Biomolecules
Event Title:IAU Symposium 231: Astrochemistry - Recent Successes and Current Challenges
Event Location:Asilomar Conference Grounds, Monterey, CA (USA)
Event Type:international Conference
Event Dates:2005-08-29 - 2005-09-02
Organizer:International Astronomical Union
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Dr.rer.nat. Carmen Tornow
Deposited On:07 Dec 2005
Last Modified:27 Apr 2009 04:45

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