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Hydrodynamical influence on the formation of HCN and DCN in protostellar clouds

Tornow, Carmen and Kührt, Ekkehard and Motschmann, Uwe (2006) Hydrodynamical influence on the formation of HCN and DCN in protostellar clouds. 4th Planetary Formation Workshop, 2006-03-01 - 2006-03-03, Heidelberg.

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Official URL: http://www.mpia.de/PSF/PlanetWorkshop/index.php


HCN emission or absorption lines observed in the collapsing cloud around low and high mass protostars indicate abundances relative to H which range from 10<sup>-9</sup> to 10<sup>-7</sup>. These large variations are caused by the physical conditions of the molecular cloud. In addition to these properties, the cosmic ray ionisation rate influence the formation efficiency of the HCN molecules. In order to study the impact of a temporally changing gas density, velocity, and temperature a reduced chemical network derived from the UMIST data base is combined with a self similar hydrodynamical model of a collapsing gas sphere. Using a very general initial element distribution of a young molecular cloud the question is discussed whether a gas phase chemistry coupled to the ice phase is able to reproduce the HCN abundance and the DCN/HCN ratio observed in the vicinity of protostars. The differences between the calculated abundances of a hydrodynamical and a hydrostatic model are discussed as well.

Document Type:Conference or Workshop Item (Poster)
Title:Hydrodynamical influence on the formation of HCN and DCN in protostellar clouds
AuthorsInstitution or Email of Authors
Kührt, EkkehardUNSPECIFIED
Motschmann, UweTechnische Universität Braunschweig
Date:March 2006
Refereed publication:No
In ISI Web of Science:No
Keywords:Protostar, Hydrodynamic, Astrochemistry, HCN, Deuterium
Event Title:4th Planetary Formation Workshop
Event Location:Heidelberg
Event Type:international Conference
Event Dates:2006-03-01 - 2006-03-03
Organizer:Max Planck Institute for Astronomy and the University Heidelberg
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:26 Jun 2006
Last Modified:27 Apr 2009 12:56

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