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Detailed alpha abun...
Detailed alpha abundance trends in the inner Galactic bulge
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- Nieuwmunster, N. (författare)
- Lund University,Lunds universitet,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Côte d'Azur Observatory,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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- Nandakumar, G. (författare)
- 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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- Spitoni, E. (författare)
- Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS, Blvd Observ, F-06304 Nice, France.;Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus, Denmark.,Côte d'Azur Observatory,Aarhus University
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- Ryde, N. (författare)
- Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden.
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- Schultheis, M. (författare)
- Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS, Blvd Observ, F-06304 Nice, France.,Côte d'Azur Observatory
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- Rich, R. M. (författare)
- UCLA, Dept Phys & Astron, 430 Portola Plaza,Box 951547, Los Angeles, CA 90095 USA.,University of California, Los Angeles
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- Barklem, Paul (författare)
- Uppsala University,Uppsala universitet,Teoretisk astrofysik
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- Agertz, O. (författare)
- Lund University,Lunds universitet,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Renaud, F. (författare)
- Lund University,Lunds universitet,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Matteucci, F. (författare)
- Univ Trieste, Dipartimento Fis, Sez Astron, Via GB Tiepolo 11, I-34131 Trieste, Italy.;INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34131 Trieste, Italy.;INFN Sez Trieste, Via Valerio 2, I-34134 Trieste, Italy.,INAF Astronomical Observatory of Trieste,University of Trieste,INFN Section of Trieste
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(creator_code:org_t)
- 2023-03-08
- 2023
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 671
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Context. Until now, heavy interstellar extinction has meant that only a few studies of chemical abundances have been possible in the inner Galactic bulge. However, it is crucial to learn more about this structure in order to better understand the formation and evolution of the centre of the Galaxy and galaxies in general.Aims. In this paper, we aim to derive high-precision alpha-element abundances using CRIRES high-resolution IR spectra of 72 cool M giants of the inner Galactic bulge.Methods. Silicon, magnesium, and calcium abundances were determined by fitting a synthetic spectrum for each star. We also incorporated recent theoretical data into our spectroscopic analysis (i.e. updated K-band line list, better broadening parameter estimation, non-local thermodynamic equilibrium (NLTE) corrections). We compare these inner bulge alpha abundance trends with those of solar neighbourhood stars observed with IGRINS using the same line list and analysis technique; we also compare our sample to APOGEE DR17 abundances for inner bulge stars. We investigate bulge membership using spectro-photometric distances and orbital simulations. We construct a chemical-evolution model that fits our metallicity distribution function (MDF) and our alpha-element trends.Results. Among our 72 stars, we find four that are not bulge members. [Si/Fe] and [Mg/Fe] versus [Fe/H] trends show a typical thick disc alpha-element behaviour, except that we do not see any plateau at supersolar metallicities as seen in other works. The NLTE analysis lowers [Mg/Fe] typically by similar to 0.1 dex, resulting in a noticeably lower trend of [Mg/Fe] versus [Fe/H]. The derived [Ca/Fe] versus [Fe/H] trend has a larger scatter than those for Si and Mg, but is in excellent agreement with local thin and thick disc trends. With our updated analysis, we constructed one of the most detailed studies of the alpha abundance trends of cool M giants in the inner Galactic bulge. We modelled these abundances by adopting a two-infall chemical-evolution model with two distinct gas-infall episodes with timescales of 0.4 Gyr and 2 Gyr, respectively.Conclusions. Based on a very meticulous spectral analysis, we have constructed detailed and precise chemical abundances of Mg, Si, and Ca for cool M giants. The present study can be used as a benchmark for future spectroscopic surveys.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars
- abundances
- late-type
- Galaxy
- bulge
- kinematics and dynamics
- Galaxy: bulge
- Galaxy: kinematics and dynamics
- Stars: abundances
- Stars: late-type
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Nieuwmunster, N.
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Nandakumar, G.
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Spitoni, E.
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Ryde, N.
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Schultheis, M.
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Rich, R. M.
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visa fler...
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Barklem, Paul
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Agertz, O.
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Renaud, F.
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Matteucci, F.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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Astronomy and As ...
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Uppsala universitet
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Lunds universitet