Astronomy and Astrophysics – Astronomy
Scientific paper
May 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974mmsai..45..223n&link_type=abstract
(Ministero della Pubblica Istruzione, CNR, and Universita di Trieste, European Regional Meeting in Astronomy, 2nd, Trieste, Ital
Astronomy and Astrophysics
Astronomy
Early Stars, Interstellar Extinction, Satellite Observation, Stellar Radiation, Ultraviolet Radiation, Cosmic Dust, Cygnus Constellation, Galactic Structure, Interstellar Matter, Line Spectra, Main Sequence Stars, Spaceborne Astronomy, Stellar Luminosity, Td-1 Satellite
Scientific paper
Ultraviolet extinction curves derived from observations of over 100 stars distributed in widely separated galactic regions do not show strong longitude dependence. They all exhibit a strong absorption band centered at about 2180 A. Observations of this band give an equivalent width of about 45 A per kpc. The mean profile of this band, derived from ultraviolet spectra of reddened stars, is found to be highly symmetric with a half width of 320 A. The symmetrical nature of such a strong band suggests that it is caused by particles which are small with respect to wavelength of light. For graphites, the number density required to produce the observed equivalent width of 45 A per kpc would be 10 to the -11th power per cu cm.
Jamar Claude
Monfils A.
Nandy K.
Thompson G. I.
Wilson Raymond
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