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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F13%3A10191423%21RIV14-GA0-11320___
rdf:type
n5:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1088/0004-637X/776/1/25
dcterms:description
Absolute photodetachment cross sections of two anions of astrophysical importance CN- and C3N- were measured to be (1.18 +/- (0.03)(stat)(0.17)(sys)) x 10(-17) cm(2) and (1.43 +/- (0.14)(stat)(0.37)(sys)) x 10(-17) cm(2), respectively, at the ultraviolet (UV) wavelength of 266 nm (4.66 eV). These relatively large values of the cross sections imply that photodetachment can play a major role in the destruction mechanisms of these anions particularly in photon-dominated regions. We have therefore carried out model calculations using the newly measured cross sections to investigate the abundance of these molecular anions in the cirumstellar envelope of the carbon-rich star IRC+10216. The model predicts the relative importance of the various mechanisms of formation and destruction of these species in different regions of the envelope. UV photodetachment was found to be the major destruction mechanism for both CN- and C3N- anions in those regions of the envelope, where they occur in peak abundance. It was also found that photodetachment plays a crucial role in the degradation of these anions throughout the circumstellar envelope. Absolute photodetachment cross sections of two anions of astrophysical importance CN- and C3N- were measured to be (1.18 +/- (0.03)(stat)(0.17)(sys)) x 10(-17) cm(2) and (1.43 +/- (0.14)(stat)(0.37)(sys)) x 10(-17) cm(2), respectively, at the ultraviolet (UV) wavelength of 266 nm (4.66 eV). These relatively large values of the cross sections imply that photodetachment can play a major role in the destruction mechanisms of these anions particularly in photon-dominated regions. We have therefore carried out model calculations using the newly measured cross sections to investigate the abundance of these molecular anions in the cirumstellar envelope of the carbon-rich star IRC+10216. The model predicts the relative importance of the various mechanisms of formation and destruction of these species in different regions of the envelope. UV photodetachment was found to be the major destruction mechanism for both CN- and C3N- anions in those regions of the envelope, where they occur in peak abundance. It was also found that photodetachment plays a crucial role in the degradation of these anions throughout the circumstellar envelope.
dcterms:title
PHOTODETACHMENT AS A DESTRUCTION MECHANISM FOR CN- AND C3N- ANIONS IN CIRCUMSTELLAR ENVELOPES PHOTODETACHMENT AS A DESTRUCTION MECHANISM FOR CN- AND C3N- ANIONS IN CIRCUMSTELLAR ENVELOPES
skos:prefLabel
PHOTODETACHMENT AS A DESTRUCTION MECHANISM FOR CN- AND C3N- ANIONS IN CIRCUMSTELLAR ENVELOPES PHOTODETACHMENT AS A DESTRUCTION MECHANISM FOR CN- AND C3N- ANIONS IN CIRCUMSTELLAR ENVELOPES
skos:notation
RIV/00216208:11320/13:10191423!RIV14-GA0-11320___
n5:predkladatel
n14:orjk%3A11320
n3:aktivita
n21:I n21:P
n3:aktivity
I, P(GAP209/12/0233)
n3:cisloPeriodika
1
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n18:6512895
n3:druhVysledku
n20:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n9:predkladatel
n3:idSjednocenehoVysledku
96089
n3:idVysledku
RIV/00216208:11320/13:10191423
n3:jazykVysledku
n19:eng
n3:klicovaSlova
stars: carbon; stars: AGB and post-AGB; stars: abundances; circumstellar matter
n3:klicoveSlovo
n10:stars%3A%20AGB%20and%20post-AGB n10:stars%3A%20abundances n10:stars%3A%20carbon n10:circumstellar%20matter
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[EF2A9E13F26F]
n3:nazevZdroje
Astrophysical Journal
n3:obor
n13:BL
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
8
n3:projekt
n17:GAP209%2F12%2F0233
n3:rokUplatneniVysledku
n4:2013
n3:svazekPeriodika
776
n3:tvurceVysledku
Best, T. Roučka, Štěpán Hauser, D. Geppert, W. D. Kumar, S. S. Jindra, R. Millar, T. J. Wester, R.
n3:wos
000324989000025
s:issn
0004-637X
s:numberOfPages
6
n12:doi
10.1088/0004-637X/776/1/25
n16:organizacniJednotka
11320