The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS

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The GALAH survey : An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS

Buder, S. (författare): MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany;Heidelberg Univ, Int Max Planck Res Sch Astron & Cosm Phys, Heidelberg, Germany,Max Planck Institute for Astronomy

Lind, Karin (författare): Lund University,Lunds universitet,Uppsala universitet,Observationell astrofysik,MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Max Planck Institute for Astronomy

Ness, M. K. (författare): Columbia Univ, Dept Astron, Pupin Phys Labs, New York, NY 10027 USA;Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA,Columbia University,Flatiron Institute

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Asplund, M. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia,Australian National University,Mount Stromlo Observatory,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)

Duong, L. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia,Mount Stromlo Observatory

Lin, J. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia,Mount Stromlo Observatory

Kos, J. (författare): Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia;Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia,University of Sydney,University of Ljubljana,Mount Stromlo Observatory

Casagrande, L. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia,Mount Stromlo Observatory

Casey, A. R. (författare): Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia;Monash Univ, Fac Informat Technol, Melbourne, Vic, Australia,Monash University

Bland-Hawthorn, J. (författare): Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia;Univ Calif Berkeley, Miller Inst, Berkeley, CA 94720 USA,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney

De Silva, G. M. (författare): Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia;Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia,Macquarie University, Sydney,University of Sydney

D'Orazi, V (författare): Osserv Astron Padova, Ist Nazl Astrofis, Vicolo Osservatorio 5, I-35122 Padua, Italy,INAF - Osservatorio Astronomico di Padova

Freeman, K. C. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia,Mount Stromlo Observatory,University of Ljubljana

Martell, S. L. (författare): Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of New South Wales,University of Sydney

Schlesinger, K. J. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia

Sharma, S. (författare): Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia,Princeton University,Institute for Advanced Study, Princeton,Carnegie Observatories

Simpson, J. D. (författare): Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia,University of New South Wales

Zucker, D. B. (författare): Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia,Macquarie University, Sydney

Zwitter, T. (författare): Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia,University of Ljubljana

Cotar, K. (författare): Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia

Dotter, A. (författare): Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA,Harvard–Smithsonian Center for Astrophysics

Hayden, M. R. (författare): Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia,University of Sydney

Hyde, E. A. (författare): Western Sydney Univ, Locked Bag 1797, Penrith, NSW 2751, Australia,Western Sydney University

Kafle, P. R. (författare): Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia,University of Western Australia, Crawley

Lewis, G. F. (författare): Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia,University of Sydney

Nataf, D. M. (författare): Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA,Johns Hopkins University

Nordlander, T. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Mount Stromlo Observatory

Reid, W. (författare): Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Western Sydney Univ, Locked Bag 1797, Penrith, NSW 2751, Australia,Western Sydney University,Macquarie University, Sydney,Johns Hopkins University

Rix, H-W (författare): MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany,Max Planck Institute for Astronomy

Skuladottir, A. (författare): MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany,Max Planck Institute for Astronomy

Stello, D. (författare): Univ Sydney, Sch Phys, A28, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia;Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark,Aarhus University,University of New South Wales,University of Sydney

Ting, Y-S (författare): Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA;Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA

Traven, G. (författare): Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia,University of Ljubljana

Wyse, R. F. G. (författare): Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

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(creator_code:org_t)

2019-04-02
2019
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 624

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Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

Stäng

The overlap between the spectroscopic Galactic Archaeology with HERMES (GALAH) survey and 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, and subgiant stars. These stars have spectra from the GALAH survey and high parallax precision from the Gaia DR1 Tycho-Gaia Astrometric Solution. We investigate correlations between chemical compositions, ages, and kinematics for this sample. Stellar parameters and elemental abundances are derived from the GALAH spectra with the spectral synthesis code SPECTROSCOPY MADE EASY. We determine kinematics and dynamics, including action angles, from the Gaia astrometry and GALAH radial velocities. Stellar masses and ages are determined with Bayesian isochrone matching, using our derived stellar parameters and absolute magnitudes. We report measurements of Li, C, O, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, as well as Ba and we note that we have employed non-LTE calculations for Li, O, Al, and Fe. We show that the use of astrometric and photometric data improves the accuracy of the derived spectroscopic parameters, especially log g. Focusing our investigation on the correlations between stellar age, iron abundance [Fe/H], and mean alpha-enhancement [alpha/Fe] of the magnitude-selected sample, we recover the result that stars of the high-a sequence are typically older than stars in the low-a sequence, the latter spanning iron abundances of -0.7 < [Fe/H] < +0.5. While these two sequences become indistinguishable in [alpha/Fe] vs. [Fe/H] at the metal-rich regime, we find that age can be used to separate stars from the extended high-a and the low-a sequence even in this regime. When dissecting the sample by stellar age, we find that the old stars (>8 Gyr) have lower angular momenta L-z than the Sun, which implies that they are on eccentric orbits and originate from the inner disc. 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 and show a gradient in L-z from low [Fe/H] > (L-z > L-z,L-circle dot) towards higher [Fe/H] (L-z < L-z,L-circle dot), which implies that the stars at the ends of this sequence are likely not originating from the close solar vicinity.

Ämnesord

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

surveys
solar neighborhood
Galaxy: evolution
stars: fundamental parameters
stars: abundances
stars: kinematics and dynamics
Galaxy: evolution
Solar neighborhood
Stars: abundances
Stars: fundamental parameters
Stars: kinematics and dynamics
Surveys

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Av lärosätet: Uppsala universitet; Lunds universitet

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