Cepheid Variables and Galactic Absorption

Open Access

1 August 1957

journal article
Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society

Vol. 117 (4) , 430-444
https://doi.org/10.1093/mnras/117.4.430

Abstract

From a discussion of the colours and magnitudes of galactic and Magellanic Cloud cepheid variables, we have : (1) derived a reddening of +0 ^m .11 for δ Cephei and +0 ^m .08 for α Ursae Minoris from the colours and spectral types of their visual companions ; (2) found similar values for the reddening of these bright cepheids by spectrophotometric comparisons with F- and G-type supergiants; (3) determined, from the proper motions of the brighter galactic cepheids; a correction of –1 ^m .7 for the zero point of Shapley's period-luminosity relation; (4) derived the value 17.5±1.9 km/sec/kpc for the rotation constant A and (5) discussed the large values of the mean absorption in the galactic plane that are derived from the assumption that the galactic and Magellanic Cloud cepheids have the same intrinsic colour.

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