Accession Number : AD0663179

Title :   FUNDAMENTAL DETERMINATION OF THE ABSOLUTE SPECTRAL ENERGY DISTRIBUTIONS OF STARS.

Descriptive Note : Annual rept., 1 Dec 66-30 Nov 67,

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : Oke,J. B.

Report Date : 1967

Pagination or Media Count : 8

Abstract : The purpose of the grant being reported on is to obtain an absolute calibration of the photometric system on which stellar brightnesses are reported. Observations comparing the brightness of alpha Lyrae with a standard lamp whose calibration is referred to the U.S. National Bureau of Standards have been made for the purpose of obtaining a preliminary calibration, and to provide a test for the optical and electronic equipment and computer program. Our results are in agreement with those of Hayes in showing that alpha Lyrae is fainter in the near infrared than had been previously assumed. If this infrared deficiency is confirmed by measurements of the platinum black body, it is evident that the scale of stellar effective temperatures will have to be revised. A second product of this project has been the determination of fluxes of many bright B- and A-type stars. Measurements of fluxes of about 30 stars were obtained during the late spring when the telescope and monochromator were being checked out. These data will be supplemented by data for fainter stars and clusters when the data system is completed.

Descriptors :   (*STARS, OPTICAL PROPERTIES), BRIGHTNESS, ULTRAVIOLET RADIATION, INFRARED RADIATION, BLACKBODY RADIATION, CALIBRATION, INSTRUMENTATION, TELESCOPES

Subject Categories : Astronomy

Distribution Statement : APPROVED FOR PUBLIC RELEASE