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The lowest detected...
The lowest detected stellar Fe abundance : the halo star SMSS J160540.18-144323.1
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- Nordlander, T. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia
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- Bessell, M. S. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia
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- Da Costa, G. S. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
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- Mackey, A. D. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia
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- Asplund, M. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia
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- Casey, A. R. (författare)
- Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia;Monash Univ, Fac Informat Technol, Clayton, Vic 3800, Australia
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- Chiti, A. (författare)
- MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
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- Ezzeddine, R. (författare)
- MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA;Joint Inst Nucl Astrophys, Ctr Evolut Elements, E Lansing, MI 48824 USA
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- Frebel, A. (författare)
- MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA;Joint Inst Nucl Astrophys, Ctr Evolut Elements, E Lansing, MI 48824 USA
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- Lind, Karin (författare)
- Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany;
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- Marino, A. F. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy
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- Murphy, S. J. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;Univ New South Wales, Sch Sci, Canberra, ACT 2600, Australia
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- Norris, J. E. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
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- Schmidt, B. P. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
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- Yong, D. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia
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(creator_code:org_t)
- 2019-07-17
- 2019
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 488:1, s. L109-L113
- Relaterad länk:
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https://uu.diva-port... (primary) (Raw object)
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https://dspace.mit.e...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We report the discovery of SMSS J160540.18-144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure [Fe/H] = -6.2 +/- 0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbon-enhanced, [C/Fe] = 3.9 +/- 0.2, while other abundances are compatible with an alpha-enhanced solar-like pattern with [Ca/Fe] = 0.4 +/- 0.2, [Mg/Fe] = 0.6 +/- 0.2, [Ti/Fe] = 0.8 +/- 0.2, and no significant s- or r-process enrichment, [Sr/Fe] < 0.2 and [Ba/Fe] < 1.0 (3 sigma limits). Population III stars exploding as fallback supernovae may explain both the strong carbon enhancement and the apparent lack of enhancement of odd-Z and neutron-capture element abundances. Grids of supernova models computed for metal-free progenitor stars yield good matches for stars of about 10 M circle dot imparting a low kinetic energy on the supernova ejecta, while models for stars more massive than roughly 20 M circle dot are incompatible with the observed abundance pattern.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: abundances
- stars: individual: SMSS J160540.18-144323.1
- stars: Population III
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Till lärosätets databas
- Av författaren/redakt...
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Nordlander, T.
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Bessell, M. S.
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Da Costa, G. S.
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Mackey, A. D.
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Asplund, M.
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Casey, A. R.
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visa fler...
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Chiti, A.
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Ezzeddine, R.
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Frebel, A.
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Lind, Karin
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Marino, A. F.
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Murphy, S. J.
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Norris, J. E.
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Schmidt, B. P.
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Yong, D.
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