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Absolute flux measurements in the rocket ultraviolet (1974)

Bohlin, R. C. ; Frimout, D. ; Lillie, C. F.

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Publication Date: 2011-08-16

Description: A two-channel spectrometer was calibrated in the wavelength region 1200-3400 A and flown on an Aerobee rocket to observe the stars alpha Lyr, eta UMa, and zeta Oph. Standard tungsten lamps provided the absolute calibration down to 2250 A, and a photodiode calibrated by the National Bureau of Standards was the reference at shorter wavelengths. The molecular branching-ratio technique of relative calibration using the gases CO, NO, and N2 was a check on the absolute calibration. The flux from eta UMa agrees with the prediction of a hydrogen line blanketed model atmosphere within 10% between 1700 and 3400 A and within 4% over most of this wavelength region.

Keywords: INSTRUMENTATION AND PHOTOGRAPHY

Type: Astronomy and Astrophysics; 30; 1, Ja; Jan. 197

Format: text

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