WFRF:(Helmi Amina)
Sökning: WFRF:(Helmi Amina) > Zero-metallicity Hy...
Zero-metallicity Hypernova Uncovered by an Ultra-metal-poor Star in the Sculptor Dwarf Spheroidal Galaxy
-
- Skuladottir, Asa (författare)
- Univ Studi Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy.;INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
-
- Salvadori, Stefania (författare)
- Univ Studi Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy.;INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
-
- Amarsi, Anish (författare)
- Uppsala universitet,Teoretisk astrofysik
- visa fler...
- visa färre...
- Univ Studi Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy;INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy. Teoretisk astrofysik (creator_code:org_t)
- 2021-07-13
- 2021
- Engelska.
- Ingår i: Astrophysical Journal Letters. - : Institute of Physics Publishing (IOPP). - 2041-8205 .- 2041-8213. ; 915:2
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Although true metal-free "Population III" stars have so far escaped discovery, their nature, and that of their supernovae, is revealed in the chemical products left behind in the next generations of stars. Here we report the detection of an ultra-metal-poor star in the Sculptor dwarf spheroidal galaxy AS0039. With [Fe/H](LTE) = -4.11, it is the most metal-poor star discovered in any external galaxy thus far. Contrary to the majority of Milky Way stars at this metallicity, AS0039 is clearly not enhanced in carbon, with [C/Fe](LTE) = -0.75, and A(C) = +3.60, making it the lowest detected carbon abundance in any star to date. Furthermore, it lacks alpha-element uniformity, having extremely low [Mg/Ca](NLTE) = -0.60 and [Mg/Ti](NLTE) = -0.86, in stark contrast with the near solar ratios observed in C-normal stars within the Milky Way halo. The unique abundance pattern indicates that AS0039 formed out of material that was predominantly enriched by a similar to 20 M (circle dot) progenitor star with an unusually high explosion energy E = 10 x 10(51) erg. Therefore, star AS0039 represents some of the first observational evidence for zero-metallicity hypernovae and provides a unique opportunity to investigate the diverse nature of Population III stars.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
- Astrophysical Journal Letters (Sök värdpublikationen i LIBRIS)
Till lärosätets databas
Hitta mer i SwePub
- Av författaren/redakt...
- Skuladottir, Asa
- Salvadori, Stefa ...
- Amarsi, Anish
- Tolstoy, Eline
- Irwin, Michael J ...
- Hill, Vanessa
- visa fler...
- Jablonka, Pascal ...
- Battaglia, Giuse ...
- Starkenburg, Els ...
- Massari, Davide
- Helmi, Amina
- Posti, Lorenzo
- visa färre...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Fysik
- och Astronomi astrof ...
- Artiklar i publikationen
- Astrophysical Jo ...
- Av lärosätet
- Uppsala universitet
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
