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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Estimating the age–metallicity distribution of a stellar sample from the probability distributions of the individual stars
TL;DR: In this paper, an algorithm for estimating the age-metallicity distribution of individual stars using the probability density functions (PDFs) of the individual stars with known metallicities is proposed.
Journal ArticleDOI
Spatial and Kinematic Clustering of Stars in the Galactic Disk
TL;DR: In this article, the authors calculate the spatial and kinematic two-point correlation functions using a sample of stars within 1 kpc of the Sun with 6D phase space information available from the Gaia DR2.
Journal ArticleDOI
The Ultraviolet Extinction Map and Dust Property at High Galactic Latitude
TL;DR: Based on the stellar parameters measured by the LAMOST and GALAH spectroscopy and the ultraviolet photomery by the \emph{GALEX} space telescope, the extinction of 1,244,504 stars in the ε-nU band and 56,123 stars in ε/FUV band were calculated precisely as discussed by the authors.
Journal ArticleDOI
A machine learning approach to photometric metallicities of giant stars
TL;DR: In this paper , a neural network approach was proposed for estimating the metallicities and distances of red giant stars with 8-band photometry and parallaxes from Gaia EDR3 and the 2MASS and WISE surveys.
Journal ArticleDOI
Ages of Main-sequence Turnoff Stars from the GALAH Survey
Xi Chen,Zhishuai Ge,Yuqin Chen,Shaolan Bi,Jie Yu,Wuming Yang,Jason W. Ferguson,Yaqian Wu,Yaguang Li +8 more
TL;DR: In this paper , the Yale rotation evolution code was used to determine the ages of 2926 MSTO stars with a mean age uncertainty of ∼10% considering the variation of C and O abundances.
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