A test for radial mixing using local star samples

Jincheng Yu, J. A. Sellwood, Carlton Pryor, Li Chen, Jinliang Hou

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We use samples of local main-sequence stars to show that the radial gradient of [Fe/H] in the thin disk of the Milky Way decreases with mean effective stellar temperature. Many of these stars are visiting the solar neighborhood from the inner and outer Galaxy. We use the angular momentum of each star about the Galactic center to determine the guiding center radius and to eliminate the effects of epicyclic motion, which would otherwise blur the estimated gradients. We interpret the effective temperature as a proxy for mean age, and conclude that the decreasing gradient is consistent with the predictions of radial mixing due to transient spiral patterns. We find some evidence that the trend of decreasing gradient with increasing mean age breaks to a constant gradient for samples of stars whose main-sequence lifetimes exceed the likely age of the thin disk.

Original languageEnglish (US)
Article number124
JournalAstrophysical Journal
Volume754
Issue number2
DOIs
StatePublished - Aug 1 2012

Fingerprint

stars
gradients
main sequence stars
angular momentum
stellar temperature
temperature
solar neighborhood
prediction
test
galaxies
trends
life (durability)
radii
predictions
effect
trend

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • galaxies: kinematics and dynamics
  • stars: abundances

Cite this

Yu, Jincheng ; Sellwood, J. A. ; Pryor, Carlton ; Chen, Li ; Hou, Jinliang. / A test for radial mixing using local star samples. In: Astrophysical Journal. 2012 ; Vol. 754, No. 2.
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A test for radial mixing using local star samples. / Yu, Jincheng; Sellwood, J. A.; Pryor, Carlton; Chen, Li; Hou, Jinliang.

In: Astrophysical Journal, Vol. 754, No. 2, 124, 01.08.2012.

Research output: Contribution to journalArticle

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AU - Yu, Jincheng

AU - Sellwood, J. A.

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AU - Hou, Jinliang

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KW - stars: abundances

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