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A deep dive into th...
A deep dive into the Type II globular cluster NGC 1851
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- Dondoglio, E. (author)
- Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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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 Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy.
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- D'Antona, F. (author)
- Ist Nazl Astrofis, Osservatorio Astron Roma, Via Frascati 33, I-00040 Rome, Italy.
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- Cordoni, G. (author)
- Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
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Legnardi, M. V. (author)
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- Lagioia, E. P. (author)
- Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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- Jang, S. (author)
- Yonsei Univ, Ctr Galaxy Evolut Res, Seoul 03722, South Korea.;Yonsei Univ, Dept Astron, Seoul 03722, South Korea.
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- Ziliotto, T. (author)
- Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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- Carlos, Marília (author)
- Uppsala universitet,Teoretisk astrofysik
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- Dell'Agli, F. (author)
- Ist Nazl Astrofis, Osservatorio Astron Roma, Via Frascati 33, I-00040 Rome, Italy.
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- Karakas, A. (author)
- Monash Univ, Sch Phys & Astron, Melbourne, Vic 3800, Australia.;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Melbourne, Vic, Australia.
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- Mohandasan, A. (author)
- Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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- Osborn, Z. (author)
- Monash Univ, Sch Phys & Astron, Melbourne, Vic 3800, Australia.;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Melbourne, Vic, Australia.
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- Tailo, M. (author)
- Univ Bologna, Dipartimento Fis & Astron Augusto Righi, Via Gobetti 93-2, I-40129 Bologna, Italy.
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Ventura, P. (author)
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Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy 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. (creator_code:org_t)
- Oxford University Press, 2023
- 2023
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 526:2, s. 2960-2976
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- About one-fifth of the Galactic globular clusters (GCs), dubbed Type II GCs, host distinct stellar populations with different heavy elements abundances. NGC 1851 is one of the most studied Type II GCs, surrounded by several controversies regarding the spatial distribution of its populations and the presence of star-to-star [Fe/H], C+N+O, and age differences. This paper provides a detailed characterization of its stellar populations through Hubble Space Telescope (HST), ground-based, and Gaia photometry. We identified two distinct populations with different abundances of s-process elements along the red-giant branch (RGB) and the subgiant branch (SGB) and detected two subpopulations among both s-poor (canonical) and s-rich (anomalous) stars. To constrain the chemical composition of these stellar populations, we compared observed and simulated colours of stars with different abundances of He, C, N, and O. It results that the anomalous population has a higher CNO overall abundance compared to the canonical population and that both host stars with different light-element abundances. No significant differences in radial segregation between canonical and anomalous stars are detected, while we find that among their subpopulations, the two most chemical extremes are more centrally concentrated. Anomalous and canonical stars show different 2D spatial distributions outside ∼3 arcmin, with the latter developing an elliptical shape and a stellar overdensity in the north-east direction. We confirm the presence of a stellar halo up to ∼80 arcmin with Gaia photometry, tagging 14 and 5 of its stars as canonical and anomalous, respectively, finding a lack of the latter in the south/south-east field.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- techniques: photometric
- stars: abundances
- stars: Population II
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Dondoglio, E.
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Milone, A. P.
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Marino, A. F.
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D'Antona, F.
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Cordoni, G.
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Legnardi, M. V.
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Lagioia, E. P.
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Jang, S.
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Ziliotto, T.
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Carlos, Marília
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Dell'Agli, F.
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Karakas, A.
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Mohandasan, A.
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Osborn, Z.
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Tailo, M.
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Ventura, P.
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- NATURAL SCIENCES
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Uppsala University