2008ApJ...685..947P

Query : 2008ApJ...685..947P

2008ApJ...685..947P - Astrophys. J., 685, 947-957 (2008/October-1)

Variable stars in the Fornax dSph galaxy. II. Pulsating stars below the horizontal branch.

PORETTI E., CLEMENTINI G., HELD E.V., GRECO C., MATEO M., DELL'ARCIPRETE L., RIZZI L., GULLIEUSZIK M. and MAIO M.

Abstract (from CDS):

We have carried out an intensive survey of the northern region of the Fornax dwarf spheroidal galaxy with the aim of detecting the galaxy's short-period pulsating stars (P<0.25 days). Observations collected over three consecutive nights with the Wide Field Imager of the 2.2 m MPI telescope at ESO allowed us to detect 85 high-amplitude (0.20-1.00 mag in B light) variable stars with periods in the range from 0.046 to 0.126 days, similar to SX Phoenicis stars in Galactic metal-poor stellar populations. The plots of the observed periods vs. the B and V magnitudes show a dispersion largely exceeding the observational errors. To disentangle the matter, we separated the first-overtone from the fundamental-mode pulsators and tentatively identified a group of subluminous variables, about 0.35 mag fainter than the others. Their nature as either metal-poor intermediate-age stars or stars formed by the merging of close binary systems is discussed. The rich sample of the Fornax variables also led us to reconstruct the period-luminosity relation for short-period pulsating stars. An excellent linear fit, MV=-1.83(±0.08)-3.65(±0.07)logPF, was obtained using 153 δ Scuti and SX Phoenicis stars in a number of different stellar systems.

Abstract Copyright: ∼

Journal keyword(s): Stars: Blue Stragglers - Stars: Variables: δ Scuti - Galaxies: Distances and Redshifts - Galaxies: Individual: Name: Fornax - Stars: Variables: Other - Techniques: Photometric

VizieR on-line data: <Available at CDS (J/ApJ/685/947): table2.dat table3.dat>

Nomenclature: Table 2: [PCH2008] N-VNNNNN N=85.

Simbad objects: 157

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Number of rows : 157
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 V* T Phe Mi* 00 30 26.2337742744 -46 24 33.379722396   12.46 11.43 12.43   M7e 76 0
2 [PCH2008] 5-V26561 SX* 02 38 41.8 -34 14 37   23.54 23.13     ~ 1 0
3 [PCH2008] 5-V16343 SX* 02 38 42.1 -34 20 00   23.92 23.51     ~ 1 0
4 [PCH2008] 5-V6170 SX* 02 38 51.9 -34 24 47   23.27 22.95     ~ 2 0
5 [PCH2008] 5-V2985 SX* 02 38 58.8 -34 26 15   22.91 22.64     ~ 2 0
6 [PCH2008] 5-V2834 SX* 02 38 59.2 -34 26 19   22.98 22.67     ~ 2 0
7 [PCH2008] 5-V15474 SX* 02 39 02.6 -34 20 26   23.66 23.30     ~ 1 0
8 [PCH2008] 5-V510 SX* 02 39 07.2 -34 27 20   23.90 23.75     ~ 2 0
9 [PCH2008] 4-V813 SX* 02 39 08.3 -34 10 29   23.38 23.14     ~ 1 0
10 [PCH2008] 3-V5563 SX* 02 39 19.6 -34 07 58   24.05 23.86     ~ 2 0
11 [PCH2008] 6-V37380 SX* 02 39 20.6 -34 17 01   23.17 22.87     ~ 1 0
12 [PCH2008] 6-V44201 SX* 02 39 23.1 -34 14 45   23.70 23.47     ~ 2 0
13 [PCH2008] 6-V14592 SX* 02 39 25.6 -34 23 42   22.81       ~ 1 0
14 [PCH2008] 6-V44543 SX* 02 39 26.1 -34 14 37   23.67 23.31     ~ 1 0
15 [PCH2008] 6-V35797 SX* 02 39 26.7 -34 17 33   23.57 23.44     ~ 1 0
16 [PCH2008] 3-V6718 SX* 02 39 27.8 -34 07 16   23.81       ~ 1 0
17 [PCH2008] 6-V3640 SX* 02 39 28.4 -34 26 37   23.25 23.03     ~ 1 0
18 [PCH2008] 6-V38875 SX* 02 39 29.1 -34 16 32   23.41 23.18     ~ 1 0
19 [PCH2008] 6-V8812 SX* 02 39 31.0 -34 25 15   23.65 23.54     ~ 1 0
20 [PCH2008] 6-V39151 SX* 02 39 31.6 -34 16 26   23.85       ~ 1 0
21 [PCH2008] 6-V33971 SX* 02 39 34.2 -34 18 08   23.37 23.27     ~ 1 0
22 [PCH2008] 3-V17080 SX* 02 39 35.3 -33 59 20   23.64 23.34     ~ 1 0
23 [PCH2008] 3-V10893 SX* 02 39 40.3 -34 04 37   23.53 23.16     ~ 1 0
24 [PCH2008] 6-V10166 SX* 02 39 41.2 -34 24 54   23.03 22.73     ~ 2 0
25 [PCH2008] 6-V19089 SX* 02 39 42.2 -34 22 30   22.60 22.28     ~ 2 0
26 [PCH2008] 6-V18889 SX* 02 39 42.3 -34 22 33   23.23 22.96     ~ 2 0
27 [PCH2008] 6-V49021 SX* 02 39 43.0 -34 12 52   23.36 23.16     ~ 1 0
28 [PCH2008] 6-V5831 SX* 02 39 46.1 -34 26 02   23.48 23.01     ~ 1 0
29 [PCH2008] 6-V38403 SX* 02 39 46.8 -34 16 41   23.35 23.10     ~ 2 0
30 [PCH2008] 6-V40765 SX* 02 39 47.5 -34 15 53   23.71 23.46     ~ 2 0
31 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 131 0
32 [PCH2008] 6-V22746 SX* 02 39 50.7 -34 21 27   23.58 23.34     ~ 1 0
33 [PCH2008] 6-V15390 SX* 02 39 51.8 -34 23 30   24.13 23.97     ~ 2 0
34 [PCH2008] 6-V19268 SX* 02 39 52.7 -34 22 27   22.72 22.32     ~ 2 0
35 [PCH2008] 6-V37637 SX* 02 39 53.2 -34 16 56   23.33 23.07     ~ 1 0
36 [PCH2008] 6-V816 SX* 02 39 54.0 -34 27 21   22.60 22.28     ~ 2 0
37 [PCH2008] 7-V19493 SX* 02 39 59.2 -34 19 25   23.51 23.36     ~ 1 0
38 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
39 [PCH2008] 2-V5582 SX* 02 40 00.0 -34 08 11   23.63 23.44     ~ 2 0
40 [PCH2008] 7-V9132 SX* 02 40 01.4 -34 23 46   23.89 23.62     ~ 2 0
41 [PCH2008] 7-V35654 SX* 02 40 02.8 -34 12 23   23.41 23.25     ~ 1 0
42 [PCH2008] 7-V7347 SX* 02 40 04.0 -34 24 31   23.97 23.80     ~ 2 0
43 [PCH2008] 2-V11324 SX* 02 40 04.1 -34 05 00   23.84 23.66     ~ 1 0
44 [PCH2008] 7-V21373 SX* 02 40 05.0 -34 18 36   23.02 22.77     ~ 2 0
45 [PCH2008] 7-V15830 SX* 02 40 05.8 -34 20 58   23.72 23.50     ~ 2 0
46 [PCH2008] 7-V18358 SX* 02 40 07.0 -34 19 53   23.33 23.01     ~ 1 0
47 [PCH2008] 7-V1671 SX* 02 40 08.4 -34 26 52   23.12 22.99     ~ 2 0
48 [PCH2008] 7-V32007 SX* 02 40 08.5 -34 14 01   22.99 22.73     ~ 2 0
49 [PCH2008] 7-V6259 SX* 02 40 09.5 -34 24 58   23.33 23.20     ~ 1 0
50 [PCH2008] 2-V18380 SX* 02 40 11.8 -34 00 14   23.75 23.50     ~ 2 0
51 [PCH2008] 2-V8650 SX* 02 40 11.9 -34 06 30   23.66 23.55     ~ 1 0
52 [PCH2008] 2-V3796 SX* 02 40 12.1 -34 09 07   23.96 23.73     ~ 1 0
53 [PCH2008] 7-V5215 SX* 02 40 12.2 -34 25 24   23.43 23.16     ~ 2 0
54 [PCH2008] 2-V881 SX* 02 40 14.6 -34 10 38   23.72 23.38     ~ 2 0
55 [PCH2008] 7-V19309 SX* 02 40 14.9 -34 19 29   23.19 22.92     ~ 2 0
56 [PCH2008] 2-V7944 SX* 02 40 15.4 -34 06 54   23.90 23.64     ~ 1 0
57 [PCH2008] 7-V33186 SX* 02 40 16.5 -34 13 29   23.52 23.37     ~ 1 0
58 [PCH2008] 2-V16907 SX* 02 40 18.5 -34 01 20   23.88 23.54     ~ 1 0
59 [PCH2008] 2-V4387 SX* 02 40 19.8 -34 08 49   23.84 23.55     ~ 1 0
60 [PCH2008] 7-V2872 SX* 02 40 19.9 -34 26 23   23.92 23.58     ~ 1 0
61 [PCH2008] 7-V8618 SX* 02 40 20.2 -34 23 59   24.14 23.80     ~ 1 0
62 [PCH2008] 2-V1606 SX* 02 40 20.9 -34 10 16   23.49 23.30     ~ 1 0
63 [PCH2008] 7-V19699 SX* 02 40 21.0 -34 19 19   22.72 22.44     ~ 2 0
64 [PCH2008] 7-V4659 SX* 02 40 22.2 -34 25 38   23.12 22.95     ~ 2 0
65 [PCH2008] 2-V9849 SX* 02 40 23.6 -34 05 50   23.35 23.04     ~ 1 0
66 [PCH2008] 7-V34972 SX* 02 40 25.8 -34 12 41   23.22 23.10     ~ 1 0
67 [PCH2008] 7-V22094 SX* 02 40 26.2 -34 18 17   22.19 21.77     ~ 1 0
68 [PCH2008] 7-V25610 SX* 02 40 27.7 -34 16 47   22.76 22.67     ~ 1 0
69 [PCH2008] 7-V6056 SX* 02 40 28.8 -34 25 02   23.10 22.82     ~ 2 0
70 [PCH2008] 2-V7941 SX* 02 40 30.8 -34 06 54   23.13 22.82     ~ 2 0
71 [PCH2008] 2-V4169 SX* 02 40 31.3 -34 08 55   23.57 23.35     ~ 1 0
72 [PCH2008] 7-V13345 SX* 02 40 32.7 -34 22 00   23.24 22.98     ~ 2 0
73 [PCH2008] 7-V16899 SX* 02 40 35.6 -34 20 30   23.96 23.65     ~ 2 0
74 [PCH2008] 8-V4532 SX* 02 40 41.7 -34 25 29   23.14 22.75     ~ 2 0
75 [PCH2008] 8-V10941 SX* 02 40 42.0 -34 22 37   23.74 23.42     ~ 2 0
76 [PCH2008] 8-V1625 SX* 02 40 44.1 -34 26 46   22.92       ~ 1 0
77 [PCH2008] 8-V7020 SX* 02 40 44.3 -34 24 22   23.31 22.99     ~ 2 0
78 [PCH2008] 8-V10823 SX* 02 40 44.5 -34 22 40   22.97 22.61     ~ 2 0
79 [PCH2008] 8-V33331 SX* 02 40 47.8 -34 12 20   22.46 22.19     ~ 2 0
80 [PCH2008] 8-V9427 SX* 02 40 51.0 -34 23 17   23.43 23.09     ~ 1 0
81 [PCH2008] 1-V6694 SX* 02 41 06.3 -34 07 23   23.33 23.00     ~ 2 0
82 [PCH2008] 8-V28121 SX* 02 41 06.8 -34 14 48   23.61       ~ 1 0
83 [PCH2008] 8-V22313 SX* 02 41 10.9 -34 17 28   23.69 23.38     ~ 2 0
84 [PCH2008] 8-V18853 SX* 02 41 11.4 -34 19 02   23.09 22.80     ~ 1 0
85 [PCH2008] 8-V9899 SX* 02 41 14.2 -34 23 03   23.98       ~ 1 0
86 [PCH2008] 8-V20859 SX* 02 41 15.2 -34 18 08   23.42       ~ 1 0
87 [PCH2008] 8-V30859 SX* 02 41 16.4 -34 13 31   23.10 22.73     ~ 2 0
88 [PCH2008] 8-V9363 SX* 02 41 16.5 -34 23 17   23.35 23.00     ~ 1 0
89 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
90 [VM2013] DC-45 dS* 06 40 55.638 -51 00 42.92   23.41 23.06   22.72 ~ 8 0
91 [MHN98] V8 dS* 06 40 56.40 -50 59 39.8   23.44 23.23   22.79 ~ 8 0
92 [MHN98] V6 dS* 06 40 57.75 -51 00 11.4   23.10 22.79   22.40 ~ 8 0
93 [MHN98] V11 dS* 06 41 02.22 -50 58 54.7   23.00 22.75   22.36 ~ 8 0
94 [MHN98] V1 dS* 06 41 02.39 -51 01 53.3   22.97 22.70   22.54 ~ 8 0
95 [VM2013] DC-55 dS* 06 41 02.479 -51 00 25.78   23.27 22.99   22.65 ~ 8 0
96 [MHN98] V7 dS* 06 41 02.86 -50 59 40.4   23.53 23.20   22.74 ~ 8 0
97 [VM2013] DC-56 dS* 06 41 02.990 -50 58 40.69   23.06 22.65   22.59 ~ 8 0
98 [MHN98] V3 dS* 06 41 04.12 -51 01 14.7   23.21 22.92   22.40 ~ 8 0
99 [VM2013] DC-65 dS* 06 41 06.942 -50 59 18.39   23.18 23.03   22.57 ~ 8 0
100 [MHN98] V2 dS* 06 41 09.57 -51 01 20.6   23.43 23.10   22.73 ~ 8 0
101 [VM2013] DC-78 dS* 06 41 14.321 -50 59 32.85   23.09 22.75   22.41 ~ 8 0
102 [VM2013] DC-83 dS* 06 41 15.910 -50 55 43.94   23.16 22.92   22.56 ~ 7 0
103 [VM2013] DC-90 dS* 06 41 18.051 -50 56 40.45   22.70 22.49   22.02 ~ 8 0
104 [VM2013] DC-132 dS* 06 41 29.451 -50 57 39.10   23.27 22.95   22.56 ~ 8 0
105 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
106 [VM2013] DC-202 dS* 06 41 46.478 -50 55 10.70   23.14 22.91   22.52 ~ 8 0
107 [MHN98] V19 dS* 06 41 55.20 -50 56 15.4   22.90 22.63   22.17 ~ 8 0
108 [VM2013] DC-242 dS* 06 41 57.151 -50 56 11.76   22.81 22.54   22.11 ~ 8 0
109 [VM2013] DC-251 dS* 06 42 00.068 -50 55 52.14   23.26 23.05   22.57 ~ 8 0
110 RL 149 HS* 07 24 14.3741784768 -00 33 04.165016904 12.958 13.737 13.866 13.906 13.974 sdB 114 0
111 PN G219.2+07.5 PN 07 29 58.4752358832 -02 06 37.601058600 11.749 12.830 13.017 13.076 13.164 sdO 82 0
112 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
113 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
114 Cl* NGC 5139 SAW V237 SX* 13 25 52.86 -47 23 55.9 17.162 17.215 16.828 16.477 16.295 ~ 12 0
115 Cl* NGC 5139 SAW V324 SX* 13 26 18.146 -47 30 35.29 16.367 16.558 16.424 16.238 15.996 ~ 6 0
116 Cl* NGC 5139 SAW V199 SX* 13 26 28.6293715104 -47 28 38.291634480 17.218 16.881 16.707 16.418 16.191 ~ 12 0
117 Cl* NGC 5139 SAW V326 SX* 13 26 40.169 -47 24 55.70 17.470 17.348 16.985 16.763 16.478 ~ 7 0
118 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
119 Cl* NGC 5139 SAW V220 SX* 13 26 48.613 -47 21 42.41 17.294 17.318 16.981 16.779 16.488 ~ 13 0
120 Cl* NGC 5139 SAW V298 SX* 13 26 50.235 -47 34 03.49 17.744 17.728 17.361 17.178 16.876 ~ 6 0
121 Cl* NGC 5139 SAW V225 SX* 13 27 02.288 -47 24 36.88 17.350 17.163 16.979 16.685 16.514 ~ 13 0
122 Cl* NGC 5139 SAW V200 SX* 13 27 06.9121797192 -47 26 10.377966552 17.263 17.343 16.807 16.631 16.355 ~ 10 0
123 Cl* NGC 5139 SAW V204 SX* 13 27 07.907 -47 37 05.46   17.145 17.050 16.657 16.499 ~ 13 0
124 Cl* NGC 5139 SAW V306 SX* 13 27 10.996 -47 28 24.68 18.181 18.020 17.635 17.398 17.111 ~ 7 0
125 [MLF2014] 138261 SX* 13 27 15.6347569728 -47 24 34.802237124 17.075 17.056 16.711 16.511 16.202 ~ 25 0
126 Cl* NGC 5139 SAW V231 SX* 13 27 19.042 -47 35 54.31 17.729 17.714 17.435 17.203 16.971 ~ 14 0
127 [SP2014] NGC5139 BSS45 SX* 13 27 22.131 -47 27 52.23 17.633 17.559 17.228 17.006 16.790 ~ 14 0
128 Cl* NGC 5139 SAW V252 SX* 13 27 29.79 -47 28 58.7 17.738 17.783 17.420 17.127 16.874 ~ 13 0
129 [MLF2014] 101099 SX* 13 27 31.7531352792 -47 35 42.091250532 17.677 17.782 17.431 17.151 16.931 ~ 13 0
130 Cl* NGC 5139 SAW V238 SX* 13 27 33.961 -47 29 23.35 17.638 17.668 17.327   16.861 ~ 13 0
131 Cl* NGC 5139 NJL 220 SX* 13 27 53.9512621104 -47 31 54.255670536 17.371 17.547 16.994 16.817 16.559 ~ 25 0
132 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
133 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
134 Cl* NGC 6809 MFRBS 57 SX* 19 39 45.4829853011 -30 56 03.571861191 17.532 17.387 17.034 16.832 16.610 ~ 10 0
135 Cl* NGC 6809 MFRBS 63 SX* 19 39 47.0514328267 -30 57 34.888095664 16.548 16.540 16.073 15.857 15.553 ~ 9 0
136 Cl* NGC 6809 MFRBS 53 SX* 19 39 48.5571995028 -30 56 45.931823341 17.224 17.031 16.721 16.549 16.308 ~ 9 0
137 Cl* NGC 6809 MFRBS 55 SX* 19 39 49.87 -30 57 42.5   17.26 16.96     ~ 8 0
138 Cl* NGC 6809 MFRBS 52 SX* 19 39 50.39 -30 55 12.1   16.91 16.57     ~ 9 0
139 Cl* NGC 6809 MFRBS 50 SX* 19 39 51.55 -30 56 21.3   16.21 15.88     ~ 8 0
140 Cl* NGC 6809 MFRBS 62 SX* 19 39 51.8151125905 -30 55 53.728144254 17.636 17.571 17.230 17.033 16.767 ~ 9 0
141 Cl* NGC 6809 MFRBS 24 SX* 19 39 54.11 -30 58 06.0   17.47 17.13     ~ 9 0
142 Cl* NGC 6809 MFRBS 51 SX* 19 39 54.5558346471 -30 59 58.817810494 16.816 16.762 16.398 16.171 15.925 ~ 10 0
143 Cl* NGC 6809 MFRBS 23 SX* 19 39 54.9503200669 -30 58 22.195973253 17.414 17.341 17.001 16.794 16.560 ~ 10 0
144 Cl* NGC 6809 MFRBS S12 SX* 19 39 57.67 -30 57 01.3   17.64 17.33     ~ 9 0
145 Cl* NGC 6809 MFRBS 21 SX* 19 39 58.14 -30 58 32.7   17.27 16.95     ~ 9 0
146 Cl* NGC 6809 MFRBS 25 SX* 19 39 58.6122573530 -30 57 24.851307402 17.622 17.459 17.151 16.989 16.781 ~ 9 0
147 Cl* NGC 6809 MFRBS 20 SX* 19 39 58.88 -30 58 15.6   17.11 16.71     ~ 10 0
148 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
149 Cl* NGC 6809 MFRBS 11 SX* 19 40 00.99 -30 57 56.5   17.63 17.28     ~ 10 0
150 Cl* NGC 6809 MFRBS 61 SX* 19 40 01.02 -31 00 37.9   17.54 17.24     ~ 8 0
151 Cl* NGC 6809 MFRBS 60 SX* 19 40 01.8928382682 -30 55 39.096281940 17.644 17.544 17.220 17.049 16.789 ~ 10 0
152 Cl* NGC 6809 MFRBS 10 SX* 19 40 02.9504061822 -30 58 29.287878475 17.058 16.854 16.536 16.327 16.111 ~ 11 0
153 Cl* NGC 6809 MFRBS 22 SX* 19 40 06.8713104239 -30 56 33.033552217 17.356 17.310 16.970 16.768 16.533 ~ 10 0
154 Cl* NGC 6809 MFRBS 54 SX* 19 40 07.80 -31 00 12.6   17.11 16.81     ~ 8 0
155 Cl* NGC 6809 MFRBS 56 SX* 19 40 09.1973370069 -30 56 42.970401919 17.355 17.322 16.939 16.686 16.428 ~ 10 0
156 Cl* NGC 6809 MFRBS 58 SX* 19 40 11.33 -30 59 25.1   17.52 17.19     ~ 8 0
157 Cl* NGC 6809 MFRBS 59 SX* 19 40 11.9920245336 -31 02 05.420166684 17.588 17.510 17.191 17.003 16.786 ~ 8 0

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