2007MNRAS.375.1381K

Query : 2007MNRAS.375.1381K

2007MNRAS.375.1381K - Mon. Not. R. Astron. Soc., 375, 1381-1398 (2007/March-2)

Kinematic structure in the Galactic halo at the North Galactic Pole: RR Lyrae and blue horizontal branch stars show different kinematics.

KINMAN T.D., CACCIARI C., BRAGAGLIA A., BUZZONI A. and SPAGNA A.

Abstract (from CDS):

Radial velocities and proper motions (derived from the GSC-II data base) are given for 38 RR Lyrae (RRL) stars and 79 blue horizontal branch (BHB) stars in a ∼200 deg2 area around the North Galactic Pole (NGP). Both heliocentric (UVW) and galactocentric (VR, Vφ, Vz) space motions are derived for these stars using a homogeneous distance scale consistent with (m - M)0= 18.52 for the Large Magellanic Cloud (LMC).

An analysis of the 26 RRL and 52 BHB stars whose height (Z) above the plane is less than 8 kpc shows that this halo sample is not homogeneous. Our BHB sample (like that of Sirko et al.) has a zero galactic rotation (Vφ) and roughly isotropic velocity dispersions. The RRL sample shows a definite retrograde rotation (Vφ= -95±29 km/s) and non-isotropic velocity dispersions. The combined BHB and RRL sample has a retrograde galactic rotation (V) that is similar to that found by Majewski for his sample of subdwarfs in Selected Area (SA) 57. The velocity dispersion of the RRL stars that have a positive W motion is significantly smaller than the dispersion of those `streaming down' with a negative W. Also, the ratio of RRL to BHB stars is smaller for the sample that has positive W.

Our halo sample occupies 10.4 kpc3 at a mean height of 5 kpc above the Galactic plane. In this volume, one component (rich in RRL stars) shows retrograde rotation and the streaming motion that we associate with the accretion process. The other component (traced by the BHB stars) shows essentially no rotation and less evidence of streaming. These two components have horizontal branch (HB) morphologies that suggest that they may be the field star equivalents of the young and old halo globular clusters, respectively. Clearly, it is quite desirable to use more than one tracer in any kinematic analysis of the halo.


Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): stars: horizontal branch - stars: kinematics - stars: variables: others - Galaxy: halo - Galaxy: structure

VizieR on-line data: <Available at CDS (J/MNRAS/375/1381): table1.dat table2.dat table8.dat table9.dat>

Simbad objects: 131

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Number of rows : 131
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 606 0
2 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
3 NAME LMC Bar PoG 05 22 08 -69 23.5           ~ 343 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
6 2MASS J12010242+3437390 HB* 12 01 02.4104508672 +34 37 39.070749216   13.748 13.67     A1.3 11 0
7 Case A-F 3 RR* 12 03 20.1641214072 +32 01 37.249894956   16.710 16.22     B 15 0
8 BSD 56-759 HB* 12 04 43.0739707656 +29 41 49.230771324   13.647 13.64     A1.7 10 0
9 V* GR Com RR* 12 05 18.6641899560 +27 56 58.014299580     16.33     ~ 22 0
10 V* GH Com RR* 12 05 24.5149229976 +27 38 21.531874308     15.38     ~ 20 0
11 V* IQ Com RR* 12 06 03.5591772840 +27 59 18.330152532     15.72     ~ 15 0
12 Case A-F 11 HB* 12 06 19.4670545760 +31 51 37.428482988   15.951 15.85     B 5 0
13 Ton 603 HB* 12 07 11.2021510464 +28 58 52.084115436   16.895 16.78     B 6 0
14 BPS BS 16549-0074 HB* 12 08 42.0466840608 +36 02 07.536391512   14.067 13.93     A1.8 7 0
15 V* DN CVn RR* 12 09 17.0005737528 +33 39 35.500150440     14.93     ~ 20 0
16 Ton 604 HB* 12 10 08.2196333616 +30 52 59.321703432   16.48 16.52 15.64   B 6 0
17 V* V Com RR* 12 10 15.9025532616 +27 25 54.066357624   13.03 13.25 13.02   kA2.5hF1.5 64 0
18 Case A-F 729 HB* 12 10 26.3610557112 +34 32 53.708626392   15.386 15.24     A0.8 5 0
19 V* CD Com RR* 12 12 34.0136533968 +30 48 02.076417972     15.40     ~ 29 0
20 Case A-F 29 HB* 12 12 59.8164099945 +33 43 12.578430529   14.981 14.85     B 4 0
21 Case A-F 30 HB* 12 13 01.8921147576 +29 09 04.373475120   14.894 14.85     A2wl 6 0
22 Case A-F 31 RR* 12 13 04.3649878320 +30 16 37.645046976     15.43     B8wl 16 0
23 V* TU Com RR* 12 13 46.9519931568 +30 59 07.591512804     13.80     A2 44 0
24 BPS BS 16022-0026 HB* 12 14 29.1504236688 +27 23 52.162600164   14.80 14.64 14.90   A0 5 0
25 V* CK Com RR* 12 14 50.5955154936 +33 06 05.850842400     14.62     ~ 36 0
26 Case A-F 38 HB* 12 15 01.5560418408 +32 02 20.083179948   15.679 15.63     B 9 0
27 Case A-F 39 HB* 12 15 04.8294343392 +30 06 17.682293016   16.644 16.65     B 6 0
28 CRTS J121535.3+323537 RS* 12 15 35.3214900579 +32 35 37.934170291   15.188 14.98     B 8 0
29 Case A-F 42 RR* 12 15 39.2725549176 +29 30 42.834729816     16.28     A1wl 18 0
30 Cl* Melotte 111 AV 834 HB* 12 16 49.8611655696 +28 56 05.636901516   13.579 13.45     A0wl 15 0
31 Ton 605 HB* 12 16 53.6748432768 +30 04 08.692883544   16.110 15.98     B 223 0
32 V* CL Com RR* 12 17 16.3242464712 +30 58 39.507979080   15.42 15.10     ~ 31 0
33 HZ 23 HB* 12 17 20.9094891720 +32 11 26.174272884   13.93 13.91 14.04   A1.1 10 0
34 Case A-F 50 HB* 12 17 34.7392539048 +29 19 23.880212328   16.792 16.57     B 6 0
35 BPS BS 16026-0008 HB* 12 18 05.5616988144 +30 17 24.223707528   14.821 14.74     A1.3 8 0
36 Ton 1497 HB* 12 18 08.4975233832 +33 24 36.866843028   15.216 15.19     A1.8 5 0
37 V* AT CVn RR* 12 18 17.0521726008 +33 39 56.000293776   15.12 14.73     A7kA3 21 0
38 V* GY Com RR* 12 19 26.0393800656 +28 27 27.421131564     15.89     ~ 21 0
39 Case A-F 63 HB* 12 22 34.2004473071 +30 08 35.891201966   16.382 16.29     B 3 0
40 Cl* Melotte 111 AV 1337 HB* 12 23 02.6083855992 +27 27 16.517203668   13.5 13.65     A1.8 11 0
41 Case A-F 754 HB* 12 23 24.9016201152 +36 31 08.721302520   15.356 15.25     A0.4 5 0
42 Case A-F 755 HB* 12 23 26.8621379832 +36 41 11.261187888   15.494 15.46     B 8 0
43 V* GS Com RR* 12 24 56.0673073896 +27 59 08.288255364     16.41     ~ 21 0
44 Case A-F 68 HB* 12 26 10.2578341128 +30 07 12.608906412   14.738 14.63     B9.8 6 0
45 Case A-F 70 HB* 12 26 37.3863404832 +28 49 24.437707680   15.237 15.19     A2wl 6 0
46 Case A-F 73 HB* 12 28 56.2521468908 +32 59 29.294939545   16.968 16.81     B 3 0
47 V* RR CVn RR* 12 29 07.4969950632 +34 38 50.120867868   11.98 12.72     kA0hA7 76 0
48 Case A-F 75 HB* 12 30 33.3357816000 +30 59 58.884878832   15.475 15.36     B9.6 5 0
49 Ton 620 HB* 12 30 44.4228852528 +30 29 28.729299156   15.848 15.72 15.83   B 5 0
50 Case A-F 77 HB* 12 30 51.9304756290 +32 34 07.005242021   15.702 15.60     B 3 0
51 LB 11236 HB* 12 31 10.6565416968 +30 51 25.774586784   14.142 14.05     B 8 0
52 V* S Com RR* 12 32 45.6251248920 +27 01 45.413618412   11.64 11.74     kA4hF3 129 0
53 Case A-F 769 HB* 12 34 07.1476807584 +33 57 00.706512132   13.722 13.66     A1.7 10 0
54 V* SV CVn RR* 12 35 55.9884906120 +37 12 24.683633856   11.60 12.77     kB8.5hF0.5 61 0
55 Cl* Melotte 111 AV 2332 HB* 12 36 21.7130358792 +27 16 33.822671088   13.0 13.40     A1.6 12 0
56 V* FV Com RR* 12 37 57.1803869928 +29 58 05.648635164     14.63     A5 30 0
57 FHB 57 HB* 12 39 18.1365478584 +29 37 52.826352420   13.830 13.74     A0IV 19 0
58 V* U Com RR* 12 40 03.1943214144 +27 29 56.132925648   11.92 11.76     kA5hF0 104 1
59 Ton 104 HB* 12 40 41.6265655752 +33 52 26.539408056   15.30 15.25 15.54   B 5 0
60 V* SW CVn RR* 12 40 55.0177526568 +37 05 06.844231212   13.47 13.09 13.16   kA3hF1.5 59 0
61 FHB 4 HB* 12 41 17.4880873872 +29 09 14.423642928   13.94 13.88     A1.7 24 0
62 BPS BS 16466-0017 HB* 12 41 38.3670948024 +33 20 55.650407244   14.48 14.35 14.41   B 5 0
63 LB 11311 HB* 12 42 07.8963944472 +30 55 40.157022504   13.20 13.19     A0V 25 0
64 [M60b]+32 327 HB* 12 42 12.3068104968 +31 56 45.878871336   11.92 11.78     A1.5IV 28 0
65 Ton 112 HB* 12 42 39.3167772576 +33 23 51.550400184   15.488 15.42 15.52   B 6 0
66 V* AQ CVn HB* 12 43 41.7389068536 +32 21 27.855617832   13.256 13.134 13.249   A0IV-V 26 0
67 V* DV Com RR* 12 43 54.4051772064 +28 01 15.785864112     14.84 14.94   F5gF2kF0 33 0
68 Case A-F 130 HB* 12 44 18.5446807800 +29 26 19.407419484   16.100 15.92     A0wl 6 0
69 Ton 638 HB* 12 44 18.6272291856 +30 55 21.313760664   15.699 15.58     B 7 0
70 [M60b]+33 385 HB* 12 44 42.2518173936 +32 29 53.914102800   12.93 12.76     A0Va 24 0
71 BPS BS 15622-0005 HB* 12 46 15.6433468488 +27 10 46.025806836   13.97 13.74 13.81   A1IV 9 0
72 BPS BS 15622-0048 HB* 12 46 43.6705347576 +27 17 15.975834252   14.65 14.45 14.59   B 4 0
73 UCAC4 588-049772 HB* 12 46 47.2937494536 +27 27 43.325370612   12.97 12.85 12.94   A2III-IV 12 0
74 V* DS CVn RR* 12 47 16.2803662800 +35 12 06.206712552   13 14.18     A7kA3 19 0
75 Ton 646 HB* 12 47 37.1209159128 +33 07 27.276504708   14.711 14.72     A0.8 7 0
76 LB 18 HB* 12 48 58.7927448792 +26 48 03.340587276   12.91 12.84     B9.7 14 0
77 V* AW Com RR* 12 49 18.0295082424 +28 49 27.203918088   16.21 15.86 15.53   A0 23 0
78 V* TX Com RR* 12 50 00.6566979528 +31 08 24.015858756     14.29     ~ 30 0
79 Case A-F 797 HB* 12 50 23.1973652280 +36 20 52.212762132   15.494 15.42     A1.3 5 0
80 V* AP CVn RR* 12 51 10.5774387360 +32 58 18.368277852   13.7 13.90 13.86   ~ 28 0
81 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
82 V* EM Com RR* 12 51 38.2867775856 +30 31 03.402587784   15.40 15.41     ~ 30 0
83 GSC 02533-00068 HB* 12 51 52.6690572744 +36 40 42.044555640   14.168 14.07 14.28   A1.3 12 0
84 ZTF J125218.69+281957.1 RR* 12 52 18.6888402720 +28 19 57.195422760   14.585 14.43     B 10 0
85 V* DV CVn RR* 12 53 51.1598028360 +32 09 55.951316388     15.03     B9.7 26 0
86 LB 11421 HB* 12 53 57.2491676760 +29 38 07.914554772   14.11 14.03     A1.2 19 0
87 [M60b]+29 483 HB* 12 54 03.6321700128 +28 51 45.911358396   12.17 12.18     A0III-IVkB9 32 0
88 Ton 669 HB* 12 54 17.9535087168 +28 43 41.763493704   16.164 15.96     B 5 0
89 V* TY CVn RR* 12 54 21.5196782448 +32 14 33.560479716     13.60     ~ 31 0
90 US 26 HB* 12 56 23.6691612000 +27 28 38.619231708     13.50     A0IV 19 0
91 V* IP Com RR* 12 56 30.8224033656 +29 53 35.229678720     14.83     ~ 25 0
92 V* LZ Com RR* 12 56 51.2046031392 +28 10 35.089349448     14.56     ~ 20 0
93 V* EO Com RR* 12 57 22.0871781264 +28 53 19.465695816   15.20 14.71     F1wl 34 0
94 PB 3156 HB* 12 57 34.6120008648 +31 48 44.814084768   16.554 16.62     B 14 0
95 Case A-F 174 HB* 12 59 13.5894533808 +30 36 18.188971956   16.395 16.31     B 7 0
96 V* UV Com RR* 12 59 34.0271311608 +30 19 24.742451892     15.58     ~ 30 0
97 BPS BS 16032-0077 HB* 12 59 43.2870226944 +31 20 29.082806556   15.38 15.20 15.30   B7.2 9 0
98 Ton 691 HB* 13 00 41.2037853840 +28 52 37.016063976   16.292 16.23     B 13 0
99 V* TZ CVn RR* 13 01 29.2028536968 +32 05 12.889227624     14.17     ~ 31 0
100 Ton 141 HB* 13 03 13.5779983104 +28 40 10.256954448   15.16 15.09     B 12 0
101 SNGP 69 HB* 13 03 20.5647470208 +28 43 27.992713656   16.422 16.33     B 5 0
102 KUV 494-35 HB* 13 04 22.7055842832 +31 30 24.383743848   15.39 15.27 15.52   B 10 0
103 BPS BS 16929-0009 HB* 13 04 56.2425756624 +35 03 30.662037936   14.40 14.37 14.56   A1.7 6 0
104 SNGP 52 HB* 13 05 08.6475035738 +27 48 00.507553558   16.858 16.71     B 4 0
105 V* MO Com RR* 13 05 14.4378320232 +28 37 12.730809360     14.25     ~ 29 0
106 US 293 HB* 13 07 19.3497002040 +30 25 55.637067432   16.170 16.03     B 7 0
107 BPS BS 16027-0034 HB* 13 08 30.2819554704 +32 43 40.004874300   14.151 14.06     A0.7 10 0
108 SA 57- reg 13 08 38 +29 23.1           ~ 179 0
109 V* MQ Com RR* 13 09 29.6831771136 +27 00 59.363976348     14.01     ~ 22 0
110 BPS BS 16027-0038 HB* 13 10 48.4368013776 +32 28 18.325817508   11.86 11.60     B 9 0
111 Ton 1563 HB* 13 11 29.3832512256 +31 47 06.265372416   14.78 14.70 14.90   B 9 0
112 Case A-F 854 HB* 13 12 01.5435387480 +37 26 54.967796736   15.168 15.11     A1.8 5 0
113 V* EW Com RR* 13 13 01.6421557584 +31 01 21.308160648     14.96     A2 21 0
114 GSC 02535-00041 HB* 13 13 10.1846165520 +30 44 59.337823164   14.23 14.20     B 11 0
115 BPS BS 16929-0038 HB* 13 13 39.2488455672 +34 27 17.627272740   14.00 13.96 14.05   A1.8 6 0
116 Case A-F 870 HB* 13 14 29.3336044383 +31 42 14.810340710   16.063 15.97     B 4 0
117 V* IS Com RR* 13 14 38.8871530728 +27 56 28.904520516   14.12 13.56     ~ 25 0
118 V* DZ CVn RR* 13 17 03.4431363456 +36 06 58.104856584   12 14.00     ~ 20 0
119 Ton 1583 HB* 13 20 25.0836334272 +33 57 55.207988964   13.67 13.74 13.89   B 6 0
120 US 589 HB* 13 20 37.1701232952 +30 12 13.352957028   16.564 16.47     B 8 0
121 Case A-F 909 HB* 13 22 11.9762305128 +31 21 31.309887888   15.26 15.22     B 8 0
122 BPS BS 16929-0063 HB* 13 23 20.8548864600 +37 47 04.567100496   12.323 12.483 12.504   B 6 0
123 Case A-F 916 HB* 13 24 15.3711133963 +33 22 12.729301348   14.181 14.00     B 4 0
124 Ton 710 HB* 13 25 02.5274277072 +29 46 17.949923436   14.08 14.12     B 9 0
125 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
126 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
127 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25           ~ 165 0
128 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
129 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
130 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
131 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2

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