The production of beryllium in the early Galaxy
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/114269
- author
- Feltzing, Sofia LU and Gustafsson, B
- organization
- publishing date
- 1994
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Astrophysical Journal
- volume
- 423
- issue
- 1
- pages
- 68 - 72
- publisher
- American Astronomical Society
- 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
- 2016-04-01 16:19:20
- date last changed
- 2024-01-11 05:50:56
@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 = {{American Astronomical Society}}, series = {{Astrophysical Journal}}, title = {{The production of beryllium in the early Galaxy}}, url = {{https://lup.lub.lu.se/search/files/4637045/623778.pdf}}, doi = {{10.1086/173790}}, volume = {{423}}, year = {{1994}}, }