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Galactic longitude dependence of the intensity ratio of the diffuse interstellar absorption bands at λλ6180 and 4430
Authors:Mogens Rudkjøbing
Institution:(1) Ole Roemer Observatory, University of Aarhus, Denmark
Abstract:Equivalent widths, as published by Seddon, for the diffuse interstellar absorption band at lambda6180 are compared with photoelectric lambda4430 indices for ten stars in the northern Milky Way. The intensity ratio is found to depend on galactic longitude in a way similar to that found by Johnson for the ratioA V /E B–V of total to selective interstellar absorption.The dependence found, combined with deductions from a tentative identification of the bands as due to negative hydrogen, points to a direction for the galactic magnetic field that is in better agreement with the direction derived from rotation measures of extragalactic sources than with that based on the dust-hypothesis interpretation of interstellar optical polarization.
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