Calibration of the spectra of selected stars. I - VEGA

Details Calibration of the spectra of selected stars. I - VEGA Calibration of the spectra of selected stars. I - VEGA

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980sva....24..168k&link_type=abstract

(Astronomicheskii Zhurnal, vol. 57, Mar.-Apr. 1980, p. 287-295.) Soviet Astronomy, vol. 24, Mar.-Apr. 1980, p. 168-173. Transla

Astronomy and Astrophysics

Astronomy

4

Calibrating, Stellar Luminosity, Stellar Spectra, Accuracy, Brightness Temperature, Radiant Flux Density

Scientific paper

An absolute calibration of the spectrum of Vega in the 3200-7500 A wavelength range has been performed at the Astrophysical Institute in Alma-Ata. The spectrum was photoelectrically tied to the spectra of two ribbon-filament tungsten lamps (type SI 10-300U) calibrated in brightness temperature against the USSR Kelvin standard at the Mendeleev Institute of Metrology, Leningrad. Nikonov's method was used to correct the measurements for vertical atmospheric extinction. The optical depth of the air along the 217-m path from lamp to telescope was taken to be the sum of Rayleigh and aerosol components; the latter component was defined as a proportion of the vertical aerosol optical depth at the time of observation, according to the AFCRL model atmosphere. The spectral illuminance produced by Vega beyond the earth's atmosphere is tabulated in units of 0.003 erg/sq cm s. The rms error is 3% in the visible and 5.1% in the ultraviolet. Good agreement is found between the spectral illuminance curve for Vega and recent American calibrations.

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