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
Multi-Object Spectroscopy Field Configuration by Simulated Annealing
TL;DR: In this article, a field configuration algorithm (FCA) used to select targets for observation is identified as mainly responsible for such effects, which may imprint artificial structure on observed target distributions, potentially to the detriment of statistical analyses applied to such surveys.
Journal ArticleDOI
Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements
Xunzhou Chen,Zhishuai Ge,Yuqin Chen,Shaolan Bi,Jie Yu,Jie Yu,Jie Yu,Tanda Li,Tanda Li,Yaguang Li,Jason W. Ferguson,Jinghua Zhang,Yaqian Wu +12 more
Journal ArticleDOI
Local metallicity distribution function derived from Galactic large-scale radial iron pattern modelling
Yu. N. Mishurov,R. V. Tkachenko +1 more
TL;DR: In this paper, an approach for fitting the results of modeling of wriggling radial large scale iron pattern along the Galactic disk, derived over young (high massive) Cepheids, with the metallicity distribution, obtained using low mass long living dwarf stars in the close solar vicinity.
The Stellar Kinematics in the Solar Neighborhood From LAMOST Data
TL;DR: In this article, the authors used about 200,000 FGK type main-sequence stars from the LAMOST DR1 data to map the local stellar kinematics and derive the averaged 3D velocity and velocity ellipsoids using only the line-of-sight velocity for the stars with various effective temperatures within 100 < |z| < 500 pc.
Journal ArticleDOI
The STAR-MELT Python package for emission line analysis of YSOs
J. Campbell-White,A. Sicilia-Aguilar,Carlo F. Manara,Soko Matsumura,Min Fang,Antonio Frasca,Veronica Roccatagliata,Veronica Roccatagliata +7 more
TL;DR: Star-Melt as discussed by the authors automatically extracts, identifies and fits emission lines from high-resolution stellar spectra to investigate variability in the line profiles and corresponding emitting regions, which can be used to probe the innermost disc and accretion structures of YSOs.
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