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Modelling the astronomical silicate features - I. On the spectrum subtraction method
Li, AG; Greenberg, JM; Zhao, G
2002-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume334Issue:4Pages:840-846
AbstractThe assumption of additive absorptivity by different components in compound particles is a widely used method applied in the literature to the analysis of the chemical and structural properties of astronomical (circumstellar, interstellar, protostellar and cometary) silicates as well as other materials. The errors intrinsic in this additivity assumption, which, in application to astronomical spectra, amounts in some cases to spectrum subtraction, have not always been adequately considered in previous works on silicate mineralogy. The failings in the 'spectrum subtraction method' (intrinsically the same as the additive absorptivity assumption) are discussed here in terms of silicate core-ice mantle grains with various shapes. It is shown that these assumptions result in substantial errors for spherical grains. For spheroidal grains, the errors are less significant and the spectrum subtraction method can be used to remove the ice mantle effects. It is demonstrated that there is no significant improvement by considering a distribution of spheroidal shapes. It is further shown that the presence of additional organic mantles substantially modifies the silicate mineralogy interpretation.
KeywordScattering Ism : Lines And bAnds Dust Infrared : Ism Extinction
Indexed BySCI
Language英语
WOS IDWOS:000177589800013
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8535
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Princeton Univ Observ, Princeton, NJ 08544 USA
3.Univ Arizona, Theoret Astrophys Program, Tucson, AZ 85719 USA
4.Leiden Univ, Raymond & Beverly Sackler Lab Astrophys, NL-2300 RA Leiden, Netherlands
Recommended Citation
GB/T 7714
Li, AG,Greenberg, JM,Zhao, G. Modelling the astronomical silicate features - I. On the spectrum subtraction method[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2002,334(4):840-846.
APA Li, AG,Greenberg, JM,&Zhao, G.(2002).Modelling the astronomical silicate features - I. On the spectrum subtraction method.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,334(4),840-846.
MLA Li, AG,et al."Modelling the astronomical silicate features - I. On the spectrum subtraction method".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 334.4(2002):840-846.
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