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HD 46407: The First Eclipsing-Binary Barium Star

Published online by Cambridge University Press:  07 August 2017

A. Jorissen ,
J. Manfroid  and
C. Sterken
A. Jorissen
Affiliation:
1European Southern Observatory, Garching bei München, Germany
J. Manfroid
Affiliation:
2Institut d'Astrophysique, Université de Liège, Belgium
C. Sterken
Affiliation:
3Astrophysical Institute, University of Brussels (VUB), Belgium

Abstract

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A long-term, high-accuracy, differential uvby monitoring of a sample of 19 barium stars revealed that HD 46407, a well known barium star with an orbital period of 458 d, is an eclipsing binary. The eclipse (of the companion by the barium star) was most clearly seen in November 1988, when a dip of 0.02 mag (in y) having a FWHM of about 10 d was recorded in the lightcurve. Confirmation of the eclipsing nature of HD 46407 was also obtained in February 1985 and in February 1990. A shallow secondary eclipse (extending over about 50% of the orbital period) seems to be present as well. The b – y index is marginally variable, while v – b color variations are correlated with the y variations, in the sense that the system appears redder when it is fainter. We suggest that these variations originate in the scattering of the red-giant light by dust particles trapped (in a wide ring or shell?) around the (compact) companion. The eclipsed light would then be the light of the red giant backscattered by the dust around the companion.

Type
Oral and Contributed Papers
Information
Symposium - International Astronomical Union , Volume 151: Evolutionary Processes in Interacting Binary Stars , 1992 , pp. 411 - 414
Copyright
Copyright © Kluwer 1992 

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