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Infrared Michelson Interferometry of Zeta Aurigae Type Supergiants

Published online by Cambridge University Press:  30 March 2016

G. Paolo Di Benedetto  and
Steno Ferluga
G. Paolo Di Benedetto
Affiliation:
Inst. Cosmic Phys.(IFCTR), Via Bassini, 15, I 20133 Milano, Italy
Steno Ferluga
Affiliation:
Trieste Univ., Astronomy dept., Via Tiepolo, 11, I 34131 Trieste, Italy

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The system parameters of the ζ Aur-type binaries, all containing a cool supergiant and a hot dwarf, have been improved recently by IUE observations (N.P. Schroeder, 1985; A.Ap.147, 103). But the diameters of the supergiant components, determined with different indirect methods, are still discordant. We attempted to solve such discrepancies by measuring directly the angular sizes of these stars, expected to be of a few milli-arcseconds.