Large molecules in the envelope surrounding IRC+10216

T. J. Millar; E. Herbst; R. P.A. Bettens

doi:10.1046/j.1365-8711.2000.03560.x

Large molecules in the envelope surrounding IRC+10216

T. J. Millar^*, E. Herbst, R. P.A. Bettens

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

133 Citations (Scopus)

Abstract

A new chemical model of the circumstellar envelope surrounding the carbon-rich star IRC+10216 is developed that includes carbon-containing molecules with up to 23 carbon atoms. The model consists of 3851 reactions involving 407 gas-phase species. Sizeable abundances of a variety of large molecules - including carbon clusters, unsaturated hydrocarbons and cyanopolyynes - have been calculated. Negative molecular ions of chemical formulae C^-_n and C_nH^- (7 ≤ n ≤ 23) exist in considerable abundance, with peak concentrations at distances from the central star somewhat greater than their neutral counterparts. The negative ions might be detected in radio emission, or even in the optical absorption of background field stars. The calculated radial distributions of the carbon-chain C_nH radicals are looked at carefully and compared with interferometric observations.

Original language	English
Pages (from-to)	195-203
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	316
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.2000.03560.x
Publication status	Published - 21 Jul 2000

Access to Document

10.1046/j.1365-8711.2000.03560.x

Cite this

@article{03157cd8469749ca94604cbdb5828461,

title = "Large molecules in the envelope surrounding IRC+10216",

abstract = "A new chemical model of the circumstellar envelope surrounding the carbon-rich star IRC+10216 is developed that includes carbon-containing molecules with up to 23 carbon atoms. The model consists of 3851 reactions involving 407 gas-phase species. Sizeable abundances of a variety of large molecules - including carbon clusters, unsaturated hydrocarbons and cyanopolyynes - have been calculated. Negative molecular ions of chemical formulae C-n and CnH- (7 ≤ n ≤ 23) exist in considerable abundance, with peak concentrations at distances from the central star somewhat greater than their neutral counterparts. The negative ions might be detected in radio emission, or even in the optical absorption of background field stars. The calculated radial distributions of the carbon-chain CnH radicals are looked at carefully and compared with interferometric observations.",

keywords = "Circumstellar matter, ISM: Molecules, Molecular data, Molecular processes, Stars: individual: IRC+10216",

author = "Millar, {T. J.} and E. Herbst and Bettens, {R. P.A.}",

year = "2000",

month = jul,

day = "21",

doi = "10.1046/j.1365-8711.2000.03560.x",

language = "English",

volume = "316",

pages = "195--203",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

TY - JOUR

T1 - Large molecules in the envelope surrounding IRC+10216

AU - Millar, T. J.

AU - Herbst, E.

AU - Bettens, R. P.A.

PY - 2000/7/21

Y1 - 2000/7/21

N2 - A new chemical model of the circumstellar envelope surrounding the carbon-rich star IRC+10216 is developed that includes carbon-containing molecules with up to 23 carbon atoms. The model consists of 3851 reactions involving 407 gas-phase species. Sizeable abundances of a variety of large molecules - including carbon clusters, unsaturated hydrocarbons and cyanopolyynes - have been calculated. Negative molecular ions of chemical formulae C-n and CnH- (7 ≤ n ≤ 23) exist in considerable abundance, with peak concentrations at distances from the central star somewhat greater than their neutral counterparts. The negative ions might be detected in radio emission, or even in the optical absorption of background field stars. The calculated radial distributions of the carbon-chain CnH radicals are looked at carefully and compared with interferometric observations.

AB - A new chemical model of the circumstellar envelope surrounding the carbon-rich star IRC+10216 is developed that includes carbon-containing molecules with up to 23 carbon atoms. The model consists of 3851 reactions involving 407 gas-phase species. Sizeable abundances of a variety of large molecules - including carbon clusters, unsaturated hydrocarbons and cyanopolyynes - have been calculated. Negative molecular ions of chemical formulae C-n and CnH- (7 ≤ n ≤ 23) exist in considerable abundance, with peak concentrations at distances from the central star somewhat greater than their neutral counterparts. The negative ions might be detected in radio emission, or even in the optical absorption of background field stars. The calculated radial distributions of the carbon-chain CnH radicals are looked at carefully and compared with interferometric observations.

KW - Circumstellar matter

KW - ISM: Molecules

KW - Molecular data

KW - Molecular processes

KW - Stars: individual: IRC+10216

UR - http://www.scopus.com/inward/record.url?scp=0001436040&partnerID=8YFLogxK

U2 - 10.1046/j.1365-8711.2000.03560.x

DO - 10.1046/j.1365-8711.2000.03560.x

M3 - Article

SN - 0035-8711

VL - 316

SP - 195

EP - 203

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Large molecules in the envelope surrounding IRC+10216

Abstract

Access to Document

Other files and links

Fingerprint

Cite this