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The Stellar Age-Teff-Kinematical Asymmetry in the Solar Neighborhood from LAMOST

Published online by Cambridge University Press:  09 May 2016

H. J. Tian
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China China Three Gorges University, Yichang, 443002, China; hjtian@lamost.org
C. Liu
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
J. L. Carlin
Affiliation:
Earlham College, 801 National Road West, Richmond, IN 47374, USA
Y. H. Zhao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
X. L. Chen
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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Abstract

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With the velocity de-projection technique, we derived the averaged 3 dimensional local velocity distribution using only the line-of-sight velocity for the 200,000 FGK type main-sequence stars from the LAMOST DR1 data. Taking the effective temperature as a proxy for age, we investigate the variation of the velocity distribution as a function of Teff and disk height within 100 < |z| < 500 pc. Using the mean velocities of the cool stars, we derive the solar motion of (U, V, W)=(9.58±2.39, 10.52±1.96, 7.01±1.67) kms−1 with respect to the local standard of rest (LSR). Moreover, we find that the stars with Teff > 6000 K show a net asymmetric motion of 〈U〉~2 kms−1 and 〈W〉~3 kms−1 compared to the stars with Teff < 6000 K. And their azimuthal velocity increases when |z| increases. The asymmetric motion in the warmer stars is likely because they are too young and not completely relaxed.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

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