Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64..179k&link_type=abstract
Astronomy and Astrophysics, vol. 64, no. 1-2, Mar. 1978, p. 179-193. Research supported by the Nederlandse Organisatie voor Zui
Astronomy and Astrophysics
Astronomy
29
Astronomical Photometry, Far Ultraviolet Radiation, Interstellar Extinction, Magellanic Clouds, Ultraviolet Photometry, Astronomical Netherlands Satellite, H Ii Regions, Hydrogen Ions, Stellar Luminosity, Stellar Magnitude, Ubv Spectra, Ultraviolet Astronomy
Scientific paper
Area-integrated ultraviolet observations made with the Netherlands Astronomical Satellite (ANS) of about 800 fields in a 0.7 square degree region around the giant H II region 30 Doradus in the Large Magellanic Cloud are discussed. The five-channel ANS photometric system is shown to be information-redundant in the present application: the LMC observations can be discussed in terms of only two parameters, i.e., the extrapolated visual brightness and a temperature parameter (color). A color-brightness diagram for about 600 fields with good quality measurements is given, and it is concluded that most of the spread in color is caused by differential extinction. By various independent methods it is found that the 2200 A-feature is deficient by a factor of three, on a logarithmic scale, relative to the average galactic extinction law.
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