Observations of the very broad-band structure by combined UVBY and UBV photometry

Details Observations of the very broad-band structure by combined UVBY and UBV photometry Observations of the very broad-band structure by combined UVBY and UBV photometry

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.128...83r&link_type=abstract

(Universitaets-Sternwarte Jena, Jena Workshop on the Role of Dust in Dense Regions of Interstellar Matter, Georgenthal, East Ger

Astronomy and Astrophysics

Astrophysics

4

Broadband, Interstellar Extinction, Stellar Spectrophotometry, Ubv Spectra, B Stars, Open Clusters, Stellar Color, Ultraviolet Photometry

Scientific paper

The author discusses the papers of various authors which have observed the very broad-band structure (VBS) in the spectra of highly-reddened stars using different methods. It is possible to use the colour excess ratio E(b-y)/E(B-V) as a measure of the strength of the VBS. The author found that this ratio varies between 0.7 and 0.8 for intermediately and highly-reddened stars with observed VBS. He calibrated the colour excess ratio in terms of the central depth of the VBS. From the calibration stars and 13 reddened young open clusters containing more than 10 B-type stars he derived a relation between the central depth of the VBS and the reddening E(B-V) which is in good agreement with the results of van Breda and Whittet (1981) and supports the assumption that the VBS is a continuous phenomenon originating in solid grains.

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