Origin of the Local Bubble

  • Burkhard Fuchs
  • Dieter Breitschwerdt
  • Miguel A. de Avillez
  • Christian Dettbarn
Part of the Space Sciences Series of ISSI book series (SSSI, volume 31)


We present a new unbiased search for OB associations in the Solar neighbourhood which have hosted the progenitor stars of the core collapse supernovae responsible for the Local Bubble in the interstellar gas. For this purpose we have analyzed a volume complete set (with a diameter of 400 pc) of B stars drawn from the \(\mathsf{Hipparcos}\) catalogue and the \(\mathsf{Arivel}\) data base, from which candidate members were selected by a kinematical criterion. After careful dereddening the star colours we have constructed a colour-magnitude diagram and confirmed that the Upper Scorpius, Upper Centaurus Lupus, and Lower Centaurus Crux subgroups of the Sco OB2 association are the youngest nearby OB associations. We dated their ages with theoretical isochrones in the range of 20–30 Myr, in agreement with previous work. We have traced backwards in time the paths of the stars and found that they entered the volume of the present bubble at 10 to 15 Myr ago. We argue that the Local Bubble began to form then and estimate that 14 to 20 supernovae have exploded since. The implied energy input into the ambient medium can be shown to be sufficient to excavate a bubble of the presently observed size.


Open clusters and associations: Sco OB2 ISM: local bubble 


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Copyright information

© Springer Science+Business Media, BV 2008

Authors and Affiliations

  • Burkhard Fuchs
    • 1
  • Dieter Breitschwerdt
    • 2
  • Miguel A. de Avillez
    • 3
  • Christian Dettbarn
    • 1
  1. 1.Astronomisches Rechen-Institut am Zentrum für Astronomie der Universität HeidelbergHeidelbergGermany
  2. 2.Institut für Astronomie der Universität WienWienAustria
  3. 3.Department of MathematicsUniversity of EvoraEvoraPortugal

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