LB 3459, an O-type subdwarf eclipsing binary system - II. New photometry and an improved analysis

1 May 1979

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

Vol. 187 (1) , 1-7
https://doi.org/10.1093/mnras/187.1.1

Abstract

Four-colour photometry of the short-period eclipsing binary system LB 3459 confirms features seen in earlier less-detailed data. An analysis of all the observational data suggests the system to be an O-type subdwarf plus a hot white dwarf rather than two sdO stars. A value of 0.03 is obtained for the linear limb-darkening coefficient of the primary and estimates of the absolute magnitudes of the two components give a distance of 70 ± 25 pc for the system. The primary and secondary may have radii as small as 0.04 R_⊙ and 0.02 R_⊙ respectively, indicating a component separation of only 0.25 R_⊙. Several unsolved problems connected with the nature and evolution of the LB 3459 system are noted.

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