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Proceedings Paper

The orbit of the mercury-manganese binary 41 Eridani
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Paper Abstract

The mercury-manganese (HgMn) stars are a class of peculiar main-sequence late-type B stars. Their members show a wide variety of abundance anomalies with both depletions (e.g., He) and enhancements (Hg, Mn) and tend to be slow rotators relative to their normal analogs. More than two thirds of the HgMn stars are known to belong to spectroscopic binaries with a preference of orbital periods ranging from 3 to 20 days.1 Interferometric orbits were already measured for the HgMn binaries Φ Herculis,2 X Lupi,3 and α Andromedae.4 Here we report on a program to study the binarity of HgMn stars with the PIONIER near-infrared interferometer at the VLTI on Cerro Paranal, Chile. Among 40 stars, companions were found for 11 of them, and the data allowed the determination of the orbital elements of 41 Eridani, with a period of just 5 days and a semi-major axis of under 2 mas.

Paper Details

Date Published: 9 August 2016
PDF: 6 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99070Q (9 August 2016); doi: 10.1117/12.2231859
Show Author Affiliations
Christian A. Hummel, European Southern Observatory (Germany)
Markus Schöller, European Southern Observatory (Germany)
Gilles Duvert, UJF Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Jean-Baptiste Le Bouquin, UJF Grenoble 1, CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Swetlana Hubrig, Leibniz-Institut für Astrophysik Potsdam (Germany)

Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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