2010ApJ...708..293Y

Query : 2010ApJ...708..293Y

2010ApJ...708..293Y - Astrophys. J., 708, 293-303 (2010/January-1)

RR Lyrae variables in the Local Group dwarf galaxy NGC 147.

YANG S.-C. and SARAJEDINI A.

Abstract (from CDS):

We investigate the RR Lyrae (RRL) population in NGC 147, a dwarf satellite galaxy of M31 (Andromeda). We used both Thuan-Gunn g-band ground-based photometry from the literature and Hubble Space Telescope Wide Field Planetary Camera 2 archival data in the F555W and F814W passbands to investigate the pulsation properties of RRL variable candidates in NGC 147. These data sets represent the two extreme cases often found in RRL studies with respect to the phase coverage of the observations and the quality of the photometric measurements. Extensive artificial variable star tests for both cases were performed. We conclude that neither data set is sufficient to confidently determine the pulsation properties of the NGC 147 RRLs. Thus, while we can assert that NGC 147 contains RRL variables, and therefore a population older than ∼10 Gyr, it is not possible at this time to use the pulsation properties of these RRLs to study other aspects of this old population. Our results provide a good reference for gauging the completeness of RRL variable detection in future studies.

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Journal keyword(s): galaxies: dwarf - galaxies: individual: NGC 147 - methods: analytical - methods: data analysis - stars: horizontal-branch - stars: Population II - stars: variables: other

Nomenclature: Table 4: [YS2010] VNNNNN N=36 among (Nos V15719-V58117).

Simbad objects: 76

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Number of rows : 76
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 [SHM90] C3-V 13 V* 00 32 24.61 +48 30 13.8     24.32     ~ 3 0
2 [SHM90] C4-V 9 RR* 00 32 26.57 +48 37 12.8     24.70     ~ 3 0
3 [SHM90] C4-V 8 RR* 00 32 28.67 +48 35 33.8     24.74     ~ 3 0
4 [SHM90] C4-V 7 RR* 00 32 29.47 +48 35 55.8     24.86     ~ 3 0
5 [SHM90] C3-V 12 RR* 00 32 29.55 +48 32 45.8     24.47     ~ 3 0
6 [SHM90] C4-V 6 RR* 00 32 31.89 +48 35 54.8     24.63     ~ 3 0
7 [SHM90] C3-V 11 RR* 00 32 34.47 +48 30 51.7     24.22     ~ 3 0
8 [SHM90] C4-V 5 RR* 00 32 35.91 +48 36 51.7     24.70     ~ 3 0
9 [SHM90] C3-V 10 RR* 00 32 37.39 +48 32 10.7     24.59     ~ 3 0
10 [SHM90] C3-V 9 RR* 00 32 37.70 +48 32 56.7     24.50     ~ 3 0
11 [SHM90] C4-V 4 RR* 00 32 39.74 +48 37 02.7     24.55     ~ 3 0
12 [SHM90] C3-V 8 RR* 00 32 42.91 +48 30 07.7     24.30     ~ 3 0
13 [SHM90] C4-V 3 RR* 00 32 43.25 +48 36 56.7     24.88     ~ 3 0
14 [SHM90] C3-V 7 Ce* 00 32 43.73 +48 32 46.7     24.20     ~ 3 0
15 [SHM90] C4-V 2 RR* 00 32 43.76 +48 36 56.7     24.91     ~ 3 0
16 [SHM90] C3-V 6 Ce* 00 32 44.23 +48 31 20.6     24.25     ~ 4 0
17 [SHM90] C3-V 5 RR* 00 32 44.73 +48 32 23.6     24.61     ~ 3 0
18 [SHM90] C3-V 4 RR* 00 32 45.44 +48 32 51.6     24.21     ~ 3 0
19 [SHM90] C4-V 1 Ce* 00 32 46.67 +48 36 13.6     24.34     ~ 3 0
20 [SHM90] C3-V 3 Ce* 00 32 46.73 +48 30 09.6     23.88     ~ 3 0
21 [SHM90] C3-V 1 RR* 00 32 46.94 +48 31 35.6     24.68     ~ 3 0
22 [SHM90] C3-V 2 RR* 00 32 47.04 +48 31 33.6     24.73     ~ 3 0
23 [SHM90] C1-V 14 RR* 00 32 54.11 +48 37 11.5     24.67     ~ 3 0
24 [SHM90] C1-V 13 RR* 00 32 54.22 +48 38 12.5     24.16     ~ 3 0
25 [SHM90] C1-V 12 RR* 00 32 55.82 +48 36 01.5     24.32     ~ 3 0
26 [SHM90] C1-V 11 Ce* 00 32 57.54 +48 38 19.5     23.98     ~ 3 0
27 [SHM90] C1-V 10 Ce* 00 32 58.13 +48 36 38.5     23.88     ~ 3 0
28 [SHM90] C1-V 9 RR* 00 33 01.26 +48 38 17.5     24.38     ~ 3 0
29 [SHM90] C1-V 8 RR* 00 33 02.35 +48 36 25.5     24.27     ~ 3 0
30 [SHM90] C1-V 7 RR* 00 33 02.66 +48 36 26.5     23.96     ~ 3 0
31 [SHM90] C1-V 6 RR* 00 33 03.56 +48 35 30.5     23.94     ~ 3 0
32 [SHM90] C1-V 5 RR* 00 33 04.56 +48 35 52.4     24.19     ~ 3 0
33 [SHM90] C1-V 4 RR* 00 33 04.86 +48 34 42.4     24.28     ~ 3 0
34 [SHM90] C1-V 3 RR* 00 33 07.07 +48 35 32.4     24.48     ~ 3 0
35 [YS2010] V20731 RR? 00 33 09.20 +48 28 21.6     25.459   25.024 ~ 1 0
36 [SHM90] C1-V 2 RR* 00 33 09.59 +48 35 48.4     24.24     ~ 3 0
37 [YS2010] V18304 RR? 00 33 09.60 +48 28 10.9     25.169   24.838 ~ 1 0
38 [YS2010] V20325 RR? 00 33 09.83 +48 28 11.7     25.293   25.015 ~ 1 0
39 [YS2010] V56641 RR? 00 33 11.18 +48 26 17.8     25.406   24.997 ~ 1 0
40 [YS2010] V15719 RR? 00 33 11.18 +48 28 06.1     25.072   24.319 ~ 1 0
41 [YS2010] V23104 RR? 00 33 11.66 +48 28 47.2     25.632   24.950 ~ 1 0
42 [YS2010] V20834 RR? 00 33 11.69 +48 28 50.6     25.309   24.721 ~ 1 0
43 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
44 [YS2010] V16803 RR? 00 33 12.61 +48 27 51.5     25.079   24.339 ~ 1 0
45 [SHM90] C1-V 1 RR* 00 33 12.70 +48 34 49.4     24.20     ~ 3 0
46 [YS2010] V24080 RR? 00 33 12.82 +48 28 57.0     25.657   25.438 ~ 1 0
47 [YS2010] V22251 RR? 00 33 13.13 +48 27 45.6     25.431   25.227 ~ 1 0
48 [YS2010] V22660 RR? 00 33 13.26 +48 28 37.3     25.392   25.237 ~ 1 0
49 [YS2010] V17600 RR? 00 33 13.28 +48 28 23.1     25.224   24.695 ~ 1 0
50 [YS2010] V18120 RR? 00 33 13.41 +48 28 50.2     25.137   24.600 ~ 1 0
51 [YS2010] V22308 RR? 00 33 13.43 +48 27 44.5     25.484   25.385 ~ 1 0
52 [YS2010] V57185 RR? 00 33 13.88 +48 26 36.3     25.519   24.805 ~ 1 0
53 [YS2010] V56535 RR? 00 33 14.15 +48 26 39.4     25.395   24.879 ~ 1 0
54 [YS2010] V58117 RR? 00 33 14.23 +48 26 14.8     25.639   25.329 ~ 1 0
55 [YS2010] V23505 RR? 00 33 14.28 +48 28 22.0     25.588   25.069 ~ 1 0
56 [YS2010] V22046 RR? 00 33 14.32 +48 28 27.7     25.389   24.942 ~ 1 0
57 [YS2010] V37537 RR? 00 33 14.89 +48 27 32.2     25.161   24.525 ~ 1 0
58 [YS2010] V57231 RR? 00 33 14.95 +48 25 51.2     25.498   24.848 ~ 1 0
59 [YS2010] V56868 RR? 00 33 14.99 +48 25 42.2     25.399   25.070 ~ 1 0
60 [YS2010] V38944 RR? 00 33 15.98 +48 27 20.2     25.303   24.765 ~ 1 0
61 [YS2010] V57831 RR? 00 33 16.45 +48 25 56.1     25.684   24.963 ~ 1 0
62 [YS2010] V38170 RR? 00 33 16.90 +48 27 08.8     25.234   24.550 ~ 1 0
63 [YS2010] V39591 RR? 00 33 17.03 +48 28 01.6     25.368   24.772 ~ 1 0
64 [YS2010] V41094 RR? 00 33 18.34 +48 27 10.2     25.568   25.156 ~ 1 0
65 [YS2010] V40378 RR? 00 33 18.59 +48 27 36.3     25.513   25.095 ~ 1 0
66 [YS2010] V41232 RR? 00 33 18.79 +48 27 21.5     25.600   25.166 ~ 1 0
67 [YS2010] V39668 RR? 00 33 19.29 +48 27 46.5     25.440   24.648 ~ 1 0
68 [YS2010] V38302 RR? 00 33 19.96 +48 27 53.7     25.300   24.573 ~ 1 0
69 [YS2010] V40264 RR? 00 33 20.47 +48 27 52.5     25.471   24.871 ~ 1 0
70 [YS2010] V40315 RR? 00 33 20.74 +48 27 36.2     25.510   24.914 ~ 1 0
71 [YS2010] V39906 RR? 00 33 21.73 +48 27 35.6     25.435   25.015 ~ 1 0
72 [YS2010] V38757 RR? 00 33 22.22 +48 27 43.2     25.317   25.147 ~ 1 0
73 [YS2010] V39451 RR? 00 33 23.75 +48 27 40.4     25.338   24.830 ~ 1 0
74 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
75 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
76 NAME Local Group GrG ~ ~           ~ 9325 0

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