The GALAH survey: co-orbiting stars and chemical tagging

Jeffrey D. Simpson; Sarah L. Martell; Gary Da Costa; Andrew R. Casey; Ken C. Freeman; Jonathan Horner; Yuan Sen Ting; David M. Nataf; Geraint F. Lewis; Melissa K. Ness; Daniel B. Zucker; Peter L. Cottrell; Klemen Čotar; Martin Asplund; Joss Bland-Hawthorn; Sven Buder; Valentina D’Orazi; Gayandhi M. De Silva; Ly Duong; Janez Kos; Jane Lin; Karin Lind; Katharine J. Schlesinger; Sanjib Sharma; Tomaž Zwitter; Prajwal R. Kafle; Thomas Nordlander

doi:10.1093/mnras/sty3042

The GALAH survey: co-orbiting stars and chemical tagging

Jeffrey D. Simpson^*, Sarah L. Martell, Gary Da Costa, Andrew R. Casey, Ken C. Freeman, Jonathan Horner, Yuan Sen Ting, David M. Nataf, Geraint F. Lewis, Melissa K. Ness, Daniel B. Zucker, Peter L. Cottrell, Klemen Čotar, Martin Asplund, Joss Bland-Hawthorn, Sven Buder, Valentina D’Orazi, Gayandhi M. De Silva, Ly Duong, Janez KosJane Lin, Karin Lind, Katharine J. Schlesinger, Sanjib Sharma, Tomaž Zwitter, Prajwal R. Kafle, Thomas Nordlander

^*Corresponding author for this work

Australian Astronomical Optics

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Abstract

We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 pc) pairs of stars do in fact have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting. Eight of the 11 co-orbiting pairs have reliable stellar parameters and abundances, and we find that three of those are quite similar in their abundance patterns, while five have significant [Fe/H] differences. For the latter, this indicates that they could be co-orbiting because of the general dynamical coldness of the thin disc, or perhaps resonances induced by the Galaxy, rather than a shared formation site. Stars such as these, wide binaries, debris of past star formation episodes, and coincidental co-orbiters, are crucial for exploring the limits of chemical tagging in the Milky Way.

Original language	English
Pages (from-to)	5302-5315
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	482
Issue number	4
DOIs	https://doi.org/10.1093/mnras/sty3042
Publication status	Published - 1 Feb 2019

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, February 2019, Pages 5302–5315, https://doi.org/10.1093/mnras/sty3042. Copyright 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

Galaxy: disc
Stars: abundances
Stars: formation

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10.1093/mnras/sty3042

Publisher version (open access)Final published version, 4.09 MBLicence: Other

Cite this

Simpson, J. D., Martell, S. L., Da Costa, G., Casey, A. R., Freeman, K. C., Horner, J., Ting, Y. S., Nataf, D. M., Lewis, G. F., Ness, M. K., Zucker, D. B., Cottrell, P. L., Čotar, K., Asplund, M., Bland-Hawthorn, J., Buder, S., D’Orazi, V., De Silva, G. M., Duong, L., ... Nordlander, T. (2019). The GALAH survey: co-orbiting stars and chemical tagging. Monthly Notices of the Royal Astronomical Society, 482(4), 5302-5315. https://doi.org/10.1093/mnras/sty3042

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abstract = "We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 pc) pairs of stars do in fact have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting. Eight of the 11 co-orbiting pairs have reliable stellar parameters and abundances, and we find that three of those are quite similar in their abundance patterns, while five have significant [Fe/H] differences. For the latter, this indicates that they could be co-orbiting because of the general dynamical coldness of the thin disc, or perhaps resonances induced by the Galaxy, rather than a shared formation site. Stars such as these, wide binaries, debris of past star formation episodes, and coincidental co-orbiters, are crucial for exploring the limits of chemical tagging in the Milky Way.",

keywords = "Galaxy: disc, Stars: abundances, Stars: formation",

author = "Simpson, {Jeffrey D.} and Martell, {Sarah L.} and {Da Costa}, Gary and Casey, {Andrew R.} and Freeman, {Ken C.} and Jonathan Horner and Ting, {Yuan Sen} and Nataf, {David M.} and Lewis, {Geraint F.} and Ness, {Melissa K.} and Zucker, {Daniel B.} and Cottrell, {Peter L.} and Klemen {\v C}otar and Martin Asplund and Joss Bland-Hawthorn and Sven Buder and Valentina D{\textquoteright}Orazi and {De Silva}, {Gayandhi M.} and Ly Duong and Janez Kos and Jane Lin and Karin Lind and Schlesinger, {Katharine J.} and Sanjib Sharma and Toma{\v z} Zwitter and Kafle, {Prajwal R.} and Thomas Nordlander",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, February 2019, Pages 5302–5315, https://doi.org/10.1093/mnras/sty3042. Copyright 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",

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Simpson, JD, Martell, SL, Da Costa, G, Casey, AR, Freeman, KC, Horner, J, Ting, YS, Nataf, DM, Lewis, GF, Ness, MK, Zucker, DB, Cottrell, PL, Čotar, K, Asplund, M, Bland-Hawthorn, J, Buder, S, D’Orazi, V, De Silva, GM, Duong, L, Kos, J, Lin, J, Lind, K, Schlesinger, KJ, Sharma, S, Zwitter, T, Kafle, PR & Nordlander, T 2019, 'The GALAH survey: co-orbiting stars and chemical tagging', Monthly Notices of the Royal Astronomical Society, vol. 482, no. 4, pp. 5302-5315. https://doi.org/10.1093/mnras/sty3042

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T2 - co-orbiting stars and chemical tagging

AU - Simpson, Jeffrey D.

AU - Martell, Sarah L.

AU - Da Costa, Gary

AU - Casey, Andrew R.

AU - Freeman, Ken C.

AU - Horner, Jonathan

AU - Ting, Yuan Sen

AU - Nataf, David M.

AU - Lewis, Geraint F.

AU - Ness, Melissa K.

AU - Zucker, Daniel B.

AU - Cottrell, Peter L.

AU - Čotar, Klemen

AU - Asplund, Martin

AU - Bland-Hawthorn, Joss

AU - Buder, Sven

AU - D’Orazi, Valentina

AU - De Silva, Gayandhi M.

AU - Duong, Ly

AU - Kos, Janez

AU - Lin, Jane

AU - Lind, Karin

AU - Schlesinger, Katharine J.

AU - Sharma, Sanjib

AU - Zwitter, Tomaž

AU - Kafle, Prajwal R.

AU - Nordlander, Thomas

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, February 2019, Pages 5302–5315, https://doi.org/10.1093/mnras/sty3042. Copyright 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 pc) pairs of stars do in fact have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting. Eight of the 11 co-orbiting pairs have reliable stellar parameters and abundances, and we find that three of those are quite similar in their abundance patterns, while five have significant [Fe/H] differences. For the latter, this indicates that they could be co-orbiting because of the general dynamical coldness of the thin disc, or perhaps resonances induced by the Galaxy, rather than a shared formation site. Stars such as these, wide binaries, debris of past star formation episodes, and coincidental co-orbiters, are crucial for exploring the limits of chemical tagging in the Milky Way.

AB - We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 pc) pairs of stars do in fact have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting. Eight of the 11 co-orbiting pairs have reliable stellar parameters and abundances, and we find that three of those are quite similar in their abundance patterns, while five have significant [Fe/H] differences. For the latter, this indicates that they could be co-orbiting because of the general dynamical coldness of the thin disc, or perhaps resonances induced by the Galaxy, rather than a shared formation site. Stars such as these, wide binaries, debris of past star formation episodes, and coincidental co-orbiters, are crucial for exploring the limits of chemical tagging in the Milky Way.

KW - Galaxy: disc

KW - Stars: abundances

KW - Stars: formation

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UR - http://purl.org/au-research/grants/arc/CE170100013

U2 - 10.1093/mnras/sty3042

DO - 10.1093/mnras/sty3042

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SN - 0035-8711

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

The GALAH survey: co-orbiting stars and chemical tagging

Abstract

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Keywords

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