Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-08
Mon.Not.Roy.Astron.Soc.373:993-1003,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 8 figures, accepted by Mon. Not. R. Astron. Soc
Scientific paper
10.1111/j.1365-2966.2006.11044.x
We present a new unbiased search and analysis of all B stars in the solar neighbourhood (within a volume of 400 pc diameter) using the Arivel data base to track down the remains of the OB associations, which hosted the supernovae responsible for the Local Bubble in the interstellar gas. We find after careful dereddening and by comparison with theoretical isochrones, that besides the Upper Scorpius the Upper Centaurus Lupus and Lower Centaurus Crux subgroups are the youngest stellar associations in the solar neighbourhood with ages of 20 to 30 Myr, in agreement with previous work. In search for the ``smoking gun'' of the origin of the Local Bubble, we have traced the paths of the associations back into the past and found that they entered the present bubble region 10 to 15 Myr ago. We argue that the Local Bubble began to form then and estimate that 14 to 20 supernovae have gone off since. It is shown that the implied energy input is sufficient to excavate a bubble of the presently observed size.
Breitschwerdt Dieter
de Avillez Miguel A.
Dettbarn Christian
Flynn Chris
Fuchs Bernard
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