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The interstellar extinction curve from 4000 Å to 6500 Å

Published online by Cambridge University Press:  14 August 2015

G. A. H. Walker ,
J. B. Hutchings  and
P. F. Younger
G. A. H. Walker
Affiliation:
Geophysics Dept., University of British Columbia, Vancouver, B.C., Canada
J. B. Hutchings
Affiliation:
Dominion Astrophysical Observatory, Victoria, B. C., Canada
P. F. Younger
Affiliation:
Dominion Astrophysical Observatory, Victoria, B. C., Canada

Abstract

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Interstellar extinction curves (mext vs. 1/λ) of 20 Å resolution have been obtained at the DAO from photoelectric scanner observations in the range 4000 Å to 5000 Å for five stars, and of 50 Å resolution for four stars in the range 4000 Å to 6500 Å from Willstrop's photoelectric data. There is a closely linear section between 4900 Å and 5800 Å for all of the curves. There are changes of gradient or discontinuities associated with the broadest diffuse interstellar bands at 6180 Å, 4882 Å, 4761 Å and 4430 Å. There is a marked discontinuity near 5800 Å and for some stars a broad absorption near 4200 Å. The 4430 Å band lies between two unequal wings of anomalously low extinction (one of which has been detected at Edinburgh). The irregularities vary from star to star, and those in the neighbourhood of the 4430 Å band seem to have the same form as those in the region of the absorption peak at 2200 Å

Type
Part I: Stellar Fluxes
Information
Symposium - International Astronomical Union , Volume 36: Ultraviolet Stellar Spectra and Related Ground-Based Observations , 1970 , pp. 52 - 56
Copyright
Copyright © Reidel 1970 

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