Interstellar Extinction and Elemental Abundances
Zuo,Wenbo1,2,3; Li,Aigen3; Zhao,Gang1,2,3
Source PublicationThe Astrophysical Journal Supplement Series
AbstractAbstract Elements in the interstellar medium (ISM) exist in the form of gas or dust. The interstellar extinction and elemental abundances provide crucial constraints on the composition, size, and quantity of interstellar dust. Most of the extinction modeling efforts have assumed the total (gas and dust) abundances of the dust-forming elements—known as the “interstellar abundances,” “interstellar reference abundances,” or “cosmic abundances”—to be solar and the gas-phase abundances to be environmentally independent. However, it remains unclear whether the solar abundances are an appropriate representation of the interstellar abundances. Meanwhile, the gas-phase abundances are known to exhibit appreciable variations with local environments. Here we explore the viability of the abundances of B stars, the solar and protosolar abundances, and the protosolar abundances augmented by Galactic chemical enrichment (GCE) as an appropriate representation of the interstellar abundances by quantitatively examining the extinction and abundances of 10 interstellar sight lines for which both the extinction curves and the gas-phase abundances of all the major dust-forming elements (i.e., C, O, Mg, Si and Fe) have been observationally determined. Instead of assuming a specific dust model and then fitting the observed extinction curves, for each sight line we apply the model-independent Kramers–Kronig relation, which relates the wavelength-integrated extinction to the total dust volume, to place a lower limit on the dust depletion. This, together with the observationally derived gas-phase abundances, allows us to rule out the B-star, solar, and protosolar abundances as the interstellar reference standard and support the GCE-augmented protosolar abundances as a viable representation of the interstellar abundances.
KeywordGas-to-dust ratio Interstellar dust extinction Interstellar dust Cosmic abundances Interstellar abundances Solar abundances
WOS IDIOP:0067-0049-252-2-abcc6d
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorLi,Aigen
Affiliation1.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA;
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zuo,Wenbo,Li,Aigen,Zhao,Gang. Interstellar Extinction and Elemental Abundances[J]. The Astrophysical Journal Supplement Series,2021,252(2).
APA Zuo,Wenbo,Li,Aigen,&Zhao,Gang.(2021).Interstellar Extinction and Elemental Abundances.The Astrophysical Journal Supplement Series,252(2).
MLA Zuo,Wenbo,et al."Interstellar Extinction and Elemental Abundances".The Astrophysical Journal Supplement Series 252.2(2021).
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