THE MEAN PARALLAX OF EARLY-TYPE STARS OF DETERMINED PROPER MOTION AND APPARENT MAGNITUDE

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Abstract

In Lick Observatory Bulletin, 10, 135, 1922, anew determination of the mean parallax of stars of known proper motion and apparent magnitude was given for stars of spectral classes F, G, K and M. It was found later on1, that the formulae given there have some value even in the prediction of parallaxes for individual stars. It seems therefore desirable to derive the corresponding formulae for stars of spectral classes B and A, especially as it is only in recent years that trustworthy determinations of parallax for the highly luminous and distant stars of these classes have come within reach. It was assumed again that the absolute magnitude is linearly related to the quantity m + 5 -f5 log fi, where m is the apparent magnitude and fi the total annual proper motion, thus : tw+5+51ogw=^*+c(m-f5+51og/t*)or M=a+ c H (H was formerly called MaO

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