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Proper-Motion Based Kinematics Study of Galactic RR Lyraes

Published online by Cambridge University Press:  09 May 2016

Andrei K. Dambis ,
Leonid N. Berdnikov ,
Alexei S. Rastorguev  and
Marina V. Zabolotskikh
Andrei K. Dambis
Affiliation:
Sternberg Astronomical Institute, M.V.Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992Russia email: dambis@yandex.ru
Leonid N. Berdnikov
Affiliation:
Sternberg Astronomical Institute, M.V.Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992Russia email: dambis@yandex.ru Astronomy and Astrophysics Research division, Entoto Observatory and Research Center, P.O. Box 8412, Addis Ababa, Ethiopia
Alexei S. Rastorguev
Affiliation:
Sternberg Astronomical Institute, M.V.Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992Russia email: dambis@yandex.ru
Marina V. Zabolotskikh
Affiliation:
Sternberg Astronomical Institute, M.V.Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992Russia email: dambis@yandex.ru
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Abstract

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We use the UCAC4 and SDSS proper motions of about 7500 RR Lyrae type variables located within ~10 kpc from the Sun to study the dependence of their velocity ellipsoid on Galactocentric distance in the RG = 3–17 kpc interval. The radial velocity dispersion, σVR, decreases from ~190 km/s at RG = 3.5–5.5 kpc down to ~100 km/s at RG = 13–15 kpc, and the σVT/σVR ratio remains virtually constant (σVT/σVR ~0.54–0.64) in the Galactocentric distance interval from RG = 4.5 kpc to RG = 10.5 kpc increasing to ~0.9 both toward the Galactic center and beyond RG = 11 kpc.

Keywords

stars: kinematicsstars: RR LyraeGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 290 - 291
Copyright
Copyright © International Astronomical Union 2016 

References

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