Stellar Spectra in the Far Ultra-Violet

Details Stellar Spectra in the Far Ultra-Violet Stellar Spectra in the Far Ultra-Violet

Feb 1929

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1929natur.123..207r&link_type=abstract

Nature, Volume 123, Issue 3093, pp. 207 (1929).

Physics

1

Scientific paper

IN a letter to NATURE of Nov. 24, 1928, Cario suggested that in the region of arctic winter-night the 3000 A. barrier of stellar spectroscopy may be absent, leaving a clear view down to 2100 A., where absorption by ordinary oxygen molecules sets in. To test this idea I have made a trip to Honningsvåg, in northern Norway, the expenses being borne by the Government Research Fund of 1919. Honningsvåg is a small fishing-village in the vicinity of the North Cape (lat. 71°, long. 26° E. approximately). At this place the sun is constantly below the horizon from Nov. 20 to Jan. 23. I stayed there from Dec. 5 to Dec. 11. Being primarily interested in large-scale variations in the atmospheric transmission, I brought only a rather crude equipment, consisting of a small objective single prism quartz spectrograph equatorially mounted on tripod, with a 3-in. guiding telescope fitted with a hand-driven gear. The length of the spectrum obtained by this instrument is about 8 mm. from 5000 A. to 3000 A., and the dispersion at 3000 A. about 100 A. to a millimetre.

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