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3He and4He in the local interstellar gas as observed with the COLLISA foil experiment on the Mir space station

Published online by Cambridge University Press:  23 December 2005

P. Bochsler
Affiliation:
Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland email: bochsler@soho.unibe.ch
Yu. N. Agafonov
Affiliation:
Space Research Institute (IKI), Russian Academy of Sciences, Moscow, Russia
F. Bühler
Affiliation:
Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland email: bochsler@soho.unibe.ch
H. Busemann
Affiliation:
Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland email: bochsler@soho.unibe.ch Present address: Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington D.C., USA
N. A. Eismont
Affiliation:
Space Research Institute (IKI), Russian Academy of Sciences, Moscow, Russia
A. Grimberg
Affiliation:
Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zürich, Switzerland
V. S. Heber
Affiliation:
Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zürich, Switzerland
E. Salerno
Affiliation:
Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland email: bochsler@soho.unibe.ch
R. Wieler
Affiliation:
Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zürich, Switzerland
G. N. Zastenker
Affiliation:
Space Research Institute (IKI), Russian Academy of Sciences, Moscow, Russia
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Abstract

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With the COLLISA foil experiment onboard the Mir space station we have collected samples of interstellar helium, which have been returned to the Earth and investigated by mass spectrometric analysis. Recently, we have been able to reduce the experimental uncertainties as given earlier (Salerno et al. 2003). Our improved estimate of the helium isotopic ratio in the local interstellar medium is now ($^3$He/$^4$He)$_{LISM}$=(1.62 $\pm$ 0.29)$\,{\times}\,$10$^{-4}$ (Busemann et al. 2005).

Type
Contributed Papers
Copyright
© 2005 International Astronomical Union