The rich are different: evidence from the RAVE survey for stellar radial migration

G. Kordopatis; J. Binney; G. Gilmore; R. F. G. Wyse; V. Belokurov; P. J. McMillan; P. Hatfield; E. K. Grebel; M. Steinmetz; J. F. Navarro; G. Seabroke; I. Minchev; C. Chiappini; O. Bienaymé; J. Bland-Hawthorn; K. C. Freeman; B. K. Gibson; A. Helmi; U. Munari; Q. Parker; W. A. Reid; A. Siebert; A. Siviero; T. Zwitter

doi:10.1093/mnras/stu2726

The rich are different: evidence from the RAVE survey for stellar radial migration

G. Kordopatis^*, J. Binney, G. Gilmore, R. F. G. Wyse, V. Belokurov, P. J. McMillan, P. Hatfield, E. K. Grebel, M. Steinmetz, J. F. Navarro, G. Seabroke, I. Minchev, C. Chiappini, O. Bienaymé, J. Bland-Hawthorn, K. C. Freeman, B. K. Gibson, A. Helmi, U. Munari, Q. ParkerW. A. Reid, A. Siebert, A. Siviero, T. Zwitter

^*Corresponding author for this work

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Abstract

Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate the existence and the properties of super-solar metallicity stars ([M/H] ≳ +0.1dex) in the sample, and in particular in the Solar neighbourhood. We find that RAVE is rich in super-solar metallicity stars, and that the local metallicity distribution function declines remarkably slowly up to +0.4dex. Our results show that the kinematics and height distributions of the super-solar metallicity stars are identical to those of the [M/H] ≲ 0 thin-disc giants that we presume were locally manufactured. The eccentricities of the super-solar metallicity stars indicate that half of them are on a roughly circular orbit (e ≤ 0.15), so under the assumption that the metallicity of the interstellar medium at a given radius never decreases with time, they must have increased their angular momenta by scattering at corotation resonances of spiral arms from regions far inside the Solar annulus. The likelihood that a star will migrate radially does not seem to decrease significantly with increasing amplitude of vertical oscillations within range of oscillation amplitudes encountered in the disc.

Original language	English
Pages (from-to)	3526-3535
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	447
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stu2726
Publication status	Published - 11 Mar 2015

Bibliographical note

Copyright 2015 The Authors. First published in Monthly Notices of the Royal Astronomical Society, 447(4), 3526-3535. The original publication is available at http://doi.org/10.1093/mnras/stu2726, published by Oxford University Press on behalf of the Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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Kordopatis, G., Binney, J., Gilmore, G., Wyse, R. F. G., Belokurov, V., McMillan, P. J., Hatfield, P., Grebel, E. K., Steinmetz, M., Navarro, J. F., Seabroke, G., Minchev, I., Chiappini, C., Bienaymé, O., Bland-Hawthorn, J., Freeman, K. C., Gibson, B. K., Helmi, A., Munari, U., ... Zwitter, T. (2015). The rich are different: evidence from the RAVE survey for stellar radial migration. Monthly Notices of the Royal Astronomical Society, 447(4), 3526-3535. https://doi.org/10.1093/mnras/stu2726

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title = "The rich are different: evidence from the RAVE survey for stellar radial migration",

abstract = "Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate the existence and the properties of super-solar metallicity stars ([M/H] ≳ +0.1dex) in the sample, and in particular in the Solar neighbourhood. We find that RAVE is rich in super-solar metallicity stars, and that the local metallicity distribution function declines remarkably slowly up to +0.4dex. Our results show that the kinematics and height distributions of the super-solar metallicity stars are identical to those of the [M/H] ≲ 0 thin-disc giants that we presume were locally manufactured. The eccentricities of the super-solar metallicity stars indicate that half of them are on a roughly circular orbit (e ≤ 0.15), so under the assumption that the metallicity of the interstellar medium at a given radius never decreases with time, they must have increased their angular momenta by scattering at corotation resonances of spiral arms from regions far inside the Solar annulus. The likelihood that a star will migrate radially does not seem to decrease significantly with increasing amplitude of vertical oscillations within range of oscillation amplitudes encountered in the disc.",

author = "G. Kordopatis and J. Binney and G. Gilmore and Wyse, {R. F. G.} and V. Belokurov and McMillan, {P. J.} and P. Hatfield and Grebel, {E. K.} and M. Steinmetz and Navarro, {J. F.} and G. Seabroke and I. Minchev and C. Chiappini and O. Bienaym{\'e} and J. Bland-Hawthorn and Freeman, {K. C.} and Gibson, {B. K.} and A. Helmi and U. Munari and Q. Parker and Reid, {W. A.} and A. Siebert and A. Siviero and T. Zwitter",

note = "Copyright 2015 The Authors. First published in Monthly Notices of the Royal Astronomical Society, 447(4), 3526-3535. The original publication is available at http://doi.org/10.1093/mnras/stu2726, published by Oxford University Press on behalf of the Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

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Kordopatis, G, Binney, J, Gilmore, G, Wyse, RFG, Belokurov, V, McMillan, PJ, Hatfield, P, Grebel, EK, Steinmetz, M, Navarro, JF, Seabroke, G, Minchev, I, Chiappini, C, Bienaymé, O, Bland-Hawthorn, J, Freeman, KC, Gibson, BK, Helmi, A, Munari, U, Parker, Q, Reid, WA, Siebert, A, Siviero, A & Zwitter, T 2015, 'The rich are different: evidence from the RAVE survey for stellar radial migration', Monthly Notices of the Royal Astronomical Society, vol. 447, no. 4, pp. 3526-3535. https://doi.org/10.1093/mnras/stu2726

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T1 - The rich are different

T2 - evidence from the RAVE survey for stellar radial migration

AU - Kordopatis, G.

AU - Binney, J.

AU - Gilmore, G.

AU - Wyse, R. F. G.

AU - Belokurov, V.

AU - McMillan, P. J.

AU - Hatfield, P.

AU - Grebel, E. K.

AU - Steinmetz, M.

AU - Navarro, J. F.

AU - Seabroke, G.

AU - Minchev, I.

AU - Chiappini, C.

AU - Bienaymé, O.

AU - Bland-Hawthorn, J.

AU - Freeman, K. C.

AU - Gibson, B. K.

AU - Helmi, A.

AU - Munari, U.

AU - Parker, Q.

AU - Reid, W. A.

AU - Siebert, A.

AU - Siviero, A.

AU - Zwitter, T.

N1 - Copyright 2015 The Authors. First published in Monthly Notices of the Royal Astronomical Society, 447(4), 3526-3535. The original publication is available at http://doi.org/10.1093/mnras/stu2726, published by Oxford University Press on behalf of the Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2015/3/11

Y1 - 2015/3/11

N2 - Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate the existence and the properties of super-solar metallicity stars ([M/H] ≳ +0.1dex) in the sample, and in particular in the Solar neighbourhood. We find that RAVE is rich in super-solar metallicity stars, and that the local metallicity distribution function declines remarkably slowly up to +0.4dex. Our results show that the kinematics and height distributions of the super-solar metallicity stars are identical to those of the [M/H] ≲ 0 thin-disc giants that we presume were locally manufactured. The eccentricities of the super-solar metallicity stars indicate that half of them are on a roughly circular orbit (e ≤ 0.15), so under the assumption that the metallicity of the interstellar medium at a given radius never decreases with time, they must have increased their angular momenta by scattering at corotation resonances of spiral arms from regions far inside the Solar annulus. The likelihood that a star will migrate radially does not seem to decrease significantly with increasing amplitude of vertical oscillations within range of oscillation amplitudes encountered in the disc.

AB - Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate the existence and the properties of super-solar metallicity stars ([M/H] ≳ +0.1dex) in the sample, and in particular in the Solar neighbourhood. We find that RAVE is rich in super-solar metallicity stars, and that the local metallicity distribution function declines remarkably slowly up to +0.4dex. Our results show that the kinematics and height distributions of the super-solar metallicity stars are identical to those of the [M/H] ≲ 0 thin-disc giants that we presume were locally manufactured. The eccentricities of the super-solar metallicity stars indicate that half of them are on a roughly circular orbit (e ≤ 0.15), so under the assumption that the metallicity of the interstellar medium at a given radius never decreases with time, they must have increased their angular momenta by scattering at corotation resonances of spiral arms from regions far inside the Solar annulus. The likelihood that a star will migrate radially does not seem to decrease significantly with increasing amplitude of vertical oscillations within range of oscillation amplitudes encountered in the disc.

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U2 - 10.1093/mnras/stu2726

DO - 10.1093/mnras/stu2726

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VL - 447

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EP - 3535

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

The rich are different: evidence from the RAVE survey for stellar radial migration

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