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Extremely metal-poor stars from the cosmic dawn in the bulge of the Milky Way
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- Howes, L. M. (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2601, Australia.
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- Casey, A. R. (author)
- Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.
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- Asplund, M. (author)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2601, Australia.
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- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2601, Australia Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England. (creator_code:org_t)
- 2015-11-11
- 2015
- English.
- In: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 527:7579, s. 484-487
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The first stars are predicted to have formed within 200 million years after the Big Bang(1), initiating the cosmic dawn. A true first star has not yet been discovered, although stars(2-4) with tiny amounts of elements heavier than helium ('metals') have been found in the outer regions ('halo') of the Milky Way. The first stars and their immediate successors should, however, preferentially be found today in the central regions ('bulges') of galaxies, because they formed in the largest over-densities that grew gravitationally with time(5,6). The Milky Way bulge underwent a rapid chemical enrichment during the first 1-2 billion years(7), leading to a dearth of early, metal-poor stars(8,9). Here we report observations of extremely metal-poor stars in the Milky Way bulge, including one star with an iron abundance about 10,000 times lower than the solar value without noticeable carbon enhancement. We confirm that most of the metal-poor bulge stars are on tight orbits around the Galactic Centre, rather than being halo stars passing through the bulge, as expected for stars formed at redshifts greater than 15. Their chemical compositions are in general similar to typical halo stars of the same metallicity although intriguing differences exist, including lower abundances of carbon.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
- Howes, L. M.
- Casey, A. R.
- Asplund, M.
- Keller, S. C.
- Yong, D.
- Nataf, D. M.
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- Poleski, R.
- Lind, Karin
- Kobayashi, C.
- Owen, C. I.
- Ness, M.
- Bessell, M. S.
- Da Costa, G. S.
- Schmidt, B. P.
- Tisserand, P.
- Udalski, A.
- Szymanski, M. K.
- Soszynski, I.
- Pietrzynski, G.
- Ulaczyk, K.
- Wyrzykowski, L.
- Pietrukowicz, P.
- Skowron, J.
- Kozlowski, S.
- Mroz, P.
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- About the subject
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- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- Articles in the publication
- Nature
- By the university
- Uppsala University
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