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 & 7 others Jane Lin, Karin Lind, Katharine J. Schlesinger, Sanjib Sharma, Tomaž Zwitter, Prajwal R. Kafle, Thomas Nordlander

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1 Citation (Scopus)

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 languageEnglish
Pages (from-to)5302-5315
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume482
Issue number4
DOIs
Publication statusPublished - 1 Feb 2019

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tagging
marking
stars
proper motion
debris
star formation
galaxies
orbits
chemical
parameter

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Simpson, J. D., Martell, S. L., Da Costa, G., Casey, A. R., Freeman, K. C., Horner, J., ... 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
Simpson, Jeffrey D. ; Martell, Sarah L. ; Da Costa, Gary ; Casey, Andrew R. ; Freeman, Ken C. ; Horner, Jonathan ; Ting, Yuan Sen ; Nataf, David M. ; Lewis, Geraint F. ; Ness, Melissa K. ; Zucker, Daniel B. ; Cottrell, Peter L. ; Čotar, Klemen ; Asplund, Martin ; Bland-Hawthorn, Joss ; Buder, Sven ; D’Orazi, Valentina ; De Silva, Gayandhi M. ; Duong, Ly ; Kos, Janez ; Lin, Jane ; Lind, Karin ; Schlesinger, Katharine J. ; Sharma, Sanjib ; Zwitter, Tomaž ; Kafle, Prajwal R. ; Nordlander, Thomas. / The GALAH survey : Co-orbiting stars and chemical tagging. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 482, No. 4. pp. 5302-5315.
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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

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

In: Monthly Notices of the Royal Astronomical Society, Vol. 482, No. 4, 01.02.2019, p. 5302-5315.

Research output: Contribution to journalArticle

TY - JOUR

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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

PY - 2019/2/1

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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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DO - 10.1093/mnras/sty3042

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JO - Monthly Notices of the Royal Astronomical Society

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Simpson JD, Martell SL, Da Costa G, Casey AR, Freeman KC, Horner J et al. The GALAH survey: Co-orbiting stars and chemical tagging. Monthly Notices of the Royal Astronomical Society. 2019 Feb 1;482(4):5302-5315. https://doi.org/10.1093/mnras/sty3042