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The production of beryllium in the early Galaxy

Feltzing, Sofia LU and Gustafsson, B (1994) In Astrophysical Journal 423(1). p.68-72
Abstract
The formation of beryllium in the early Galaxy is discussed. It is shown that if spallation occurs predominantly in regions rich in heavy elements, i.e., close to supernovae, the linear relation recently obtained by Gilmore et al. (1992) between beryllium and oxygen abundances for Population II stars may be reproduced. Estimates of relevant timescales for mixing show that the decisive factor, the ratio of the timescale of cosmic-ray diffusion out of the locally enriched regions to the decay time of cosmic rays in the Galaxy as a whole, admits this scenario. Although energetically possible, it requires, however, very high local cosmic-ray fluxes (greater than or equal to 105/sq cm/s), which predicts gamma-ray fluxes above those observed... (More)
The formation of beryllium in the early Galaxy is discussed. It is shown that if spallation occurs predominantly in regions rich in heavy elements, i.e., close to supernovae, the linear relation recently obtained by Gilmore et al. (1992) between beryllium and oxygen abundances for Population II stars may be reproduced. Estimates of relevant timescales for mixing show that the decisive factor, the ratio of the timescale of cosmic-ray diffusion out of the locally enriched regions to the decay time of cosmic rays in the Galaxy as a whole, admits this scenario. Although energetically possible, it requires, however, very high local cosmic-ray fluxes (greater than or equal to 105/sq cm/s), which predicts gamma-ray fluxes above those observed from supernova remnants and the Galaxy. We therefore consider other models, such as those given by Duncan et al. (1992) or Prantzos et al. (1993), more probable. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Astrophysical Journal
volume
423
issue
1
pages
68 - 72
publisher
University of Chicago Press
external identifiers
  • scopus:12044249224
ISSN
0004-637X
DOI
10.1086/173790
language
English
LU publication?
yes
id
f8a4b1c3-6827-4e9d-a0b2-9b48a7c3effe (old id 114269)
date added to LUP
2007-07-13 09:46:10
date last changed
2017-01-01 07:02:02
@article{f8a4b1c3-6827-4e9d-a0b2-9b48a7c3effe,
  abstract     = {The formation of beryllium in the early Galaxy is discussed. It is shown that if spallation occurs predominantly in regions rich in heavy elements, i.e., close to supernovae, the linear relation recently obtained by Gilmore et al. (1992) between beryllium and oxygen abundances for Population II stars may be reproduced. Estimates of relevant timescales for mixing show that the decisive factor, the ratio of the timescale of cosmic-ray diffusion out of the locally enriched regions to the decay time of cosmic rays in the Galaxy as a whole, admits this scenario. Although energetically possible, it requires, however, very high local cosmic-ray fluxes (greater than or equal to 105/sq cm/s), which predicts gamma-ray fluxes above those observed from supernova remnants and the Galaxy. We therefore consider other models, such as those given by Duncan et al. (1992) or Prantzos et al. (1993), more probable.},
  author       = {Feltzing, Sofia and Gustafsson, B},
  issn         = {0004-637X},
  language     = {eng},
  number       = {1},
  pages        = {68--72},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {The production of beryllium in the early Galaxy},
  url          = {http://dx.doi.org/10.1086/173790},
  volume       = {423},
  year         = {1994},
}