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Multiple Stars Across the H-R Diagram pp 59–65Cite as

DG Leo: A Triple System with a Surprising Variety of Physical Phenomena

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Part of the book series: ESO Astrophysics Symposia ((ESO))

Summary

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.

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Author information

Authors and Affiliations

  1. Royal Observatory of Belgium, Ringlaan 3, Brussel, Belgium

    P. Lampens, Y. Frémat & H. Hensberge

  2. Observatorio Astronómico Ramón María Aller, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, Santiago de Compostela, Spain

    V. Tamazian & J.A. Docobo

  3. Special Astrophysical Observatory, N. Arkhyz, Zelenchukskaya Karachaevo-Cherkesia 369167, Russia

    Y. Balega

Authors
  1. P. Lampens
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  2. Y. Frémat
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  3. H. Hensberge
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  4. V. Tamazian
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  5. J.A. Docobo
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  6. Y. Balega
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Editor information

Editors and Affiliations

  1. European Southern Observatory, 3107 Alonso de Cordova, Santiago, Vitacura, Chile

    Swetlana Hubrig

  2. European Southern Observatory, 2 Karl-Schwar schild-Str, Garching 85748, Germany

    Monika Petr-Gotzens

  3. Inter-American Observatory, Cerro Tololo (CTIO), La Serena, Chile

    Andrei Tokovinin

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© 2008 Springer-Verlag Berlin Heidelberg

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Lampens, P., Frémat, Y., Hensberge, H., Tamazian, V., Docobo, J., Balega, Y. (2008). DG Leo: A Triple System with a Surprising Variety of Physical Phenomena. In: Hubrig, S., Petr-Gotzens, M., Tokovinin, A. (eds) Multiple Stars Across the H-R Diagram. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74745-1_9

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