Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..436j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 436-445.
Astronomy and Astrophysics
Astrophysics
71
Charge Coupled Devices, Diffuse Radiation, Interstellar Matter, Reflection Nebulae, Spectral Bands, Stellar Spectra, Molecular Clouds, Signal To Noise Ratios
Scientific paper
CCD spectra of 59 stars have been obtained in order to measure diffuse band strengths between 5690 and 5870 A. Most (37) off the stars are in reflection nebulae, and the rest are relatively unreddened comparison stars. The pixel spacing corresponds to 0.2 A, and the signal-to-noise (S/N) ratio ranges from 60 up to 600. Six diffuse bands are measurable in the data: 5705, 5778, 5780, 5797, 5844, and 5849 A. Based on the degree of correlation between the bands in pairs, as well as with E(B-V) and the 2175 A extinction bump, the bands can be divided into three groups. The first one consists of the narrow bands at 5780, 5797, and 5849 A. The second group contains the broad bands at 5778 and 5844 A, while 5705 A lies in between these groups in terms of correlation behavior. The second group correlates very badly with E(B-V), and the very broad 5778 A band is the only one that shows a very good correlation with the 2175 A bump.
Josafatsson Karl
Snow Theodore P.
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