Far-ultraviolet brightness of nebulae in Cygnus

Details Far-ultraviolet brightness of nebulae in Cygnus Far-ultraviolet brightness of nebulae in Cygnus

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205..397c&link_type=abstract

Astrophysical Journal, vol. 205, Apr. 15, 1976, pt. 1, p. 397-404. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

18

Far Ultraviolet Radiation, Nebulae, Ultraviolet Spectra, Apollo 16 Flight, Astronomical Spectroscopy, Brightness, H Ii Regions, Interstellar Extinction, Lunar Surface, O Stars, Schmidt Cameras, Spectrophotometry

Scientific paper

A far-ultraviolet electrographic Schmidt camera was operated on the lunar surface during the Apollo 16 mission. Among the results obtained were imagery in the 1050-1600-A and 1250-1600-A wavelength ranges of a 20-deg-diameter field in Cygnus containing the Cygnus Loop nebula, the North America nebula (NGC 7000), and the H II region of the O8 star 68 Cygni. The maximum intensity in the Cygnus Loop was 100 R in the 1250-1600-A range and 130 R in the 1050-1600-A range. The maximum brightnesses in the 1250-1600-A range of the 68 Cyg H II region and of NGC 7000 were about 60 and more than 80 R, respectively, but require relatively large corrections for interstellar extinction.

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