DIBs, Interstellar Dust, and Extinction. Issue Volume 9:Issue S297(2013) (21st February 2014)

• Record Type: Journal Article
• Authors: Clayton, G. C.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 9:Issue S297(2013)
• Page Start: 147
• Page End: 152
• Publication Date: 2014-02-21
• Subjects: dust, -- diffuse interstellar bands, -- extinction; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921313015780
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: The relationship between DIBs and dust is still unknown. The correlation between reddening and DIB strength means that the DIBs are mixed in with the dust and gas in interstellar clouds. The DIBs are relatively stronger in the diffuse interstellar medium than in dense clouds. There is only a weak correlation between the DIBs and the UV extinction parameters including the 2175 Å bump strength and the far-UV rise. In addition, the bump dust grains are sometimes polarized, while the DIBs are not. However, observations of DIBs in the SMC show that when the 2175 Å bump is weak or missing so are the DIBs. Two of the four sightlines that deviate strongly from the CCM UV extinction in the Galaxy show weak DIBs.