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
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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.
Journal ArticleDOI
Evidence for two early accretion events that built the Milky Way stellar halo
TL;DR: In this paper, the authors provided dynamical and chemical evidence for a second substantial accretion episode, distinct from the Gaia Sausage, which is the major accretion event that built the stellar halo of the Milky Way galaxy.
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
Journal ArticleDOI
The Gaia-Kepler Stellar Properties Catalog. I. Homogeneous Fundamental Properties for 186,301 Kepler Stars
TL;DR: The Gaia-Kepler Stellar Properties Catalog as mentioned in this paper is a set of stellar properties of 186,301 Kepler stars, homogeneously derived from isochrones and broadband photometry, Gaia Data Release 2 parallaxes, and spectroscopic metallicities, where available.
Journal ArticleDOI
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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