Parameters of RR Lyrae stars

Thick disk

Proto-disk halo

Accreted halo

Number of stars

30

68

76

<[Fe/H]>

-0.57 ± 0.05

-1.54 ± 0.04

-1.59 ± 0.04

_[Fe/H]

0.28 ± 0.03

0.36 ± 0.03

0.29 ± 0.03

< >, km/s

198 ± 9

104 ± 10

-40 ± 12

, km/s

51 ± 7

84 ± 7

101 ± 8

< e >

0.23 ± 0.03

0.54 ± 0.03

0.75 ± 0.03

lim r_max , kpc

13

15

40

lim z_max , kpc

2

10

22

Z₀ , kpc

0.74 ± 0.05

3.1 ± 0.1

6.4 ± 0.5

grad_R[Fe/H], kpc^-1

-0.03 ± 0.04

-0.03 ± 0.02

-0.00 ± 0.01

grad_Z[Fe/H], kpc^-1

-0.23 ± 0.10

-0.03 ± 0.02

-0.00 ± 0.01