Insights from super-metal-rich stars: Is the Milky Way bar young?

被引：24

作者：

Nepal, S. ^{[1
,2
]}

Chiappini, C. ^{[1
]}

Guiglion, G. ^{[3
,4
]}

Steinmetz, M. ^{[1
]}

Perez-Villegas, A. ^{[5
]}

Queiroz, A. B. ^{[1
]}

Miglio, A. ^{[6
]}

Dohme, P. ^{[7
]}

Khalatyan, A. ^{[1
]}

机构：

[1] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[2] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany

[3] Heidelberg Univ, Zentrum Astron, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg, Germany

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] Univ Nacl Autonoma Mexico, Inst Astron, AP 106, Ensenada 22800, BC, Mexico

[6] Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy

[7] Free Univ Berlin, Fachbereich Phys, Arnimallee 14, D-14195 Berlin, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 681卷

基金：

欧洲研究理事会;

关键词：

stars: abundances; stars: fundamental parameters; Galaxy: abundances; Galaxy: evolution; Galaxy: kinematics and dynamics; CHEMICAL EVOLUTION; GALACTIC BAR; GAIA DR2; SOLAR NEIGHBORHOOD; FORMATION HISTORY; RADIAL MIGRATION; DATA RELEASE; RED GIANTS; STELLAR; DISK;

D O I：

10.1051/0004-6361/202348365

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Bar formation and merger events can contribute to the rearrangement of stars within the Galaxy in addition to triggering star formation (SF) epochs. Super-metal-rich (SMR) stars found in the solar neighbourhood (SNd) can be used as tracers of such events as they are expected to originate only in the inner Galaxy and to have definitely migrated.Aims. We study a homogeneous and large sample of SMR stars in the SNd to provide tighter constraints on the epoch of the bar formation and its impact on the Milky Way (MW) disc stellar populations.Methods. We investigated a sample of 169 701 main sequence turnoff (MSTO) and subgiant branch (SGB) stars with 6D phase space information and high-quality stellar parameters coming from the hybrid-CNN analysis of theGaia-DR3 RVS stars. We computed distances and ages using the Star Horse code with a mean precision of 1% and 11%, respectively. Of these stars, 11 848 have metallicity ([Fe/H]) above 0.15 dex.Results. We report a metallicity dependence of spatial distribution of stellar orbits shown by the bimodal distribution in the guiding radius (R-g) at 6.9 and 7.9 kpc, first appearing at [Fe/H]similar to 0.1 dex, becoming very pronounced at higher [Fe/H]. In addition, we observe a trend where the most metal-rich stars, with [Fe/H]similar to 0.4 dex, are predominantly old (9-12 Gyr), but show a gradual decline in [Fe/H]with age, reaching approximately 0.25 dex about 4 Gyr ago, followed by a sharp drop around 3 Gyr ago. Furthermore, our full dataset reveals a clear peak in the age-metallicity relationship during the same period, indicating a SF burst around 3-4 Gyr ago with slightly sub-solar [Fe/H] and enhanced [alpha/Fe].Conclusions. We show that the SMR stars are good tracers of bar activity. We interpret the steep decrease in the number of SMR stars at around 3 Gyr as the end of the bar formation epoch. In this scenario the peak of bar activity also coincides with a peak in the SF activity in the disc. Although the SF burst around 3 Gyr ago has been reported previously, its origin was unclear. Here we suggest that the SF burst was triggered by the high bar activity, 3-4 Gyr ago. According to these results and interpretation, the MW bar could be young

引用

页数：10

共 91 条

[71] StarHorse results for spectroscopic surveys and Gaia DR3: Chrono-chemical populations in the solar vicinity, the genuine thick disk, and young alpha-rich stars [J].

Queiroz, A. B. A. ;

Anders, F. ;

Chiappini, C. ;

Khalatyan, A. ;

Santiago, B. X. ;

Nepal, S. ;

Steinmetz, M. ;

Gallart, C. ;

Valentini, M. ;

Dal Ponte, M. ;

Barbuy, B. ;

Perez-Villegas, A. ;

Masseron, T. ;

Fernandez-Trincado, J. G. ;

Khoperskov, S. ;

Minchev, I. ;

Fernandez-Alvar, E. ;

Lane, R. R. ;

Nitschelm, C. .

ASTRONOMY & ASTROPHYSICS, 2023, 673

[72] The Milky Way bar and bulge revealed by APOGEE and Gaia EDR3 [J].

Queiroz, A. B. A. ;

Chiappini, C. ;

Perez-Villegas, A. ;

Khalatyan, A. ;

Anders, F. ;

Barbuy, B. ;

Santiago, B. X. ;

Steinmetz, M. ;

Cunha, K. ;

Schultheis, M. ;

Majewski, S. R. ;

Minchev, I ;

Minniti, D. ;

Beaton, R. L. ;

Cohen, R. E. ;

da Costa, L. N. ;

Fernandez-Trincado, J. G. ;

Garcia-Hernandez, D. A. ;

Geisler, D. ;

Hasselquist, S. ;

Lane, R. R. ;

Nitschelm, C. ;

Rojas-Arriagada, A. ;

Roman-Lopes, A. ;

Smith, V ;

Zasowski, G. .

ASTRONOMY & ASTROPHYSICS, 2021, 656

[73] StarHorse: a Bayesian tool for determining stellar masses, ages, distances, and extinctions for field stars [J].

Queiroz, A. B. A. ;

Anders, F. ;

Santiago, B. X. ;

Chiappini, C. ;

Steinmetz, M. ;

Dal Ponte, M. ;

Stassun, K. G. ;

da Costa, L. N. ;

Maia, M. A. G. ;

Crestani, J. ;

Beers, T. C. ;

Fernandez-Trincado, J. G. ;

Garcia-Hernandez, D. A. ;

Roman-Lopes, A. ;

Zamora, O. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 476 (02) :2556-2583

[74] Gaia Data Release 3 Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy [J].

Recio-Blanco, A. ;

De laverny, P. ;

Palicio, P. A. ;

Kordopatis, G. ;

Alvarez, M. A. ;

Schultheis, M. ;

Contursi, G. ;

Zhao, H. ;

Elipe, G. Torralba ;

Ordenovic, C. ;

Manteiga, M. ;

Dafonte, C. ;

Oreshina-Slezak, I. ;

Bijaoui, A. ;

Fremat, Y. ;

Seabroke, G. ;

Pailler, F. ;

Spitoni, E. ;

Poggio, E. ;

Creevey, O. L. ;

Aramburu, A. Abreu ;

Accart, S. ;

Andrae, R. ;

Bailer-Jones, C. A. L. ;

Bellas-Velidis, I. ;

Brouillet, N. ;

Brugaletta, E. ;

Burlacu, A. ;

Carballo, R. ;

Casamiquela, L. ;

Chiavassa, A. ;

Cooper, W. J. ;

Dapergolas, A. ;

Delchambre, L. ;

Dharmawardena, T. E. ;

Drimmel, R. ;

Edvardsson, B. ;

Fouesneau, M. ;

Garabato, D. ;

Garcia-Lario, P. ;

Garcia-Torres, M. ;

Gavel, A. ;

Gomez, A. ;

Gonzalez-Santamaria, I. ;

Hatzidimitriou, D. ;

Heiter, U. ;

Piccolo, A. Jean-Antoine ;

Kontizas, M. ;

Korn, A. J. ;

Lanzafame, A. C. .

ASTRONOMY & ASTROPHYSICS, 2023, 674

[75] Gaia Early Data Release 3: Photometric content and validation [J].

Riello, M. ;

De Angeli, F. ;

Evans, D. W. ;

Montegriffo, P. ;

Carrasco, J. M. ;

Busso, G. ;

Palaversa, L. ;

Burgess, P. W. ;

Diener, C. ;

Davidson, M. ;

Rowell, N. ;

Fabricius, C. ;

Jordi, C. ;

Bellazzini, M. ;

Pancino, E. ;

Harrison, D. L. ;

Cacciari, C. ;

van Leeuwen, F. ;

Hambly, N. C. ;

Hodgkin, S. T. ;

Osborne, P. J. ;

Altavilla, G. ;

Barstow, M. A. ;

Brown, A. G. A. ;

Castellani, M. ;

Cowell, S. ;

De Luise, F. ;

Gilmore, G. ;

Giuffrida, G. ;

Hidalgo, S. ;

Holland, G. ;

Marinoni, S. ;

Pagani, C. ;

Piersimoni, A. M. ;

Pulone, L. ;

Ragaini, S. ;

Rainer, M. ;

Richards, P. J. ;

Sanna, N. ;

Walton, N. A. ;

Weiler, M. ;

Yoldas, A. .

ASTRONOMY & ASTROPHYSICS, 2021, 649

[76] An intermittent star formation history in a "normal" disk Galaxy: The Milky Way [J].

Rocha-Pinto, HJ ;

Scalo, J ;

Maciel, WJ ;

Flynn, C .

ASTROPHYSICAL JOURNAL, 2000, 531 (02) :L115-L118

[77] Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars [J].

Sahlholdt, Christian L. ;

Feltzing, Sofia ;

Feuillet, Diane K. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2022, 510 (04) :4669-4688

[78] Local kinematics and the local standard of rest [J].

Schoenrich, Ralph ;

Binney, James ;

Dehnen, Walter .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 403 (04) :1829-1833

[79] Secular evolution in disk galaxies [J].

Sellwood, J. A. .

REVIEWS OF MODERN PHYSICS, 2014, 86 (01) :1-46

[80] The Two Micron All Sky Survey (2MASS) [J].

Skrutskie, MF ;

Cutri, RM ;

Stiening, R ;

Weinberg, MD ;

Schneider, S ;

Carpenter, JM ;

Beichman, C ;

Capps, R ;

Chester, T ;

Elias, J ;

Huchra, J ;

Liebert, J ;

Lonsdale, C ;

Monet, DG ;

Price, S ;

Seitzer, P ;

Jarrett, T ;

Kirkpatrick, JD ;

Gizis, JE ;

Howard, E ;

Evans, T ;

Fowler, J ;

Fullmer, L ;

Hurt, R ;

Light, R ;

Kopan, EL ;

Marsh, KA ;

McCallon, HL ;

Tam, R ;

Van Dyk, S ;

Wheelock, S .

ASTRONOMICAL JOURNAL, 2006, 131 (02) :1163-1183

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