YNAO OpenIR  > 大样本恒星演化研究组
Interstellar chemical differentiation across grain sizes
Ge JX(葛继兴)1,2; He JH(何金华)1,3; Li, Aigen4
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-07-21
Volume460Issue:1Pages:L50-L54
DOI10.1093/mnrasl/slw058
Contribution Rank第1完成单位
Indexed BySCI
Keywordastrochemistry ISM: abundances ISM: clouds dust, extinction
Abstract

In this work, we investigate the effects of ion accretion and size-dependent dust temperatures on the abundances of both gas-phase and grain-surface species. While past work has assumed a constant areal density for icy species, we show that this assumption is invalid and the chemical differentiation over grain sizes is significant. We use a gas-grain chemical code to demonstrate this numerically for two typical interstellar conditions: a dark cloud (DC) and a cold neutral medium (CNM). It is shown that, although the grain-size distribution variation (but with the total grain surface area unchanged) has little effect on the gas-phase abundances, it can alter the abundances of some surface species by up to similar to 2-4 orders of magnitude. The areal densities of ice species are larger on smaller grains in the DC model as a consequence of ion accretion. However, the surface areal density evolution tracks are more complex in the CNM model due to the combined effects of ion accretion and dust temperature variation. The surface areal density differences between the smallest (similar to 0.01 mu m) and the biggest (similar to 0.2 mu m) grains can reach similar to 1 and similar to 5 orders of magnitude in the DC and CNM models, respectively.

Funding ProjectNational Natural Science Foundation of China (NSFC)[11173056] ; academic leader talent plan of Guan-du district of Kunming ; National Science Foundation (NSF)[AST-1311804] ; National Science Foundation (NSF)[NNX13AE63G]
Funding OrganizationNational Natural Science Foundation of China (NSFC)[11173056] ; academic leader talent plan of Guan-du district of Kunming ; National Science Foundation (NSF)[AST-1311804, NNX13AE63G]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
Archive Date2016-12-30
WOS IDWOS:000379832000011
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMONTE-CARLO TREATMENT ; RATE-EQUATIONS ; ICE MANTLES ; GAS ; CHEMISTRY ; SIMULATIONS ; MODEL ; DUST ; CLOUDS ; DISTRIBUTIONS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9619
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorGe JX(葛继兴)
Affiliation1.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, PO Box 110, Kunming, 650011, Yunnan Province, China
2.University of the Chinese Academy of Sciences, Yuquan Road 19, Shijingshan Block, 100049, Beijing, China
3.Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA) at Cerro Calán, Camino El Observatorio 1515, Las Condes, Santiago, Chile
4.Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ge JX,He JH,Li, Aigen. Interstellar chemical differentiation across grain sizes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(1):L50-L54.
APA Ge JX,He JH,&Li, Aigen.(2016).Interstellar chemical differentiation across grain sizes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(1),L50-L54.
MLA Ge JX,et al."Interstellar chemical differentiation across grain sizes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.1(2016):L50-L54.
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