2006AJ....132.1361S

Query : 2006AJ....132.1361S

2006AJ....132.1361S - Astron. J., 132, 1361-1371 (2006/September-0)

RR Lyrae variables in M33. I. Evidence for a field halo population.

SARAJEDINI A., BARKER M.K., GEISLER D., HARDING P. and SCHOMMER R.

Abstract (from CDS):

We present observations of RR Lyrae variables in the Local Group late-type spiral galaxy M33. Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have identified 64 ab-type RR Lyrae stars in M33. We have estimated reddenings for these stars based on their minimum light V-I colors and metallicities based on their periods. From the distributions of these properties, we conclude that the RR Lyrae stars belong to two populations: one associated with the halo of M33 and the other associated with its disk. Given that RR Lyrae stars are produced by populations older than ∼10 Gyr, this suggests that not only does the field halo of M33 contain an old component, but so does its disk. This is one of the best pieces of evidence for the existence of a halo field component in M33. Using a relation between RR Lyrae absolute magnitude and metallicity (MV(RR)=0.23[Fe/H]+0.93), we estimate a mean distance modulus of <(m-M)0≥24.67±0.08 for M33. This places M33 approximately 70 kpc beyond M31 in line-of-sight distance.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: Messier Number: M33 - Galaxies: Spiral - Galaxies: Stellar Content - Stars: Variables: Other

VizieR on-line data: <Available at CDS (J/AJ/132/1361): table2.dat>

Nomenclature: Table 2: [SBG2006] NNNNNN N=72 among (Nos 21307-132766).

CDS comments: Star clusters in M 33 are [CS82] ([CS82] U49, [CS82] H10, ...).

Simbad objects: 78

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Number of rows : 78
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 [SBG2006] 95229 RR* 01 33 29.96 +30 48 21.0     26.275   25.511 ~ 1 0
3 [SBG2006] 97246 RR* 01 33 31.52 +30 48 12.3     26.159   25.596 ~ 1 0
4 [SBG2006] 77426 RR* 01 33 31.66 +30 48 57.4     26.064   25.052 ~ 1 0
5 [SBG2006] 61160 RR* 01 33 32.580 +30 49 35.22     25.794   24.860 ~ 2 0
6 [SBG2006] 85243 RR* 01 33 33.22 +30 48 03.8     26.196   25.360 ~ 1 0
7 [SBG2006] 68673 RR* 01 33 33.46 +30 48 35.4     26.359   25.091 ~ 1 0
8 [SBG2006] 100315 RR* 01 33 34.100 +30 47 15.06     26.033   25.055 ~ 2 0
9 [SBG2006] 103812 RR* 01 33 34.270 +30 47 45.61     26.056   25.079 ~ 2 0
10 [SBG2007] 4 GlC 01 33 35.0831406456 +30 49 00.041875644 19.988 19.447 18.373 17.692 17.099 ~ 27 0
11 [SBG2006] 103379 RR* 01 33 35.23 +30 49 22.4     26.249   25.575 ~ 1 0
12 [SBG2006] 120673 RR* 01 33 35.50 +30 47 23.5     25.866   25.421 ~ 1 0
13 [SBG2006] 99949 RR* 01 33 35.60 +30 50 29.9     26.552   25.546 ~ 1 0
14 [SBG2006] 114242 RR* 01 33 35.910 +30 48 05.16     25.994   25.241 ~ 2 0
15 [SBG2006] 76675 RR* 01 33 36.070 +30 49 36.18     26.010   25.221 ~ 2 0
16 [SBG2006] 66329 RR* 01 33 36.150 +30 49 19.57     25.712   25.087 ~ 2 0
17 [SBG2006] 83628 RR* 01 33 36.99 +30 48 05.0     25.371   24.959 ~ 1 0
18 [SBG2006] 97903 RR* 01 33 37.68 +30 49 28.9     26.574   25.431 ~ 1 0
19 [SBG2006] 65431 RR* 01 33 38.140 +30 50 19.25     26.075   25.080 ~ 2 0
20 [SBG2006] 104521 RR* 01 33 38.150 +30 46 32.89     26.109   25.133 ~ 2 0
21 [SBG2006] 131455 RR* 01 33 38.28 +30 48 03.6     26.667   25.426 ~ 1 0
22 [SBG2006] 102256 RR* 01 33 38.61 +30 49 11.1     26.404   25.507 ~ 1 0
23 [SBG2006] 102459 RR* 01 33 39.080 +30 48 47.16     25.725   25.122 ~ 2 0
24 [SBG2006] 102530 RR* 01 33 39.93 +30 49 14.6     26.312   25.696 ~ 1 0
25 [SBG2006] 119179 RR* 01 33 40.110 +30 48 22.53     26.191   25.324 ~ 2 0
26 [SBG2006] 109540 RR* 01 33 40.620 +30 48 30.97     25.789   25.292 ~ 2 0
27 [SBG2006] 132610 RR* 01 33 40.72 +30 47 37.6     26.386   25.371 ~ 1 0
28 [SBG2006] 88085 RR* 01 33 40.72 +30 47 46.9     25.406   25.010 ~ 1 0
29 [SBG2006] 102996 RR* 01 33 41.05 +30 47 17.6     26.160   25.133 ~ 1 0
30 [SBG2006] 88263 RR* 01 33 41.13 +30 47 25.0     25.732   25.035 ~ 1 0
31 [SBG2006] 116629 RR* 01 33 41.52 +30 48 59.9     25.994   25.336 ~ 1 0
32 [SBG2006] 95931 RR* 01 33 42.280 +30 48 48.97     25.313   25.093 ~ 2 0
33 [SBG2006] 60242 RR* 01 33 43.080 +30 48 33.28     25.477   24.721 ~ 2 0
34 [SBG2006] 72044 RR* 01 33 43.22 +30 48 06.2     25.036   24.823 ~ 1 0
35 [SBG2006] 121343 RR* 01 33 43.27 +30 47 26.3     26.255   25.259 ~ 1 0
36 [SBG2006] 132766 RR* 01 33 44.53 +30 49 22.3     26.438   25.355 ~ 1 0
37 [SSA2010] 1458 GlC 01 33 45.10 +30 47 46.7 17.210 17.081 16.298 15.823 15.311 ~ 40 0
38 [SBG2006] 88219 RR* 01 33 45.580 +30 47 55.20     25.113   24.879 ~ 2 0
39 [SBG2006] 116063 RR* 01 33 48.450 +30 48 38.95     26.142   25.287 ~ 2 0
40 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
41 [SBG2006] 63575 RR* 01 34 19.000 +30 37 49.46     25.402   24.996 ~ 2 0
42 [SBG2006] 76410 RR* 01 34 19.590 +30 37 14.70     25.657   24.824 ~ 2 0
43 [SBG2006] 73898 RR* 01 34 19.680 +30 37 33.11     25.329   24.832 ~ 2 0
44 [SBG2006] 94025 RR* 01 34 20.390 +30 37 12.04     25.962   25.015 ~ 2 0
45 [SBG2006] 119403 RR* 01 34 20.410 +30 38 29.77     26.641   25.388 ~ 2 0
46 [SBG2006] 59370 RR* 01 34 20.530 +30 38 46.74     25.134   24.740 ~ 2 0
47 [SBG2006] 69612 RR* 01 34 20.710 +30 36 44.52     25.382   24.859 ~ 2 0
48 [SBG2006] 68851 RR* 01 34 20.720 +30 36 51.92     25.194   24.865 ~ 2 0
49 [SBG2006] 94890 RR* 01 34 22.020 +30 37 38.86     25.861   25.077 ~ 2 0
50 [SBG2006] 70023 RR* 01 34 22.020 +30 38 54.29     25.345   24.907 ~ 2 0
51 [SBG2006] 86029 RR* 01 34 22.22 +30 37 55.9     25.816   24.893 ~ 1 0
52 [SBG2006] 109239 RR* 01 34 22.33 +30 37 28.4     25.431   25.356 ~ 1 0
53 [SBG2006] 77532 RR* 01 34 22.470 +30 37 23.32     25.405   24.896 ~ 2 0
54 [SBG2006] 125762 RR* 01 34 23.17 +30 36 04.7     26.006   25.532 ~ 1 0
55 [SBG2006] 87001 RR* 01 34 23.480 +30 38 02.59     25.642   25.060 ~ 2 0
56 [SBG2006] 112403 RR* 01 34 23.65 +30 37 12.7     25.883   25.607 ~ 1 0
57 [SBG2006] 88677 RR* 01 34 24.480 +30 35 55.29     25.791   24.901 ~ 2 0
58 [SBG2006] 72301 RR* 01 34 24.650 +30 36 25.94     25.343   24.861 ~ 2 0
59 [SBG2006] 43952 RR* 01 34 25.010 +30 39 06.13     25.210   24.759 ~ 2 0
60 [SBG2006] 82703 RR* 01 34 25.740 +30 37 53.37     25.530   25.007 ~ 2 0
61 [SBG2006] 92546 RR* 01 34 26.07 +30 36 53.9     25.575   24.944 ~ 1 0
62 [SBG2006] 85311 RR* 01 34 26.190 +30 37 45.42     25.727   24.848 ~ 2 0
63 [SBG2006] 49806 RR* 01 34 27.670 +30 39 19.95     25.328   24.804 ~ 2 0
64 [SBG2006] 57707 RR* 01 34 28.36 +30 37 22.1     25.815   24.913 ~ 1 0
65 [SBG2006] 53358 RR* 01 34 28.800 +30 38 22.35     25.333   24.940 ~ 2 0
66 [SBG2006] 95126 RR* 01 34 28.830 +30 36 55.17     25.970   25.004 ~ 2 0
67 [SBG2006] 97250 RR* 01 34 29.440 +30 36 41.98     25.695   25.247 ~ 2 0
68 [SBG2006] 67510 RR* 01 34 29.860 +30 37 41.84     25.662   25.212 ~ 2 0
69 [SBG2006] 50684 RR* 01 34 29.870 +30 38 19.32     25.311   24.815 ~ 2 0
70 [SSA2010] 2075 GlC 01 34 30.20 +30 38 13.0 17.848 17.880 17.127 16.618 16.108 ~ 34 0
71 [SBG2006] 21307 RR* 01 34 30.260 +30 38 12.64     24.680   24.347 ~ 2 0
72 [SBG2006] 45819 RR* 01 34 30.9090960696 +30 39 08.427387924     25.202   24.809 ~ 2 0
73 [SBG2006] 57039 RR* 01 34 31.840 +30 37 20.68     25.678   24.990 ~ 2 0
74 [SBG2006] 60843 RR* 01 34 31.880 +30 37 42.64     25.774   25.050 ~ 2 0
75 [SBG2006] 73401 RR* 01 34 32.580 +30 37 33.01     26.119   25.393 ~ 2 0
76 [SBG2006] 55610 RR* 01 34 33.870 +30 38 12.66     25.551   25.001 ~ 2 0
77 [SBG2006] 57000 RR* 01 34 33.940 +30 37 58.94     25.741   25.004 ~ 2 0
78 NAME Local Group GrG ~ ~           ~ 9325 0

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