2015A&A...574A..15F

Query : 2015A&A...574A..15F

2015A&A...574A..15F - Astronomy and Astrophysics, volume 574A, 15-15 (2015/2-1)

Searching for tidal tails around ω Centauri using RR Lyrae stars.

FERNANDEZ-TRINCADO J.G., VIVAS A.K., MATEU C.E., ZINN R., ROBIN A.C., VALENZUELA O., MORENO E. and PICHARDO B.

Abstract (from CDS):

We present a survey of RR Lyrae stars in an area of 50deg2 around the globular cluster ω Centauri, aimed at detecting debris material from the alleged progenitor galaxy of the cluster. We detected 48 RR Lyrae stars, only 11 of which have been previously reported. Ten of the eleven previously known stars were found inside the tidal radius of the cluster. The rest were located outside the tidal radius up to distances of ∼6-degrees from the center of the cluster. Several of these stars are located at distances similar to that of ω Centauri. We investigate the probability that they may have been stripped off the cluster. To do this, we studied their properties (mean periods) by calculating the expected halo and thick-disk population of RR Lyrae stars in this part of the sky, analyzing the radial velocity of a sub-sample of the RR Lyrae stars, and finally, studying the probable orbits of this sub-sample around the Galaxy. The results of these investigations do not support the scenario that there is significant tidal debris around ω Centauri, which confirms previous studies on the region. It is puzzling that tidal debris has been found elsewhere but not near the cluster itself.

Abstract Copyright: ∼

Journal keyword(s): stars: variables: RR Lyrae - stars: kinematics and dynamics - globular clusters: individual: ω Centauri - globular clusters: individual: NGC 5139 - stars: horizontal-branch

VizieR on-line data: <Available at CDS (J/A+A/574/A15): table12.dat>

Nomenclature: Table 1-2: [FVM2015] NN (Nos 1-50).

Simbad objects: 58

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Number of rows : 58
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* X Ari RR* 03 08 30.8846437148 +10 26 45.218712967 9.45 9.25 8.97     F0.5 292 0
2 V* T Sex RR* 09 53 28.3999961376 +02 03 26.346205512 10.22 10.04 9.82     A1V 161 0
3 [FVM2015] 1 RR* 13 19 08.9731758216 -49 30 08.030747232     15.06     ~ 3 0
4 [FVM2015] 2 RR* 13 19 25.4010928704 -47 05 04.409349648     15.11     ~ 2 0
5 [FVM2015] 3 RR* 13 21 09.4061241696 -47 00 58.917075516     16.66     ~ 1 0
6 Cl* NGC 5139 SAW V175 RR* 13 22 22.8730398888 -48 19 04.334562228     13.22     ~ 8 0
7 CRTS J132310.3-453548 RR* 13 23 10.3497090600 -45 35 49.013019924     14.37     ~ 3 0
8 Cl* NGC 5139 SAW V160 RR* 13 25 36.0763764984 -47 12 32.210368236   14.81 14.52     ~ 18 0
9 Cl* NGC 5139 B V73 RR* 13 25 53.6533266048 -47 16 10.614267192   14.980 14.49     ~ 19 0
10 Cl* NGC 5139 B V54 RR* 13 26 23.4999960336 -47 18 48.094551756 14.918 15.228 14.42   13.748 ~ 33 0
11 Cl* NGC 5139 B V67 RR* 13 26 28.5605456616 -47 18 47.206425312 15.426 14.785 14.68 14.228 14.052 hF5.5 31 0
12 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3426 0
13 Cl* NGC 5139 B V7 RR* 13 27 01.0175343984 -47 14 00.133614492   14.990 14.42     hF5.5 29 0
14 Cl* NGC 5139 B V36 RR* 13 27 10.1916262176 -47 15 29.517696432   14.810 14.46     hF4 27 0
15 Cl* NGC 5139 B V75 RR* 13 27 19.6922315400 -47 18 46.965557556 14.856 14.734 14.439 14.071 13.823 ~ 28 0
16 Cl* NGC 5139 SAW V149 RR* 13 27 32.8492265856 -47 13 43.326355188   14.940 14.33   14.02 ~ 21 0
17 Cl* NGC 5139 B V72 RR* 13 27 33.0210297984 -47 16 22.723920372   14.890 14.50     hF3 22 0
18 Cl* NGC 5139 SAW V172 RR* 13 27 55.0381730208 -47 04 38.407987200     14.60   13.66 ~ 13 0
19 [FVM2015] 16 RR* 13 30 26.9249243088 -49 27 52.917137964         15.03 ~ 1 0
20 [FVM2015] 17 RR* 13 30 30.1297087536 -44 36 02.491984116     16.05     ~ 1 0
21 [FVM2015] 49 V* 13 30 34.5613891704 -45 59 39.510523680     14.02     ~ 1 0
22 [FVM2015] 18 RR* 13 30 43.7836795440 -45 34 35.450530680     16.26     ~ 1 0
23 [FVM2015] 19 RR* 13 31 06.1814746728 -45 45 50.853624840     15.76     ~ 1 0
24 [FVM2015] 20 RR* 13 31 28.6730806248 -45 01 41.545769412         16.04 ~ 1 0
25 CRTS J133316.3-470744 RR* 13 33 16.1686376688 -47 07 44.605451172     14.94   14.45 ~ 2 0
26 [FVM2015] 22 RR* 13 34 19.0811675856 -45 41 37.651770564     17.38     ~ 2 0
27 [FVM2015] 23 RR* 13 34 22.8023548656 -45 24 43.245054108     15.39     ~ 1 0
28 [FVM2015] 24 RR* 13 34 49.8886749696 -48 37 41.215441692         15.25 ~ 1 0
29 [FVM2015] 25 RR* 13 34 51.7205798496 -45 46 14.428086528     14.94     ~ 1 0
30 CRTS J133548.1-470123 RR* 13 35 48.1916657760 -47 01 23.428488468     15.57   15.27 ~ 2 0
31 CRTS J133604.3-481553 RR* 13 36 04.1083297296 -48 15 56.908752048     15.95   15.36 ~ 2 0
32 CRTS J133632.2-474929 RR* 13 36 32.2242627672 -47 49 30.472976100     13.85   13.55 ~ 2 0
33 [FVM2015] 29 RR* 13 36 39.3934823232 -45 39 05.733891180     17.23     ~ 1 0
34 [FVM2015] 30 RR* 13 36 50.9182698384 -47 13 34.284501732         15.26 ~ 1 0
35 CRTS J133755.5-431309 RR* 13 37 55.7241775896 -43 13 07.578843132     17.35     ~ 2 0
36 [FVM2015] 32 RR* 13 39 22.0671124320 -44 35 42.975014604     15.35     ~ 1 0
37 CRTS J134134.8-445646 RR* 13 41 34.7233607448 -44 56 45.741883452     13.02     ~ 2 0
38 [FVM2015] 50 V* 13 44 36.4798048128 -44 11 31.721257212         14.18 ~ 1 0
39 [FVM2015] 34 RR* 13 45 25.8529620888 -46 10 15.093219900         16.40 ~ 1 0
40 CRTS J134736.2-445228 RR* 13 47 36.2979095376 -44 52 28.551460332     15.53   15.15 ~ 2 0
41 CRTS J134740.7-453641 RR* 13 47 40.8017811936 -45 36 41.331892248     13.60   13.18 ~ 2 0
42 [FVM2015] 37 RR* 13 49 35.4958384248 -44 06 27.559708812         15.14 ~ 2 0
43 CRTS J134952.4-443829 RR* 13 49 52.5886193400 -44 38 27.518265240     15.47   15.08 ~ 2 0
44 [FVM2015] 39 RR* 13 51 08.6966426184 -44 33 21.019699980         15.72 ~ 1 0
45 CRTS J135116.9-451145 RR* 13 51 17.0213125776 -45 11 44.070073440     16.66   16.29 ~ 3 0
46 [FVM2015] 41 RR* 13 52 15.6893344992 -44 42 26.273900088         14.95 ~ 1 0
47 CRTS J135339.3-440531 RR* 13 53 39.2362701456 -44 05 31.830203940     14.06   13.62 ~ 2 0
48 [FVM2015] 43 RR* 13 54 30.7211024976 -44 26 15.012762684         15.77 ~ 1 0
49 CRTS J135507.2-441951 RR* 13 55 07.2549380376 -44 19 53.932055088     15.16   14.52 ~ 2 0
50 CRTS J135532.9-442015 RR* 13 55 32.8623586416 -44 20 18.256699428     15.98   15.44 ~ 2 0
51 CRTS J135549.0-435445 RR* 13 55 49.0555023864 -43 54 45.791050968     15.04   14.41 ~ 2 0
52 CRTS J135605.2-442943 RR* 13 56 05.3092966104 -44 29 42.342485928     16.83   16.42 ~ 2 0
53 CRTS J135633.7-435415 RR* 13 56 33.7415848752 -43 54 15.698254752     15.37   15.05 ~ 2 0
54 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14412 0
55 V* BL Her WV* 18 01 09.2240599584 +19 14 56.696475012   10.54 9.70     F0 172 0
56 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1068 0
57 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2187 2
58 V* DH Peg RR* 22 15 25.6397704896 +06 49 21.439610112 9.72 9.51 9.25 9.23   kA4hF0.5 187 0

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