General Transformation Factor from Number of Stars of Tenth Visual Magnitude to Raleigh Per Angstrom Or Nano Lambert for Different Wavelengths

Author: Nawar S.   Morcos A.B.  

Publisher: Springer Publishing Company

ISSN: 0004-640X

Source: Astrophysics and Space Science, Vol.253, Iss.1, 1997-01, pp. : 1-5

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Abstract

A general transformation function F(λ) from S_10(λ) to RÅ or nl is obtained, by using three equations published by Lienert et al. (1995). Massey et al. (1990) and Garstang (1986), which are converting the sky brightness from S_10 (κ) units, R/Å and nl to mag/sec^2. The transformation function is inversely proportion to wavelength: i.e. it takes the form F(λ) =f λ^-1. The coefficient f is found to be equal 23.23 for all wavelengths. A set of different values of F(λ) is obtained for the different wavelengths. The present value of F(λ) at λ= 5300 Å confirms, the value obtained by Roach (1973) at the same wavelength.