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The 2175 Å interstellar extinction bump: is the wavelength variable?
- Source :
-
Monthly Notices of the Royal Astronomical Society . 10/15/2023, Vol. 525 Issue 1, p983-993. 11p. - Publication Year :
- 2023
-
Abstract
- The most striking characteristics of the mysterious 2175 |$\mathring{\rm A}$| extinction bump, the strongest spectroscopic absorption feature seen on the interstellar extinction curve, are the invariant central wavelength and variable bandwidth: its peak position at 2175 |$\mathring{\rm A}$| is remarkably constant, while its bandwidth varies from one line of sight to another. However, recent studies of the lines of sight towards a number of Herbig Ae/Be stars have revealed that the extinction bump exhibits substantial shifts from the canonical wavelength of 2175 |$\mathring{\rm A}$|. In this work, we revisit these lines of sight and take a physical approach to determine the ultraviolet (UV) extinction curve for each line of sight. It is found that the wavelengths of the derived UV extinction bumps are around 2200 |$\mathring{\rm A}$| and the scatters are considerably smaller than those of the previous study based on the same set of Herbig Ae/Be stars, consistent with the conventional wisdom of a stable bump position. Nevertheless, the scatters are still appreciably larger than those associated with the nominal bump position of 2175 |$\mathring{\rm A}$|. This is discussed in the context that Herbig Ae/Be stars are not well suited for interstellar extinction studies. [ABSTRACT FROM AUTHOR]
- Subjects :
- *INTERSTELLAR reddening
*WAVELENGTHS
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 525
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 171106807
- Full Text :
- https://doi.org/10.1093/mnras/stad2352