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Homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code - III. omega Cen

Meszaros, Szabolcs (author)
Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre H St 112, H-9700 Szombathely, Hungary.;MTA ELTE Exoplanet Res Grp, Szombathely, Hungary.
Masseron, Thomas (author)
Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain.
Fernandez-Trincado, Jose G. (author)
Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo, Chile.;Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago, Chile.
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Garcia-Hernandez, D. A. (author)
Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain.
Szigeti, Laszlo (author)
Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre H St 112, H-9700 Szombathely, Hungary.;MTA ELTE Exoplanet Res Grp, Szombathely, Hungary.
Cunha, Katia (author)
Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA.;Observ Nacl, BR-20921400 Sao Cristovao, RJ, Brazil.
Shetrone, Matthew (author)
Univ Texas Austin, McDonald Observ, Ft Davis, TX 79734 USA.
Smith, Verne V. (author)
NOIRLab, Tucson, AZ 85719 USA.
Beaton, Rachael L. (author)
Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA.
Beers, Timothy C. (author)
Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.;Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA.
Brownstein, Joel R. (author)
Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA.
Geisler, Doug (author)
Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile.;Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Ave Raul Bitran S-N, La Serena, Chile.;Univ La Serena, Fac Ciencias, Dept Astron, Av Juan Cisternas 1200, La Serena, Chile.
Hayes, Christian R. (author)
Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA.
Jönsson, Henrik (author)
Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)
Lane, Richard R. (author)
Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago, Chile.
Majewski, Steven R. (author)
Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Minniti, Dante (author)
Univ Andres Bello, Fac Ciencias Exactas, Dept Ciencias Fis, Av Fernandez Concha 700, Santiago 7591538, Chile.;Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile.;Vatican Observ, V-00120 Vatican City, Vatican.
Munoz, Ricardo R. (author)
Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA.
Nitschelm, Christian (author)
Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 1270300, Chile.
Roman-Lopes, Alexandre (author)
Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Ave Raul Bitran S-N, La Serena, Chile.
Zamora, Olga (author)
Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain.
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Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre H St 112, H-9700 Szombathely, Hungary;MTA ELTE Exoplanet Res Grp, Szombathely, Hungary. Inst Astrofis Canarias IAC, E-38205 Tenerife, Spain.;Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain. (creator_code:org_t)
2021-04-28
2021
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 505:2, s. 1645-1660
Related links:
http://real.mtak.hu/...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We study the multiple populations of omega Cen by using the abundances of Fe, C, N, O, Mg, Al, Si, K, Ca, and Ce from the high-resolution, high signal-to-noise (S/N > 70) spectra of 982 red giant stars observed by the SDSS-IV/APOGEE-2 survey. We find that the shape of the Al-Mg and N-C anticorrelations changes as a function of metallicity, continuous for the metal-poor groups, but bimodal (or unimodal) at high metallicities. There are four Fe populations, similarly to previous literature findings, but we find seven populations based on Fe, Al, and Mg abundances. The evolution of Al in omega Cen is compared to its evolution in the Milky Way and in five representative globular clusters. We find that the distribution of Al in metal-rich stars of omega Cen closely follows what is observed in the Galaxy. Other alpha-elements and C, N, O, and Ce are also compared to the Milky Way, and significantly elevated abundances are observed over what is found in the thick disc for almost all elements. However, we also find some stars with high metallicity and low [Al/Fe], suggesting that omega Cen could be the remnant core of a dwarf galaxy, but the existence of these peculiar stars needs an independent confirmation. We also confirm the increase in the sum of CNO as a function of metallicity previously reported in the literature and find that the [C/N] ratio appears to show opposite correlations between Al-poor and Al-rich stars as a function of metallicity.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

astronomical data bases: miscellaneous
surveys
stars: abundances
globular clusters: general
globular clusters: individual: omega Cen

Publication and Content Type

ref (subject category)
art (subject category)

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