Multiple Stars across the H-R Diagram

1. Front Matter

   Pages I-XIII

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2. Evolutionary Processes in Multiple Systems

   • P.P. Eggleton, L. Kisseleva-Eggleton

   Pages 1-10

3. Dynamics and Stability of Triple Stars

   • Seppo Mikkola

   Pages 11-20

4. Multiple Stars: Physics vs. Dynamics

   • R. Zhuchkov, V. Orlov, A. Rubinov

   Pages 21-30

5. Gliese 225.2: An Old (Stable?) Quadruplet

   • V. Orlov, A. Tokovinin, O. Kiyaeva, M. Sterzik, A. Rubinov, R. Zhuchkov

   Pages 31-35

6. Multiple Stars: Designation, Catalogues, Statistics

   • A. Tokovinin

   Pages 38-42

7. Radial-velocity Studies of Certain Multiple Systems

   • R.F. Griffin

   Pages 43-45

8. Spectral Disentangling Applied to Triple Systems: RV Crt

   • H. Hensberge, L.P.R. Vaz, K.B.V. Torres, T. Armond

   Pages 47-52

9. Evidence for Rapid Variability in the Multiple System 68 u Her

   • K. Uytterhoeven, P. Koubský, P. Harmanec, J.H. Telting, S. Yang, M.T. Richards et al.

   Pages 53-58

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

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

    Pages 59-65

11. A Spectroscopic Study of HD 208905

    • Pavel Koubský, Simone Daflon, Petr Hadrava, Katia Cunha, Jiří Kubát, Dana Korčáková et al.

    Pages 67-70

12. The Suspected Binarity of the Nearby Flare Star Gl 424

    • V.S. Tamazian, J.A. Docobo, Y.Y. Balega

    Pages 71-74

13. The Ecology of Dense Star Clusters with Binaries

    • Simon F. Portegies Zwart

    Pages 75-86

14. The Formation of Multiple Stars

    • Eduardo J. Delgado-Donate, Cathie J. Clarke

    Pages 87-99

15. Population of Dynamically Formed Triples in Dense Stellar Systems

    • Natalia Ivanova

    Pages 101-106

16. Interferometric Studies of Multiple Stars

    • Christian A. Hummel

    Pages 107-112

17. Interferometric Orbits of New Hipparcos Binaries

    • I.I. Balega, Y.Y. Balega, K.-H. Hofmann, E.V. Malogolovets, D. Schertl, Z.U. Shkhagosheva et al.

    Pages 114-118

18. New Facts about δ Velorum: Fewer but Larger Components

    • A. Kellerer, M.G. Petr-Gotzens, P. Kervella, V. Coud’e du Foresto

    Pages 119-123

19. Speckle Interferometry of Two Low-mass Triple Systems in the Solar Neighbourhood

    • E.V. Malogolovets, Y.Y. Balega, K.-H. Hofmann, D. A. Rastegaev, G. Weigelt

    Pages 125-128

20. Tertiary Companions to Close Spectroscopic Binaries

    • A. Tokovinin, S. Thomas, M. Sterzik, S. Udry

    Pages 129-135

The ESO workshop “Multiple Stars across the H-R Diagram” was held in Garching on 12–15, July 2005. The topics included observations of multiple stars from ground and space, dynamical and stellar evolution in multiple systems, e?ects of the environment on multiplicity, formation and early e- lution of multiple stars, and special components of multiple stars (chemically peculiar stars, blue stragglers, brown dwarfs, etc.). Stars show a marked tendency to be in systems of di?erent multiplicity, 7 ranging from simple binaries and triples to globular clusters with N?10 . Modern observations give a frequency of binary and multiple stars in the Galactic ?eld of up to 70%, and between 5% and 20% of these systems are at least triple. There is evidence that the degree of multiplicity increases with primary mass. Many known multiple systems are too wide to have s- ni?cant physical interaction between their components. However, tidal and N-body dynamical interactions are important even in relatively wide s- tems and probably lead to the shrinkage of inner orbits. This sets the stage for spectacular evolutionary processes such as Roche-lobe over?ow, me- ers, supernovae, formation of special components, etc. Only recently did we realize that some of these processes require at least three stars. Theformationofmultiplesystemsremainsadi?cultandchallengingpart of astrophysics, although it has been addressed at the Workshop only brie?y.

• Accretion
• Binary Stars
• Exoplanets
• Globular Clusters
• Interferometry
• Multiple Stars
• Spectroscopy
• Star
• Stellar Clusters
• stellar

• European Southern Observatory, 3107 Alonso de Cordova, Chile

  Swetlana Hubrig

• European Southern Observatory, 2 Karl-Schwar schild-Str, Germany

  Monika Petr-Gotzens

• Inter-American Observatory, Cerro Tololo (CTIO), Chile

  Andrei Tokovinin

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