Lampens, P. ; Frémat, Y. ; Hensberge, H. ; Tamazian, V. ; Docobo, J. A. ; Balega, Y.

published in Multiple Stars Across the H-R Diagram, pp. 59 (2008)

Abstract: DG Leo consists of three late A-type stars forming a hierarchic and spectroscopic triple system. Although all components have similar age and mass, in-depth spectroscopic analysis showed that the components nevertheless behave differently with respect to pulsation and to diffusion in their outer atmospheres. Inclusion of a speckle measure shortly after periastron passage allows to obtain a much improved orbital solution as well as a reliable dynamical parallax and systemic mass. The orbital parameters also suggest a possible coplanar configuration of both pairs. This object therefore represents a first-class opportunity to investigate the link between multiplicity, chemical composition and pulsation in a coeval system.

DOI: 10.1007/978-3-540-74745-1_9
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