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Multiple stellar populations in globular clusters with JWST : an NIRCam view of 47 Tucanae
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- Milone, A. P. (author)
- Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.;Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
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- Marino, A. F. (author)
- Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.;Ist Nazl Astrofis, Osservatorio Astrofisico Arcetri, Largo Enr Fermi 5, I-50125 Florence, Italy.
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- Dotter, A. (author)
- Dartmouth Coll, Dept Phys & Astron, Wilder Lab 6127, Hanover, NH 03755 USA.
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- Legnardi, M. , V (author)
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- Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy;Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy. Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.;Ist Nazl Astrofis, Osservatorio Astrofisico Arcetri, Largo Enr Fermi 5, I-50125 Florence, Italy. (creator_code:org_t)
- Oxford University Press, 2023
- 2023
- English.
- In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 522:2, s. 2429-2447
- Journal article (peer-reviewed)
Abstract
Subject headings
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- We use images collected with the near-infrared camera (NIRCam) onboard the JWST and with the Hubble Space Telescope ( HST ) to investigate multiple populations at the bottom of the main sequence (MS) of 47 Tucanae. The m(F115W) versus m(F 115 W )- m(F322W2) colour-magnitude diagram (CMD) from NIRCam sho ws that, belo w the knee, the MS stars span a wide colour range, where the majority of M-dwarfs exhibit blue colours, and a tail of stars are distributed towards the red. A similar pattern is observed from the m(F160W) versus m(F 110 W) - m(F160W) CMD from HST , and multiple populations of M-dwarfs are also visible in the optical mF606W versus m(F606W -) m(F814W) CMD. The NIRCam CMD shows a narrow sequence of faint MS stars with masses smaller than 0 . 1 M-?. We introduce a chromosome map of M-dwarfs that reveals an extended first population and three main groups of second-population stars. By combining isochrones and synthetic spectra with appropriate chemical composition, we simulate colours and magnitudes of different stellar populations in the NIRCam filters (at metallicities [Fe/H] = -1.5 and [Fe/H] = -0.75) and identify the photometric bands that provide the most efficient diagrams to investigate the multiple populations in globular clusters. Models are compared with the observed CMDs of 47 Tucanae to constrain M-dwarfs' chemical composition. Our analysis suggests that the oxygen range needed to reproduce the colours of first-and second-population M-dwarfs is similar to that inferred from spectroscopy of red giants, constraining the proposal that the chemical variations are due to mass transfer phenomena in proto-clusters.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- techniques: photometry
- stars: abundances
- stars: population II
- (Galaxy:) globular clusters: general
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Milone, A. P.
- Marino, A. F.
- Dotter, A.
- Ziliotto, T.
- Dondoglio, E.
- Cordoni, G.
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- Jang, S.
- Lagioia, E. P.
- Legnardi, M. , V
- Mohandasan, A.
- Tailo, M.
- Yong, D.
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- Carlos, Marília
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