Computer Science – Performance
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..267v&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 90, June-July 1978, p. 267-274.
Computer Science
Performance
169
Chromosphere, Emission Spectra, H Lines, K Lines, Stellar Spectrophotometry, Absorption Spectra, Spectrophotometers, Statistical Analysis
Scientific paper
A four-channel photon-counting spectrophotometer (designated HKP-2) is described which is designed for measuring stellar chromospheric calcium emission. The HKP-2 is calibrated, and its performance and accuracy evaluated, by observing 63 of Wilson's (1968) program stars on the same nights with both the HKP-2 and a coude scanner designated HKP-1. The results of the observations are discussed in terms of the calibration of mean H-K flux indices, variations in individual stellar fluxes, the flux ratio for H and K, and the instrument color index. It is shown that the HKP-2 provides satisfactory performance in the measurement of stellar chromospheric emission in a manner closely analogous to the method of Wilson and that a single observation yields a color index as well as flux indices for H and K that can be calibrated and transferred unambiguously to Wilson's system of measurement.
Preston George W.
Vaughan Arthur Harris
Wilson Olin C.
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