The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS
Sven Buder,Karin Lind,Melissa Ness,Martin Asplund,Ly Duong,J. Lin,Janez Kos,Luca Casagrande,Joss Bland-Hawthorn,Andrew R. Casey,G. M. De Silva,Valentina D'Orazi,Kenneth C. Freeman,Geraint F. Lewis,Sarah L. Martell,Katharine J. Schlesinger,Sanjib Sharma,Jeffrey D. Simpson,Daniel B. Zucker,Tomaž Zwitter,Klemen Čotar,Aaron Dotter,Michael R. Hayden,E. A. Hyde,Prajwal R. Kafle,David M. Nataf,Thomas Nordlander,Warren A. Reid,Warren A. Reid,H. W. Rix,A. Skuladottir,Dennis Stello,Yuan-Sen Ting,Yuan-Sen Ting,Gregor Traven,R. F. G. Wyse +35 more
TLDR
In this paper, the authors investigated correlations between chemical compositions, ages, and kinematics for a subset of the overlap between the spectroscopic Galactic Archaeology with HERMES (GALAH) survey and $Gaia$ provides a high-dimensional chemodynamical space of unprecedented size.Abstract:
The overlap between the spectroscopic Galactic Archaeology with HERMES (GALAH) survey & $Gaia$ provides a high-dimensional chemodynamical space of unprecedented size. We present a first analysis of a subset of this overlap, of 7066 dwarf, turn-off, & sub-giant stars. [...] We investigate correlations between chemical compositions, ages, & kinematics for this sample. Stellar parameters & elemental abundances are derived from the GALAH spectra with the spectral synthesis code SME. [...] We report Li, C, O, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, as well as Ba & we note that we employ non-LTE calculations for Li, O, Al, & Fe. We show that the use of astrometric & photometric data improves the accuracy of the derived spectroscopic parameters, especially $\log g$. [...] we recover the result that stars of the high-$\alpha$ sequence are typically older than stars in the low-$\alpha$ sequence, the latter spanning $-0.7 8$ Gyr have lower angular momenta $L_z$ than the Sun, which implies that they are on eccentric orbits & originate from the inner disk. Contrary to some previous smaller scale studies we find a continuous evolution in the high-$\alpha$-sequence up to super-solar [Fe/H] rather than a gap, which has been interpreted as a separate "high-$\alpha$ metal-rich" population. Stars in our sample that are younger than 10 Gyr, are mainly found on the low $\alpha$-sequence & show a gradient in $L_z$ from low [Fe/H] ($L_z>L_{z,\odot}$) towards higher [Fe/H] ($L_z<L_{z,\odot}$), which implies that the stars at the ends of this sequence are likely not originating from the close solar vicinity.read more
Citations
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Journal ArticleDOI
Galactic chemical evolution: Carbon through Zinc
TL;DR: In this paper, the authors calculate the evolution of heavy element abundances from C to Zn in the solar neighborhood adopting their new nucleosynthesis yields, based on the light curve and spectra fitting of individual supernovae.
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Evidence for two early accretion events that built the Milky Way stellar halo
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Journal ArticleDOI
The GALAH+ survey: Third data release
Sven Buder,Sven Buder,Sanjib Sharma,Janez Kos,Anish M. Amarsi,Thomas Nordlander,Karin Lind,Karin Lind,Sarah L. Martell,Martin Asplund,Joss Bland-Hawthorn,Andrew R. Casey,Gayandhi M. De Silva,Valentina D'Orazi,Kenneth C. Freeman,Michael R. Hayden,Geraint F. Lewis,Jane Lin,Katharine J. Schlesinger,Jeffrey D. Simpson,Dennis Stello,Dennis Stello,Dennis Stello,Daniel B. Zucker,Tomaž Zwitter,Kevin L. Beeson,Tobias Buck,Luca Casagrande,Jake T. Clark,Klemen Čotar,Gary S. Da Costa,Richard de Grijs,Richard de Grijs,Diane Feuillet,Diane Feuillet,Jonathan Horner,Prajwal R. Kafle,Shourya Khanna,Chiaki Kobayashi,F. Liu,Benjamin T. Montet,G. Nandakumar,David M. Nataf,Melissa Ness,Melissa Ness,Lorenzo Spina,Thor Tepper-García,Yuan-Sen Ting,Gregor Traven,Rok Vogrinčič,Robert A. Wittenmyer,Rosemary F. G. Wyse,Maruša Žerjal +52 more
TL;DR: In this paper, the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stab1242
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The Gaia-Kepler Stellar Properties Catalog. I. Homogeneous Fundamental Properties for 186,301 Kepler Stars
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Lithium abundances in nearby FGK dwarf and subgiant stars: internal destruction, Galactic chemical evolution, and exoplanets
TL;DR: In this article, the authors derived atmospheric parameters and lithium abundances for 671 stars and include their measurements in a literature compilation of 1381 dwarf and subgiant stars, and found that most of the stars on the low A_Li side of the desert have experienced a short-lived period of severe surface lithium destruction as main-sequence or sub-giants.
References
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Journal ArticleDOI
The GALAH survey: the data reduction pipeline
Janez Kos,Janez Kos,Jane Lin,Tomaž Zwitter,M. Žerjal,Sanjib Sharma,Joss Bland-Hawthorn,Martin Asplund,Andrew R. Casey,Gayandhi M. De Silva,Gayandhi M. De Silva,Kenneth C. Freeman,Sarah L. Martell,Jeffrey D. Simpson,Katharine J. Schlesinger,Daniel B. Zucker,Borja Anguiano,Carlos Bacigalupo,Timothy R. Bedding,Timothy R. Bedding,Christopher H. Betters,Gary S. Da Costa,Ly Duong,E. A. Hyde,Michael J. Ireland,Prajwal R. Kafle,Sergio G. Leon-Saval,Geraint F. Lewis,Ulisse Munari,David M. Nataf,Dennis Stello,Dennis Stello,C. G. Tinney,Gregor Traven,Fred G. Watson,Robert A. Wittenmyer +35 more
TL;DR: In this article, the authors present the data reduction procedures being used by the GALactic Archeology with Hermes (GALAH) survey, carried out with the HERMES fiber-fed, multi-object spectrograph on the 3.9m Anglo-Australian Telescope.
Journal ArticleDOI
Masses and Ages for 230,000 LAMOST Giants, via Their Carbon and Nitrogen Abundances
Anna Y. Q. Ho,Anna Y. Q. Ho,Hans-Walter Rix,Melissa Ness,David W. Hogg,Chao Liu,Yuan-Sen Ting,Yuan-Sen Ting +7 more
TL;DR: In this paper, the authors use The Cannon, a data-driven approach to spectral modeling, to construct a predictive model for LAMOST spectra, and apply the model to 450,000 giant stars in the ALAMOST DR2 survey.
Journal ArticleDOI
The Galactic chemical evolution of oxygen inferred from 3D non-LTE spectral-line-formation calculations
TL;DR: This article revisited the Galactic chemical evolution of oxygen, addressing the systematic errors inherent in classical determinations of the oxygen abundance that arise from the use of one-dimensional (1D) h...
Journal ArticleDOI
Fundamental stellar parameters and metallicities from Bayesian spectroscopy: application to low- and high-resolution spectra
TL;DR: In this paper, a method based on Bayesian inference was proposed to derive physical parameters of stars from any observed data, such as log(g), Teff, [Fe/H], age, mass, and distance of a star.
Journal ArticleDOI
On the metallicity dependence of the [Y/Mg]-age relation for solar-type stars
TL;DR: In this article, it was shown that the relation between [Y/Mg] and age depends on the [Fe/H] of the stars, and that the relationship is unique to solar analogues.
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