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Gaia and Hubble Unv...
Gaia and Hubble Unveil the Kinematics of Stellar Populations in the Type II Globular Clusters ? Centauri and M22
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- Cordoni, G. (author)
- University of Padova
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- Milone, A. P. (author)
- INAF - Osservatorio Astronomico di Padova,University of Padova
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- Marino, A. F. (author)
- University of Padova,INAF - Osservatorio Astronomico di Padova
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- Da Costa, G. S. (author)
- Australian National University
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- Dondoglio, E. (author)
- University of Padova
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- Jerjen, H. (author)
- Australian National University
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- Lagioia, E. P. (author)
- University of Padova
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- Mastrobuono-Battisti, A. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Norris, J. E. (author)
- Australian National University
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- Tailo, M. (author)
- University of Padova
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- Yong, D. (author)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Australian National University
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(creator_code:org_t)
- 2020-08-03
- 2020
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 898:2
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http://dx.doi.org/10...
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Abstract
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- The origin of multiple stellar populations in globular clusters (GCs) is one of the greatest mysteries of modern stellar astrophysics. N-body simulations suggest that the present-day dynamics of GC stars can constrain the events that occurred at high redshift and led to the formation of multiple populations. Here, we combine multiband photometry from the Hubble Space Telescope (HST) and ground-based facilities with HST and Gaia Data Release 2 proper motions to investigate the spatial distributions and the motions in the plane of the sky of multiple populations in the Type II GCs NGC 5139 (? Centauri) and NGC 6656 (M22). We first analyzed stellar populations with different metallicities. Fe-poor and Fe-rich stars in M22 share similar spatial distributions and rotation patterns and exhibit similar isotropic motions. Similarly, the two main populations with different iron abundance in ? Centauri share similar ellipticities and rotation patterns. When different radial regions are analyzed, we find that the rotation amplitude decreases from the center toward the external regions. Fe-poor and Fe-rich stars of ? Centauri are radially anisotropic in the central region and show similar degrees of anisotropy. We also investigate the stellar populations with different light-element abundances and find that their N-rich stars exhibit higher ellipticity than N-poor stars. In ? Centauri both stellar groups are radially anisotropic. Interestingly, N-rich, Fe-rich stars exhibit different rotation patterns than N-poor stars with similar metallicities. The stellar populations with different nitrogen of M22 exhibit similar rotation patterns and isotropic motions. We discuss these findings in the context of the formation of multiple populations.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Cordoni, G.
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Milone, A. P.
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Marino, A. F.
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Da Costa, G. S.
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Dondoglio, E.
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Jerjen, H.
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show more...
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Lagioia, E. P.
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Mastrobuono-Batt ...
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Norris, J. E.
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Tailo, M.
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Yong, D.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Lund University