elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

The chemistry of C<sub>2</sub> and C<sub>3</sub> in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances rh>2.9 AU

Helbert, Jörn and Rauer, Heike and Boice, Daniel C. and Huebner, Walter F. (2005) The chemistry of C<sub>2</sub> and C<sub>3</sub> in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances rh>2.9 AU. Astronomy and Astrophysics, 3 (442), pp. 1107-1120. DOI: 10.1051/0004-6361:20041571.

Full text not available from this repository.

Official URL: http://www.edpsciences.org/articles/aa/pdf/2005/42/aa1571-04.pdf?access=ok

Abstract

The extraordinary activity of comet C/1995 O1 (Hale-Bopp) made it possible to observe the emission bands of the radicals C<sub>2</sub> and C<sub>3</sub> in the optical wavelengths range at heliocentric distances larger than 3 AU. Based on these observations, we perform an analysis of the formation of C<sub>2</sub> and C<sub>3</sub> in a comet coma at large heliocentric distances.We present the most complete chemical reaction network used until today, computing the formation of C<sub>2</sub> and C<sub>3</sub> from C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>6</sub>, and C<sub>3</sub>H<sub>4</sub> as their parent molecules. The required photodissociation rates of C<sub>3</sub>H<sub>2</sub> and C<sub>3</sub> had to be derived based on the observations. The spatial distributions of C<sub>2</sub> and C<sub>3</sub> calculated with the chemical model show good agreement with the observations over the whole range of heliocentric distances covered in this work. Based on the production rates for C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>6</sub>, and C<sub>3</sub>H<sub>4</sub>, abundance ratios are obtained for heliocentric distances rh ≥ 3 AU. In comet Hale-Bopp, C<sub>2</sub>H<sub>2</sub> and C<sub>2</sub>H<sub>6</sub> were measured directly by infrared observations only at heliocentric distance rh ≤ 3 AU (Dello Russo et al. 2001). The model presented here greatly extends the heliocentric distance range over which hydrocarbons can be studied in the coma of comet Hale-Bopp. We discuss possible indications of these abundance ratios for the formation region of comet Hale-Bopp.

Document Type:Article
Title:The chemistry of C<sub>2</sub> and C<sub>3</sub> in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances rh>2.9 AU
Authors:
AuthorsInstitution or Email of Authors
Helbert, JörnUNSPECIFIED
Rauer, HeikeUNSPECIFIED
Boice, Daniel C.Southwest Research Institute, San Antonio, USA
Huebner, Walter F.Southwest Research Institute, San Antonio, USA
Date:2005
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:3
DOI:10.1051/0004-6361:20041571
Page Range:pp. 1107-1120
Status:Published
Keywords:comets: general – comets: individual: C/1995 O1 (Hale-Bopp) – planets and satellites: formation – interplanetary medium
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 > Planetary Physics
Deposited By: Barbara Stracke
Deposited On:06 Dec 2005
Last Modified:14 Jan 2010 20:12

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.