Abstract
ACCURATE measurements of the wavelength dependence of interstellar obscuration in the spectral range from 10,000 A to 3400 A (refs. 1–4) show a distinct change in the slope of the extinction curve at 4300 A. Extinction observations have been made for a number of galactic regions, and it is found that a change in slope always occurs at 4300 A but that the magnitude of the change differs significantly from one region to another. At the same time, an unidentified interstellar band of half-width approximately 20 A appears at 4430 A, but the discontinuity in the slope of the extinction curve does not affect the profile of this band5.
Full Text 
Sign-in/Register to access full text options
Sign-in/Register to access full text options 
Published version (
Free)
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
