Far-ultraviolet extinction and diffuse interstellar bands |
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| Authors: | A. Megier,S. Aiello,B. Barsella,S. Casu,J. Kre&# owski |
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| Affiliation: | 1Center for Astronomy, N. Copernicus University, Gagarina 11, Pl-87-100 Toruń, Poland;2Dipartimento di Astronomia e Scienza dello Spazio, Universitàdi Firenze, Largo Fermi 5, 50125 Firenze, Italy;3Dipartimento di Fisica, Universitàdi Pisa, Piazza Torricelli 2, Pisa, Italy;4Osservatorio Astronomico di Cagliari, Strada n. 54, Loc. Poggio dei Pini, 09012 Capoterra (CA), Italy |
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| Abstract: | We relate the equivalent widths of the major diffuse interstellar bands (DIBs) near 5797 and 5780 Å with different colour excesses, normalized by E ( B − V ) , which characterize the growth of interstellar extinction in different wavelength ranges. It is demonstrated that the two DIBs correlate best with different parts of the extinction curve, and the ratio of these diffuse bands is best correlated with the far-ultraviolet (UV) rise. A number of peculiar lines of sight are also found, indicating that the carriers of some DIBs and the far-UV extinction can be separated in certain environments, e.g. towards the Per OB2 association. |
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| Keywords: | dust, extinction ISM: molecules |
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