2002A&A...390..299B


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.13CEST00:28:42

2002A&A...390..299B - Astronomy and Astrophysics, volume 390, 299-306 (2002/7-4)

The origin of the young stellar population in the solar neighborhood – A link to the formation of the Local Bubble?

BERGHOEFER T.W. and BREITSCHWERDT D.

Abstract (from CDS):

We have analyzed the trajectories of moving stellar groups in the solar neighborhood in an attempt to estimate the number of supernova explosions in our local environment during the past 20 million years. Using Hipparcos stellar distances and the results of kinematical analyses by Asiain et al. (1999A&A...341..427A) on the Pleiades moving groups, we are able to show that subgroup B1, consisting of early type B stars up to 10M, but lacking more massive objects, has passed through the local interstellar medium within less than 100 pc. Comparing the stellar content of B1 with the initial mass function derived from the analysis of galactic OB associations, we estimate the number of supernova explosions and find that about 20 supernovae must have occurred during the past ∼10-20 million years, which is suggested to be the age of the Local Bubble; the age of the star cluster is about ∼20-30 million years. For the first time, this provides strong evidence that the Local Bubble must have been created and shaped by multi-supernova explosions and presumably been reheated more than 1 million years ago, consistent with recent findings of an excess of 60Fe in a deep ocean ferromanganese crust. Calculating similarity solutions of an expanding superbubble for time-dependent energy input, we show that the number of explosions is sufficient to explain the size of the Local Bubble. The present energy input rate is about {dot}(E)SN∼5x1036erg/s, in good agreement with the estimated local soft X-ray photon output rate. It seems plausible that the origin of the Local Bubble is also linked to the formation of the Gould Belt, which originated about 30-60Myrs ago.

Abstract Copyright:

Journal keyword(s): stars: early-type - ISM: bubbles - ISM: general - ISM: kinematics and dynamics - ISM: structure - Galaxy: solar neighborhood

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 771 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3073 0
3 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 690 0
4 NGC 2451 Cl* 07 45.4 -37 58           ~ 154 1
5 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1296 0
6 IC 2391 OpC 08 40 32 -53 02.0           ~ 735 0
7 IC 2602 OpC 10 42 58 -64 24.0           ~ 573 0
8 NAME Loop I SR? 15 01 -38.7           ~ 338 2
9 NAME Pleiades Moving Group MGr ~ ~           ~ 244 1
10 NAME Local Bubble ISM ~ ~           ~ 725 0

    Equat.    Gal    SGal    Ecl

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2021.04.13-00:28:42

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