Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..211w&link_type=abstract
In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 211 (SEE N85-20961 11-89)
Astronomy and Astrophysics
Astronomy
Early Stars, Hot Stars, Interstellar Extinction, Ultraviolet Radiation, Clouds, Iue, Radiation Absorption
Scientific paper
The interstellar extinction in the UV was determined from IUE spectra for 29 reddened early-type stars by use of the pair method. The star sample was selected on the basis of highly deviant ratios of the strength of the 4430 A diffuse interstellar absorption feature to color excess E(B-V) (15 stars) and on the basis of association with reflection nebulae (9 stars). The incidence of peculiar extinction curves among this sample as measured by significant deviations from the mean galactic extinction law is near 70%. Deviations in the strength of the 2175 A extinction bump appear to occur independently of deviations in the rise of the far-UV extinction at 1250 A in about 35% of the stars. On the average, stars associated with dense interstellar clouds exhibit weaker UV extinction in the lambda 2500 A range than do stars observed through low-density diffuse clouds, if normalized to constant E(B-V). At 1250 A this difference between the averages of the two groups amounts to 27%, measured in units of the average galactic extinction per unit E(B-V) at 1250 A, but wide dispersions are evident for both groups.
Bohlin Ralph Charles
Stecher Theodore P.
Witt Adolf N.
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