Probing 3D and NLTE models using APOGEE observations of globular cluster stars

被引:7
作者
Masseron, T. [1 ,2 ]
Osorio, Y. [1 ,2 ]
Garcia-Hernandez, D. A. [1 ,2 ]
Allende Prieto, C. [1 ,2 ]
Zamora, O. [1 ,2 ]
Meszaros, Sz. [3 ,4 ]
机构
[1] Inst Astrofis Canarias, Tenerife 38205, Spain
[2] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain
[3] Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre H St 112, H-9700 Szombathely, Hungary
[4] MTA ELTE Exoplanet Res Grp, Szombathely, Hungary
关键词
stars: abundances; infrared: stars; atomic data; line: formation; radiative transfer; hydrodynamics; LTE LINE FORMATION; RED SUPERGIANT STARS; TO-LIMB VARIATION; INELASTIC-COLLISIONS; SOLAR GRANULATION; HYDROGEN-ATOMS; MILKY-WAY; FE; SIMULATIONS; ATMOSPHERES;
D O I
10.1051/0004-6361/202039484
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. Hydrodynamical (or 3D) and non-local thermodynamic equilibrium (NLTE) effects are known to affect abundance analyses. However, there are very few observational abundance tests of 3D and NLTE models.Aims. We developed a new way of testing the abundance predictions of 3D and NLTE models, taking advantage of large spectroscopic survey data.Methods. We use a line-by-line analysis of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectra (H band) with the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS). We compute line-by-line abundances of Mg, Si, Ca, and Fe for a large number of globular cluster K giants in the APOGEE survey. We compare this line-by-line analysis against NLTE and 3D predictions.Results. While the 1D-NLTE models provide corrections in the right direction, there are quantitative discrepancies between different models. We observe a better agreement with the data for the models including reliable collisional cross-sections. The agreement between data and models is not always satisfactory when the 3D spectra are computed in LTE. However, we note that for a fair comparison, 3D corrections should be computed with self-consistently derived stellar parameters, and not on 1D models with identical stellar parameters. Finally, we focus on 3D and NLTE effects on Fe lines in the H band, where we observe a systematic difference in abundance relative to the value from the optical. Our results suggest that the metallicities obtained from the H band are more accurate in metal-poor giants.Conclusions. Current 1D-NLTE models provide reliable abundance corrections, but only when the atom data and collisional cross-sections are accurate and complete. Therefore, we call for more atomic data for NLTE calculations. In contrast, we show that 3D corrections in LTE conditions are often not accurate enough, thus confirming that 3D abundance corrections are only valid when NLTE is taken into account. Consequently, more extended self-consistent 3D-NLTE computations need to be made. The method we have developed for testing 3D and NLTE models could be extended to other lines and elements, and is particularly suited for large spectroscopic surveys.
引用
收藏
页数:12
相关论文
共 50 条
  • [1] The APOGEE value-added catalogue of Galactic globular cluster stars
    Schiavon, Ricardo P.
    Phillips, Sian G.
    Myers, Natalie
    Horta, Danny
    Minniti, Dante
    Allende Prieto, Carlos
    Anguiano, Borja
    Beaton, Rachael L.
    Beers, Timothy C.
    Brownstein, Joel R.
    Cohen, Roger E.
    Fernandez-Trincado, Jose G.
    Frinchaboy, Peter M.
    Joensson, Henrik
    Kisku, Shobhit
    Lane, Richard R.
    Majewski, Steven R.
    Mason, Andrew C.
    Meszaros, Szabolcs
    Stringfellow, Guy S.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 528 (02) : 1393 - 1407
  • [2] Probing Na in giant exoplanets with ESPRESSO and 3D NLTE stellar spectra
    Canocchi, G.
    Morello, G.
    Lind, K.
    Carleo, I.
    Stangret, M.
    Palle, E.
    ASTRONOMY & ASTROPHYSICS, 2024, 692
  • [3] NLTE determination of the calcium abundance and 3D corrections in extremely metal-poor stars
    Spite, M.
    Andrievsky, S. M.
    Spite, F.
    Caffau, E.
    Korotin, S. A.
    Bonifacio, P.
    Ludwig, H. -G.
    Francois, P.
    Cayrel, R.
    ASTRONOMY & ASTROPHYSICS, 2012, 541
  • [4] 3D NLTE spectral line formation of lithium in late-type stars
    Wang, Ella Xi
    Nordlander, Thomas
    Asplund, Martin
    Amarsi, Anish M.
    Lind, Karin
    Zhou, Yixiao
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2021, 500 (02) : 2159 - 2176
  • [5] Matching Globular Cluster Models to Observations
    Rui, Nicholas Z.
    Kremer, Kyle
    Weatherford, Newlin C.
    Chatterjee, Sourav
    Rasio, Frederic A.
    Rodriguez, Carl L.
    Ye, Claire S.
    ASTROPHYSICAL JOURNAL, 2021, 912 (02)
  • [6] 3D NLTE Lithium abundances for late-type stars in GALAH DR3
    Wang, Ella Xi
    Nordlander, Thomas
    Buder, Sven
    Ciuca, Ioana
    Soen, Alexander
    Martell, Sarah
    Ness, Melissa
    Lind, Karin
    McKenzie, Madeleine
    Stello, Dennis
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 528 (03) : 5394 - 5411
  • [7] Non-local Thermodynamic Equilibrium Stellar Spectroscopy with 1D and ⟨3D⟩ Models. I. Methods and Application to Magnesium Abundances in Standard Stars
    Bergemann, Maria
    Collet, Remo
    Amarsi, Anish M.
    Kovalev, Mikhail
    Ruchti, Greg
    Magic, Zazralt
    ASTROPHYSICAL JOURNAL, 2017, 847 (01)
  • [8] A 3D radiative transfer framework XI. Multi-level NLTE
    Hauschildt, Peter H.
    Baron, Edward
    ASTRONOMY & ASTROPHYSICS, 2014, 566
  • [9] CHEMICAL TAGGING IN THE SDSS-III/APOGEE SURVEY: NEW IDENTIFICATIONS OF HALO STARS WITH GLOBULAR CLUSTER ORIGINS
    Martell, Sarah L.
    Shetrone, Matthew D.
    Lucatello, Sara
    Schiavon, Ricardo P.
    Meszaros, Szabolcs
    Allende Prieto, Carlos
    Garcia Hernandez, D. A.
    Beers, Timothy C.
    Nidever, David L.
    ASTROPHYSICAL JOURNAL, 2016, 825 (02)
  • [10] Observational constraints on the origin of the elements I. 3D NLTE formation of Mn lines in late-type stars
    Bergemann, Maria
    Gallagher, Andrew J.
    Eitner, Philipp
    Bautista, Manuel
    Collet, Remo
    Yakovleva, Svetlana A.
    Mayriedl, Anja
    Plez, Bertrand
    Carlsson, Mats
    Leenaarts, Jorrit
    Belyaev, Andrey K.
    Hansen, Camilla
    ASTRONOMY & ASTROPHYSICS, 2019, 631