Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..449k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 449-457. NSERC-supported research.
Astronomy and Astrophysics
Astrophysics
18
Interstellar Extinction, Interstellar Matter, Optical Polarization, Ultraviolet Spectra, Absorption Spectra, B Stars, Diffuse Radiation, Far Ultraviolet Radiation, Grains, O Stars
Scientific paper
Central intensities of the 4430-A diffuse interstellar band (DIB) are obtained from reticon spectra of 128 early-type stars, and stars in the Perseus OB1 association are found to have higher ratios of polarization and weaker 4430-A intensities than do the stars in Cepheus OB3. The correlation noted for OB1 between the A(4430) residuals and E(15-18) can be explained if the 4430-A DIB arises in a thin grain mantle and the 2200-A feature arises in the grain core. The absence of a 4430-A DIB in high-Galactic-latitude clouds would then be due to a lack of mantle. The DIB ratio 5780/5797 A is found to resemble the behavior of the (4430-A)/E(B-V) ratio for seven stars from a range of Galactic latitudes, confirming the existence of three previously identified families of DIBs.
Grieve G. R.
Hill Grant Michael
Krelowski Jacek
Walker Gordon A. H.
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