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Multiplicity of massive stars Hans Zinnecker (Astrophysical Institute Potsdam, Germany)

Multiplicity of massive stars Hans Zinnecker (Astrophysical Institute Potsdam, Germany). outline Multiplicity of massive stars - a clue to their origin. 1. review of the observations 2. review of the theory 1. multiplicity data Trapezium cluster, M16 cluster, NGC 6231 etc.

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Multiplicity of massive stars Hans Zinnecker (Astrophysical Institute Potsdam, Germany)

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  1. Multiplicity of massive stars Hans Zinnecker (Astrophysical Institute Potsdam, Germany)

  2. outlineMultiplicity of massive stars - a clue to their origin 1. review of the observations 2. review of the theory 1. multiplicity data Trapezium cluster, M16 cluster, NGC 6231 etc. Sco-Cen OB association, runaway OB stars etc. 2. massive binary formation a)fragmentation of a massive circumstellar disk b) accretion onto a lower-mass binary c) coalescence: binaries as failed stellar mergers d) N-body evolution in a dense stellar cluster

  3. outlook a) implications of high-mass multiplicity derive stellar masses (eclipsing SB2) correct upper IMF slope (steepening) correct cluster vel. dispersion (dyn. mass) origin of runaway OB stars (ejection) high-mass X-ray binaries (stellar mass BH) colliding winds, orbital drag & decay effect on WR & SN-II progenitor masses distance determination using eclipsing SB2 b) predictions related to multiplicity very massive stars (M > 100 Mo)through binary mergers multiplicity of isolatedmassive stars in the field multiplicity and stellar rotationof the components multiplicity in low-metallicityenvironments (LMC / SMC)

  4. Definition „Multiplicity“ or companion star fraction (csf) Reipurth & Zinnecker 1993, A&A 278, 81 e.g. csf = 1.5 for Trapezium stars *1 single * . 1double * . . 1 triple * . : 1 quadruple PS. csf = 0.5 for low-mass stars (T Tauri stars) in Orion Nebula Cluster

  5. C1 * C2 * 0.05’’ Young, massive Orion Trapeziummultiples: orbital motion, stellar masses, & ages High-resolution infrared speckle reconstruction B4 B1 B2 B2-3: sep = 117 mas B3 0.5’’ A2 sep = 215 mas A1 0.1’’ HST image 10 AU 1997.8 1998.8 2003.8 1’’ 1999.1 2001.2 Schertl et al. (2003, A&A) sep = 38 mas

  6. Duchêne, G.; Simon, T.; Eislöffel, J.; Bouvier, J. 2001, A&A 379, 147

  7. Brown, A. G. A. 2001, AN 322, 43

  8. García, B. & Mermilliod, J. C. 2001, A&A 368, 122

  9. García, B. & Mermilliod, J. C. 2001, A&A 368, 122

  10. Mason, B. D. et al. 1998, AJ 115, 821

  11. Nelan, E. P. et al. 2004, AJ 128, 323

  12. Nelan, E. P. et al. 2004, AJ 128, 323

  13. Apai, D.; Bik, A.; Kaper,L.; Henning, Th.; Zinnecker, H. in prep.

  14. The Mon R2 young stellar cluster A false, three color composite image of the SQIID mosaics (J band = blue,H band = green, K band = red). The field of view of the mosaic isapproximately 15' x 15'. The embedded cluster is located near the centerof the mosaic, and the two blue, nebulous regions are reflection nebulaassociated with early B type stars.(Carpenter et al. 1997, AJ 114, 198)

  15. Zinnecker, Correia, Stecklum et al. 2005, in prep.

  16. Stolte, A.; Brandner, W.; Brandl, B.; Zinnecker, H.; Grebel, E. K. 2004, AJ 128, 765

  17. Moffat, A. F. J.; Drissen, L.; Shara, M. M. 1994, ApJ 436, 183

  18. Hofmann, K.-H. & Weigelt, G. 1986, A&A 167, L15

  19. Stolte, A.; Brandner, W.; Brandl, B.; Zinnecker, H.; Grebel, E. K. 2004, AJ 128, 765

  20. Weigelt, G.; Baier, G. 1985, A&A 150, L18 Massey, Ph.; Hunter, D. A. 1998, ApJ 493, 180

  21. Massey, Ph.; Penny, L. R.; Vukovich, J. 2002, ApJ 565, 982

  22. Bosch, G.; Selman, F.; Melnick, J.; Terlevich, R. 2001, A&A 380, 137

  23. Bonnell, I. A. & Bate, M. R. 2005, astro-ph/0506689

  24. Bonnell, I. A.; Bate, M. R.; Vine, St. G. 2003, MNRAS 343, 413

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