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The GALAH survey : ...
The GALAH survey : tracing the Milky Way’s formation and evolution through RR Lyrae stars
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- D’Orazi, Valentina (författare)
- University of Rome Tor Vergata,Monash University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),INAF - Osservatorio Astronomico di Padova
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- Storm, Nicholas (författare)
- Max Planck Institute for Astronomy
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- Casey, Andrew R. (författare)
- Monash University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Braga, Vittorio F. (författare)
- INAF-Osservatorio Astronomico di Roma
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- Zocchi, Alice (författare)
- University of Vienna
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- Bono, Giuseppe (författare)
- INAF-Osservatorio Astronomico di Roma,University of Rome Tor Vergata
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- Fabrizio, Michele (författare)
- INAF-Osservatorio Astronomico di Roma
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- Sneden, Christopher (författare)
- University of Texas at Austin
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- Massari, Davide (författare)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Giribaldi, Riano E. (författare)
- Université Libre de Bruxelles (ULB)
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- Bergemann, Maria (författare)
- Max Planck Institute for Astronomy
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- Campbell, Simon W. (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Monash University
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- Casagrande, Luca (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Australian National University
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- de Grijs, Richard (författare)
- Macquarie University, Sydney
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- De Silva, Gayandhi (författare)
- Macquarie University, Sydney,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Lugaro, Maria (författare)
- Research Centre For Astronomy and Earth Sciences, Hungarian Academy of Sciences,Eötvös Loránd University,Monash University
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- Zucker, Daniel B. (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Macquarie University, Sydney
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- Bragaglia, Angela (författare)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Feuillet, Diane (författare)
- Lund University,Lunds universitet,Geologiska institutionen,Naturvetenskapliga fakulteten,Department of Geology,Faculty of Science
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- Fiorentino, Giuliana (författare)
- INAF-Osservatorio Astronomico di Roma
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- Chaboyer, Brian (författare)
- Dartmouth College
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- Dall’Ora, Massimo (författare)
- INAF Osservatorio Astronomico di Capodimonte
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Marengo, Massimo (författare)
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- Martínez-Vázquez, Clara E. (författare)
- Gemini Observatory
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- Matsunaga, Noriyuki (författare)
- Kyoto Sangyo University,University of Tokyo
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- Monelli, Matteo (författare)
- Instituto de Astrofísica de Canarias,University of La Laguna (ULL),INAF-Osservatorio Astronomico di Roma
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- Mullen, Joseph P. (författare)
- Iowa State University
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Nataf, David (författare)
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- Tantalo, Maria (författare)
- INAF-Osservatorio Astronomico di Roma,University of La Laguna (ULL),Instituto de Astrofísica de Canarias
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Thevenin, Frederic (författare)
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- Vitello, Fabio R. (författare)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Kudritzki, Rolf Peter (författare)
- Ludwig-Maximilian University of Munich
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- Bland-Hawthorn, Joss (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
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- Buder, Sven (författare)
- Australian National University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Freeman, Ken (författare)
- Australian National University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Kos, Janez (författare)
- University of Ljubljana
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- Lewis, Geraint F. (författare)
- University of Sydney
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- Lind, Karin, 1984- (författare)
- Stockholms universitet,Stockholm University,Institutionen för astronomi
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- Martell, Sarah (författare)
- University of New South Wales,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Sharma, Sanjib (författare)
- University of Sydney,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Stello, Dennis (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of New South Wales,University of Sydney
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- Zwitter, Tomaž (författare)
- University of Ljubljana
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(creator_code:org_t)
- 2024
- 2024
- Engelska 26 s.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 531:1, s. 137-162
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Stellar mergers and accretion events have been crucial in shaping the evolution of the Milky Way (MW). These events have been dynamically identified and chemically characterized using red giants and main-sequence stars. RR Lyrae (RRL) variables can play a crucial role in tracing the early formation of the MW since they are ubiquitous, old (t ≥ 10 Gyr) low-mass stars and accurate distance indicators. We exploited Data Release 3 of the GALAH survey to identify 78 field RRLs suitable for chemical analysis. Using synthetic spectra calculations, we determined atmospheric parameters and abundances of Fe, Mg, Ca, Y, and Ba. Most of our stars exhibit halo-like chemical compositions, with an iron peak around [Fe/H] ≈ −1.40, and enhanced Ca and Mg content. Notably, we discovered a metal-rich tail, with [Fe/H] values ranging from −1 to approximately solar metallicity. This sub-group includes almost 1/4 of the sample, it is characterized by thin disc kinematics and displays sub-solar α-element abundances, marginally consistent with the majority of the MW stars. Surprisingly, they differ distinctly from typical MW disc stars in terms of the s-process elements Y and Ba. We took advantage of similar data available in the literature and built a total sample of 535 field RRLs for which we estimated kinematical and dynamical properties. We found that metal-rich RRLs (1/3 of the sample) likely represent an old component of the MW thin disc. We also detected RRLs with retrograde orbits and provided preliminary associations with the Gaia–Sausage–Enceladus, Helmi, Sequoia, Sagittarius, and Thamnos stellar streams.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: abundances
- Galaxy: disc
- Galaxy: halo
- stars: abundances
- stars: Population II
- stars: variables: RR Lyrae
- stars: abundances
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- art (ämneskategori)
- ref (ämneskategori)
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- Av författaren/redakt...
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D’Orazi, Valenti ...
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Storm, Nicholas
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Casey, Andrew R.
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Braga, Vittorio ...
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Zocchi, Alice
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Bono, Giuseppe
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visa fler...
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Fabrizio, Michel ...
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Sneden, Christop ...
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Massari, Davide
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Giribaldi, Riano ...
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Bergemann, Maria
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Campbell, Simon ...
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Casagrande, Luca
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de Grijs, Richar ...
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De Silva, Gayand ...
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Lugaro, Maria
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Zucker, Daniel B ...
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Bragaglia, Angel ...
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Feuillet, Diane
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Fiorentino, Giul ...
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Chaboyer, Brian
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Dall’Ora, Massim ...
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Marengo, Massimo
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Martínez-Vázquez ...
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Matsunaga, Noriy ...
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Monelli, Matteo
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Mullen, Joseph P ...
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Nataf, David
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Tantalo, Maria
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Thevenin, Freder ...
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Vitello, Fabio R ...
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Kudritzki, Rolf ...
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Bland-Hawthorn, ...
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Buder, Sven
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Freeman, Ken
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Kos, Janez
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Lewis, Geraint F ...
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Lind, Karin, 198 ...
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Martell, Sarah
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Sharma, Sanjib
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Stello, Dennis
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Zwitter, Tomaž
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