Results 181 to 190 of about 944,715 (218)

The origin of unidentified interstellar absorption lines

, 1939
Swings, Polydore, Öhman, Y.
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Interstellar absorption lines in the ultraviolet

, 1974
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Interstellar Silicate Absorption Bands

Nature, 1970
Interstellar silicate absorption is observed in the direction of the galactic centre. Most interstellar silicon seems to be in silicate form.
Robert Gehrz
exaly   +3 more sources

Identification of the λ2, 200Å interstellar absorption feature

Nature, 1977
A BROAD absorption feature centred on λ2, 200A with a half-width of ∼ 300A appears in the spectra of reddened stars1–3. This conspicuous feature in the interstellar extinction curve, might hold an important clue to the identity of a major component of interstellar matter, but it has defied identification for over a decade. Here we identify this band as
F. Hoyle, N. C. Wickramasinghe
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Diffuse interstellar absorption bands

Science in China Series G: Physics, Mechanics and Astronomy, 2009
The diffuse interstellar bands (DIBs) are a large number of absorption bands that are superposed on the interstellar extinction curve and are of interstellar origin. Since the discovery of the first two DIBs in the 1920s, the exact nature of DIBs still remains unclear.
FuYuan Xiang, ShunLin Liang, AiGen Li
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Interstellar absorption in the galactic plane

Astrophysics, 1994
UDC 524.5 We consider the distribution of interstellar absorption in the galactic plane using the classical Cepheids and main sequence stars of spectral classes B0-B3. In the method developed we use pairs of stars with the same absolute stellar magnitude, but with maximal difference of observed colors (B-V), The observed picture corresponds to the ...
R. A. Vardanyan, V. V. Ambaryan, A. V. Pogosyan   +2 more
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Interstellar Extinction and Diffuse Absorption Features

Astrophysics and Space Science, 1975
The equivalent width of the λ 2175 A band, W 2175, well known as the big bump in the interstellar extinction curves, has been found to be closely correlated with the colour excess E B-V as well as with the extinction differences E 8−6 and E 8−6 defined to characterize quantitatively the steep slopes of the extinction curves in the far ultraviolet.
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The shape of the interstellar absorption band

Astrophysics and Space Science, 1970
Profiles of the 4430 band are calculated for resonant absorbers distributed within graphite particles, silicate particles and solid H2 grains. The sizes of grains adopted are those which give agreement with the interstellar extinction. Only in the latter two cases can satisfactory agreement be obtained with recent observational data.
N. C. Wickramasinghe, K. Nandy
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Distribution of stars and interstellar absorption

Vistas in Astronomy, 1962
Abstract The paper is a continuation of two earlier papers concerning the effect of interstellar absorption on the investigation of stellar distribution. It presents a considerable simplification of the formulae developed earlier, and leads not only to the tabulation of arguments but also, in turn, to the construction of tables which can be compared ...
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Diffuse interstellar absorption and emission bands

AIP Conference Proceedings, 1994
Unidentified astrophysical spectra are discussed including the diffuse interstellar absorption bands and visible emission bands from the Red Rectangle nebula and the R Coronae Borealis star V854 Cen. Assignments for the Red Rectangle optical emision and complementary diffuse absorption bands are not yet established, but comparison of the spectra allows
R. E. Hibbins, J. R. Miles, P. J. Sarre
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