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The complex stellar...
The complex stellar system M 22 : constraining the chemical enrichment from AGB stars using magnesium isotope ratios
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- Mckenzie, M. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, 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 Astrophys Three Dimens ASTRO 3D, Canberra, ACT 2611, Australia.
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Karakas, A. I. (författare)
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- Wang, E. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT 2611, Australia.
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- Monty, S. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
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- Marino, A. F. (författare)
- Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, IT-35122 Padua, Italy.;Ist Nazl Astrofis, Osservatorio Astrofisico Arcetri, Largo Enr Fermi 5, IT-50125 Florence, Italy.
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- Milone, A. P. (författare)
- Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, IT-35122 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy.
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- Nordlander, T. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT 2611, Australia.
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- Mura-Guzmán, A. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT 2611, Australia.
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- Martell, S. (författare)
- ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT 2611, Australia.;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.
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- Carlos, Marília (författare)
- Uppsala universitet,Teoretisk astrofysik,Astronomi och rymdfysik
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Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT 2611, Australia. Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England. (creator_code:org_t)
- Oxford University Press, 2023
- 2023
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 527:3, s. 7940-7955
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- The complex star cluster M 22 (NGC 6656) provides a unique opportunity for studying the slow neutron capture (s-)process nucleosynthesis at low metallicity due to its two stellar groups with distinct iron-peak and neutron capture element abundances. Previous studies attribute these abundance differences to pollution from 3 − 6 M asymptotic giant branch (AGB) stars which produce significant quantities of the neutron-rich Mg isotopes 25Mg and 26Mg. We report the first-ever measurements of Mg isotopic abundance ratios at [Fe/H] ∼ −2 in a globular cluster-like system using very high-resolution and signal-to-noise spectra (R = 110 000, S/N = 300 per pixel at 514 nm) from the VLT/UVES spectrograph for six stars; three in each s-process group. Despite the presence of star-to-star variations in 24Mg, 25Mg, and 26Mg, we find no correlation with heavy element abundances, implying that the nucleosynthetic source of s-process enrichment must not influence Mg isotope ratios. Instead, a key result of this work is that we identify correlations between 26Mg/24Mg and some light elements. Using a custom suite of AGB nucleosynthesis yields tailored to the metallicity of M 22, we find that low mass (∼ 1−3 M) AGB stars are capable of reproducing the observed s-process abundances of M 22 and that the absence of any difference in Mg isotope ratios between the two s-process groups precludes AGBs with masses above ∼ 3 M. This places tighter constraints on possible formation scenarios and suggests an age difference of at least ∼ 280−480 Myr between the two populations which is independent of isochrone fitting.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- techniques: spectroscopic
- stars: abundances
- stars: Population II
- globular clusters: general
- globular clusters: individual: NGC 6656
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Mckenzie, M.
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Yong, D.
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Karakas, A. I.
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Wang, E.
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Monty, S.
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Marino, A. F.
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visa fler...
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Milone, A. P.
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Nordlander, T.
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Mura-Guzmán, A.
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Martell, S.
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Carlos, Marília
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visa färre...
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