2012AJ....144..113C

Query : 2012AJ....144..113C

2012AJ....144..113C - Astron. J., 144, 113 (2012/October-0)

Blending of Cepheids in M33.

CHAVEZ J.M., MACRI L.M. and PELLERIN A.

Abstract (from CDS):

A precise and accurate determination of the Hubble constant based on Cepheid variables requires proper characterization of many sources of systematic error. One of these is stellar blending, which biases the measured fluxes of Cepheids and the resulting distance estimates. We study the blending of 149 Cepheid variables in M33 by matching archival Hubble Space Telescope data with images obtained at the Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5 m telescope, which differ by a factor of 10 in angular resolution. We find that 55%±4% of the Cepheids have no detectable nearby companions that could bias the WIYN V-band photometry, while the fraction of Cepheids affected below the 10% level is 73%±4%. The corresponding values for the I band are 60%±4% and 72%±4%, respectively. We find no statistically significant difference in blending statistics as a function of period or surface brightness. Additionally, we report all the detected companions within 2'' of the Cepheids (equivalent to 9 pc at the distance of M33) which may be used to derive empirical blending corrections for Cepheids at larger distances.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: M33 - stars: variables: Cepheids

VizieR on-line data: <Available at CDS (J/AJ/144/113): table2.dat table3.dat>

Simbad objects: 153

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Number of rows : 153
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 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
3 M33SSS J013302.03+302553.4 Ce* 01 33 02.03 +30 25 53.4   22.703 21.804   20.520 ~ 2 0
4 M33SSS J013304.62+302537.4 Ce* 01 33 04.5621413448 +30 25 37.240661640   22.271 21.357   20.573 ~ 2 0
5 M33SSS J013307.09+302530.7 Ce* 01 33 07.09 +30 25 30.7   22.301 21.504   20.594 ~ 2 0
6 M33SSS J013307.46+302512.6 Ce* 01 33 07.46 +30 25 12.6   22.479 21.787   20.972 ~ 2 0
7 M33SSS J013308.37+302607.0 Ce* 01 33 08.37 +30 26 07.0   22.245 21.496   20.983 ~ 2 0
8 M33SSS J013309.08+302354.6 Ce* 01 33 09.08 +30 23 54.6   23.007 22.525   21.623 ~ 2 0
9 M33SSS J013312.30+302355.7 Ce* 01 33 12.30 +30 23 55.7   21.986 21.345   20.691 ~ 2 0
10 M33SSS J013312.65+303411.7 Ce* 01 33 12.65 +30 34 11.7   20.539 20.359   19.747 ~ 2 0
11 M33SSS J013315.71+303319.3 Ce* 01 33 15.6803547576 +30 33 19.022603220   21.863 21.373   20.518 ~ 2 0
12 M33SSS J013316.08+302051.8 Ce* 01 33 16.08 +30 20 51.8   22.042 21.531   20.780 ~ 2 0
13 M33SSS J013316.88+302157.9 Ce* 01 33 16.88 +30 21 57.9   22.902 22.345   21.564 ~ 2 0
14 M33SSS J013318.09+302107.1 Ce* 01 33 18.0349196904 +30 21 06.915273300   21.100 20.075   19.099 ~ 2 0
15 M33SSS J013319.10+303305.6 Ce* 01 33 19.10 +30 33 05.6     21.703   20.814 ~ 2 0
16 M33SSS J013320.20+303519.5 Ce* 01 33 20.1792365760 +30 35 19.336622928   21.530 20.669   19.811 ~ 2 0
17 M33SSS J013320.60+303458.4 Ce* 01 33 20.5659521976 +30 34 58.269149724   20.613 20.563   20.074 ~ 3 0
18 M33SSS J013321.16+303116.4 Ce* 01 33 21.1192706184 +30 31 15.892484304   22.109 20.927   19.714 ~ 2 0
19 M33SSS J013321.51+302132.0 Ce* 01 33 21.4673294832 +30 21 31.916856564   21.683 21.224   20.489 ~ 2 0
20 M33SSS J013321.78+303234.9 Ce* 01 33 21.78 +30 32 34.9   22.396 21.589   20.811 ~ 2 0
21 M33SSS J013322.10+303731.9 Ce* 01 33 22.0546004136 +30 37 31.765573056   21.636 21.051   20.311 ~ 2 0
22 M33SSS J013322.63+303454.9 cC* 01 33 22.6056772111 +30 34 54.714562233   21.213 20.269   19.184 ~ 3 0
23 [SC83] D54 Ce* 01 33 22.9205384160 +30 30 39.744255672   21.248 20.810   19.763 ~ 5 0
24 M33SSS J013323.04+303216.4 Ce* 01 33 23.0032756392 +30 32 16.170717948   21.716 21.010   20.085 ~ 2 0
25 M33SSS J013324.20+302248.9 Ce* 01 33 24.20 +30 22 48.9   22.375 21.779   21.013 ~ 2 0
26 [SM2006] W30304 Ce* 01 33 24.63 +30 35 17.8   21.201 20.133   19.013 ~ 7 0
27 M33SSS J013325.56+303427.3 cC* 01 33 25.5401758752 +30 34 27.050867940   20.925 20.330   19.551 ~ 4 0
28 M33SSS J013325.62+303510.8 Ce* 01 33 25.62 +30 35 10.8   22.111 21.392   20.538 ~ 2 0
29 M33SSS J013325.71+302138.7 Ce* 01 33 25.71 +30 21 38.7   22.401 21.654   20.702 ~ 2 0
30 M33SSS J013326.01+303742.3 Ce* 01 33 25.9811303544 +30 37 42.206583288   21.584 21.119   20.500 ~ 2 0
31 D33 J013326.2+303319.4 cC* 01 33 26.0680364256 +30 33 19.746666684   21.276 20.333   19.292 ~ 7 0
32 M33SSS J013326.71+303112.5 cC* 01 33 26.6723799744 +30 31 12.423237492   21.280 20.685   19.819 ~ 3 0
33 M33SSS J013327.07+303959.9 Ce* 01 33 27.07 +30 39 59.9     21.927   20.860 ~ 2 0
34 [SM2006] W30344 Ce* 01 33 27.3149480472 +30 35 51.275865948   21.523 20.747   19.924 ~ 4 0
35 VHK 31 Ce* 01 33 27.4275557688 +30 37 07.632293052   20.213 19.268   18.224 ~ 7 0
36 M33SSS J013327.68+303423.8 cC* 01 33 27.6509526721 +30 34 23.591916974   19.983 19.619   18.921 ~ 5 0
37 M33SSS J013328.37+303730.9 Ce* 01 33 28.3325991960 +30 37 30.205666452   21.633 21.231   20.417 ~ 2 0
38 M33SSS J013328.75+303131.6 Ce* 01 33 28.7069305824 +30 31 31.491512616   22.306 21.521   20.531 ~ 2 0
39 M33SSS J013328.78+303440.3 Ce* 01 33 28.7466889704 +30 34 40.075689828   21.434 20.837   20.078 ~ 3 0
40 M33SSS J013328.77+303753.4 Ce* 01 33 28.77 +30 37 53.4   21.990 21.274   20.460 ~ 2 0
41 M33SSS J013328.85+302259.1 cC* 01 33 28.8091649928 +30 22 58.977486840   21.272 20.430   19.380 ~ 3 0
42 D33 J013329.3+303744.4 cC* 01 33 29.2057730856 +30 37 44.739749496   20.640 19.378   18.184 ~ 10 0
43 M33SSS J013329.22+303136.0 Ce* 01 33 29.22 +30 31 36.0   22.068 21.451   20.564 ~ 3 0
44 M33SSS J013329.28+303100.2 Ce* 01 33 29.2442312328 +30 31 00.159668004   22.215 21.269   19.901 ~ 2 0
45 D33 J013329.5+303556.9 cC* 01 33 29.4283925256 +30 35 57.349390272   20.630 19.698   18.711 ~ 10 0
46 M33SSS J013329.48+303614.3 Ce* 01 33 29.48 +30 36 14.3   21.822 21.339   20.649 ~ 2 0
47 M33SSS J013329.58+303108.7 Ce* 01 33 29.5426514568 +30 31 08.603328792   21.605 20.689   19.627 ~ 2 0
48 M33SSS J013329.84+303452.9 Ce* 01 33 29.8079406624 +30 34 52.704562836   21.607 21.023   20.101 ~ 3 0
49 D33 J013330.2+303637.4 cC* 01 33 30.0894128976 +30 36 38.016039708   21.029 19.941   18.996 ~ 9 0
50 M33SSS J013330.15+303803.9 cC* 01 33 30.1268014272 +30 38 04.027844544   20.784 20.354   19.258 ~ 5 0
51 M33SSS J013330.39+303555.5 cC* 01 33 30.3519724272 +30 35 55.365205524   20.482 19.613   18.788 ~ 5 0
52 M33SSS J013330.80+303111.3 cC* 01 33 30.7593492951 +30 31 11.237564389   21.605 20.741   19.620 ~ 4 0
53 M33SSS J013330.94+303051.1 Ce* 01 33 30.94 +30 30 51.1   22.666 21.675   20.652 ~ 2 0
54 VHK 14 cC* 01 33 31.0278285288 +30 31 43.437093852   20.538 19.314   18.119 ~ 8 0
55 D33 J013331.4+303016.3 Ce* 01 33 31.3416689520 +30 30 16.777853460   21.455 20.40   19.21 ~ 3 0
56 D33 J013331.7+302904.7 Ce* 01 33 31.6013103088 +30 29 05.217759906   20.286 20.04   19.57 ~ 3 0
57 M33SSS J013331.65+303931.4 cC* 01 33 31.6123285992 +30 39 31.253791032   20.893 20.243   19.414 ~ 5 0
58 [SM2006] W30569 Ce* 01 33 32.1261060672 +30 39 45.603077220   21.504 20.552   19.639 ~ 4 0
59 D33 J013332.2+303001.9 Ce* 01 33 32.14 +30 30 02.3   21.942 21.384   20.689 ~ 5 0
60 M33SSS J013332.36+302819.8 Ce* 01 33 32.36 +30 28 19.8   22.472 22.004   21.152 ~ 2 0
61 D33 J013332.4+303143.3 Ce* 01 33 32.41 +30 31 43.7   22.393 21.546   20.33 ~ 6 0
62 D33 J013332.9+303548.4 cC* 01 33 32.8723349021 +30 35 48.826334844   20.772 19.52   18.57 ~ 10 0
63 M33SSS J013333.08+304230.8 Ce* 01 33 33.08 +30 42 30.8   22.186 21.457   20.332 ~ 3 0
64 D33 J013333.3+303747.1 Ce* 01 33 33.2319545376 +30 37 47.406830412   22.329 20.59   19.37 ~ 5 0
65 M33SSS J013334.21+304725.7 cC* 01 33 34.1697462792 +30 47 25.822845636   21.292 20.572   19.808 ~ 4 0
66 D33 J013334.4+303530.2 Ce* 01 33 34.38 +30 35 30.7   20.39 19.84   18.89 ~ 5 0
67 D33 J013335.6+303649.2 Ce* 01 33 35.5182931056 +30 36 49.568880708   21.842 20.943   20.143 ~ 6 0
68 D33 J013336.3+303730.7 Ce* 01 33 36.2311614624 +30 37 31.001727504   22.018 21.242   19.935 ~ 5 0
69 M33SSS J013336.71+304916.9 Ce* 01 33 36.71 +30 49 16.9   21.653 20.878   19.796 ~ 2 0
70 M33SSS J013338.25+304251.0 Ce* 01 33 38.25 +30 42 51.0   22.419 21.574   20.490 ~ 3 0
71 M33SSS J013338.39+304751.3 Ce* 01 33 38.3598651504 +30 47 51.467477316   21.599 20.456   19.303 ~ 2 0
72 D33 J013338.8+303751.1 cC* 01 33 38.7641756760 +30 37 51.189141504   22.010 21.005   19.895 ~ 6 0
73 M33SSS J013339.67+302709.0 cC* 01 33 39.6301088568 +30 27 08.808526296   21.020 20.369   19.528 ~ 3 0
74 D33 J013340.3+304741.7 Ce* 01 33 40.1361004776 +30 47 40.272373032   21.95 20.94   19.97 ~ 4 0
75 D33 J013341.1+304340.7 Ce* 01 33 40.9962447792 +30 43 39.886393548   21.623 20.880   20.142 ~ 3 0
76 D33 J013341.2+303550.0 cC* 01 33 41.1681505097 +30 35 50.215276372   21.120 19.937   18.68 ~ 6 0
77 M33SSS J013341.22+304754.8 Ce* 01 33 41.1962615640 +30 47 54.799789128   21.482 20.550   19.918 ~ 2 0
78 D33 J013341.5+304737.7 Ce* 01 33 41.39 +30 47 36.4   22.504 21.817   20.926 ~ 4 0
79 D33 J013341.8+304312.2 Ce* 01 33 41.67 +30 43 11.5   22.53 21.448   20.554 ~ 5 0
80 D33 J013341.9+302951.8 Ce* 01 33 41.8712129184 +30 29 51.597072744   21.918 21.091   20.134 ~ 5 0
81 M33SSS J013342.17+304841.0 Ce* 01 33 42.17 +30 48 41.0     21.885   21.050 ~ 2 0
82 D33 J013342.2+303747.0 cC* 01 33 42.2305990373 +30 37 47.164656053   20.822 20.211   19.406 ~ 5 0
83 D33 J013346.6+304741.7 Ce* 01 33 46.45 +30 47 40.5   21.899 21.202   20.257 ~ 3 0
84 D33 J013346.6+304645.9 Ce* 01 33 46.5089906592 +30 46 44.922237852   20.73 19.79   18.95 ~ 6 0
85 D33 J013347.2+303536.2 Ce* 01 33 47.1645862776 +30 35 36.321132588   21.045 19.84   18.87 ~ 6 0
86 D33 J013348.2+303800.1 cC* 01 33 48.1744779644 +30 37 59.997335960   21.145 20.303   19.26 ~ 6 0
87 D33 J013348.8+303045.0 Ce* 01 33 48.7538151336 +30 30 44.711742780   22.116 21.26   20.26 ~ 5 0
88 M33SSS J013348.86+303415.9 Ce* 01 33 48.86 +30 34 15.9   21.448 20.863   19.942 ~ 3 0
89 D33 J013349.2+303218.1 Ce* 01 33 49.2493275384 +30 32 17.885223636   22.040 21.190   20.145 ~ 5 0
90 D33 J013349.6+304744.7 Ce* 01 33 49.55 +30 47 43.7   22.626 21.730   20.718 ~ 6 0
91 D33 J013349.8+303758.7 Ce* 01 33 49.83 +30 37 58.7   21.311 20.539   19.731 ~ 7 0
92 D33 J013350.6+304754.7 Ce* 01 33 50.4731217072 +30 47 53.629996776   21.473 20.02   18.73 ~ 6 0
93 D33 J013350.6+303445.8 Ce* 01 33 50.6234015544 +30 34 45.730630056   22.114 21.297   20.286 ~ 6 0
94 D33 J013350.8+304715.5 cC* 01 33 50.6344985256 +30 47 14.486618148   21.38 20.802   20.045 ~ 7 0
95 D33 J013350.7+303544.2 cC* 01 33 50.7225140760 +30 35 44.262963060   21.297 19.96   18.95 ~ 10 0
96 D33 J013350.9+303336.1 Ce* 01 33 50.8589898984 +30 33 35.997354648   21.48 20.56   19.10 ~ 5 0
97 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
98 M33SSS J013350.94+303117.4 Ce* 01 33 50.94 +30 31 17.4   22.543 21.735   20.832 ~ 3 0
99 M33SSS J013350.99+303156.4 Ce* 01 33 50.9504491512 +30 31 56.165146068   21.226 20.701   20.369 ~ 2 0
100 D33 J013351.8+303310.6 Ce* 01 33 51.82 +30 33 10.9   22.49 21.516   20.731 ~ 4 0
101 D33 J013352.4+303844.2 cC* 01 33 52.4402010666 +30 38 44.082599552   20.527 19.380   18.20 ~ 9 0
102 D33 J013352.7+303416.2 Ce* 01 33 52.7529277872 +30 34 16.269587400   22.012 21.243   19.42 ~ 4 0
103 D33 J013353.4+303308.5 Ce* 01 33 53.4154013160 +30 33 08.338332060   22.170 21.416   20.373 ~ 5 0
104 D33 J013353.4+303535.3 cC* 01 33 53.4359872575 +30 35 35.272820572   21.003 19.76   19.01 ~ 9 0
105 M33SSS J013353.70+303152.0 Ce* 01 33 53.70 +30 31 52.0     21.455   20.545 ~ 2 0
106 2MASS J01335422+3041108 cC* 01 33 54.2520489664 +30 41 10.592554719   20.106 19.17   18.538 ~ 6 0
107 D33 J013354.8+304106.5 cC* 01 33 54.7510915004 +30 41 06.005085564   20.12 19.23   18.22 ~ 9 0
108 D33 J013355.0+303537.0 Ce* 01 33 55.02 +30 35 37.2   21.312 20.680   19.66 ~ 5 0
109 D33 J013356.1+303903.0 cC* 01 33 56.0959879636 +30 39 02.872479151   22.090 21.014   19.853 ~ 7 0
110 D33 J013356.1+303803.9 Ce* 01 33 56.13 +30 38 03.9   22.132 21.371   20.334 ~ 4 0
111 D33 J013357.4+304113.9 Ce* 01 33 57.37 +30 41 13.3   20.927 20.34   19.35 ~ 6 0
112 D33 J013357.6+303805.4 cC* 01 33 57.5813352432 +30 38 05.274927132   21.148 20.554   19.868 ~ 6 0
113 D33 J013358.6+303316.6 cC* 01 33 58.6717580250 +30 33 16.490557773   21.240 20.775   20.009 ~ 5 0
114 D33 J013358.8+303719.7 cC* 01 33 58.8255892056 +30 37 19.692195060   21.196 20.09   18.88 ~ 8 0
115 D33 J013359.4+303226.7 Ce* 01 33 59.4366743616 +30 32 26.481164388   20.78 19.866   18.52 ~ 6 0
116 D33 J013359.8+303800.0 Ce* 01 33 59.8576390296 +30 37 59.958363108   21.790 21.297   20.576 ~ 5 0
117 D33 J013400.5+303630.8 Ce* 01 34 00.58 +30 36 30.6   21.897 21.166   20.252 ~ 4 0
118 D33 J013401.2+303113.7 cC* 01 34 01.1961715224 +30 31 13.402671456 19.937 20.043 19.096 18.695 18.29 ~ 10 0
119 D33 J013401.7+303923.1 cC* 01 34 01.7478140827 +30 39 22.706269532   21.335 20.602   19.318 ~ 9 0
120 D33 J013401.9+304148.9 Ce* 01 34 01.87 +30 41 48.3   22.294 21.473   20.443 ~ 4 0
121 D33 J013402.1+303741.9 Ce* 01 34 02.19 +30 37 41.8   21.642 20.971   20.336 ~ 4 0
122 D33 J013402.4+303831.8 Ce* 01 34 02.4502241808 +30 38 31.746696432   21.243 20.80   20.163 ~ 5 0
123 D33 J013402.5+303628.0 cC* 01 34 02.5690445520 +30 36 28.139333220   21.252 20.43   19.50 ~ 7 0
124 2MASS J01340384+3039120 Ce* 01 34 03.84 +30 39 12.0   21.182 19.64   18.28 ~ 4 0
125 D33 J013404.3+304115.7 Ce* 01 34 04.26 +30 41 15.0   21.965 21.244   20.495 ~ 5 0
126 D33 J013405.1+303851.4 cC* 01 34 05.1259873104 +30 38 51.044478396   20.363 18.99   17.84 ~ 9 0
127 M33SSS J013405.93+303819.2 Ce* 01 34 05.9021146464 +30 38 19.179779604   21.990 21.120   20.240 ~ 3 0
128 D33 J013405.9+303928.9 cC* 01 34 05.9022012264 +30 39 28.343550708   20.615 20.01   19.32 ~ 7 0
129 D33 J013405.9+303453.8 Ce* 01 34 05.9645473152 +30 34 53.513959908   21.11 21.230   20.04 ~ 4 0
130 D33 J013406.1+303734.0 Ce* 01 34 06.1005536808 +30 37 33.843022860   21.699 21.06   19.71 ~ 5 0
131 D33 J013406.6+303816.8 cC* 01 34 06.5624034096 +30 38 16.542470112   21.411 20.29   19.785 ~ 7 0
132 D33 J013406.8+303940.2 Ce* 01 34 06.7586211504 +30 39 39.814671384   20.65 19.84   18.96 ~ 7 0
133 D33 J013407.9+303831.6 Ce* 01 34 07.9047843960 +30 38 31.123386132   21.252 20.31   19.82 ~ 6 0
134 D33 J013408.1+303931.9 Ce* 01 34 08.1266626344 +30 39 31.706343756   21.148 20.664   19.790 ~ 5 0
135 D33 J013408.4+303817.2 Ce* 01 34 08.40 +30 38 17.0   20.683 20.24   19.20 ~ 4 0
136 D33 J013408.6+303754.8 Ce* 01 34 08.64 +30 37 54.7   22.085 21.435   20.969 ~ 5 0
137 D33 J013408.8+303946.5 Ce* 01 34 08.7982029480 +30 39 46.068680448   21.333 20.56   19.52 ~ 6 0
138 D33 J013410.2+303407.8 Ce* 01 34 10.2344002056 +30 34 07.577932188   21.836 20.64   19.44 ~ 4 0
139 D33 J013413.4+303317.7 Ce* 01 34 13.3979442576 +30 33 17.598346452   22.240 21.264   19.98 ~ 5 0
140 M33SSS J013413.89+303212.2 Ce* 01 34 13.8446988792 +30 32 11.924923524   21.986 21.047   20.247 ~ 3 0
141 LGGS J013414.25+302750.4 cC* 01 34 14.2205319261 +30 27 50.175618693 20.908 20.310 19.636 19.035 18.418 K/MI+B 4 0
142 D33 J013417.6+303819.7 cC* 01 34 17.5025396026 +30 38 19.419946388   21.188 20.37   19.20 ~ 4 0
143 M33SSS J013418.46+310009.5 cC* 01 34 18.4273841688 +31 00 09.514044324   20.508 19.732   18.646 ~ 3 0
144 M33SSS J013425.11+303541.4 Ce* 01 34 25.0768525992 +30 35 41.238780612   21.539 20.918   20.146 ~ 2 0
145 M33SSS J013426.32+303827.6 Ce* 01 34 26.32 +30 38 27.6   21.763 20.817   19.826 ~ 2 0
146 D33 J013428.8+304820.6 Ce* 01 34 28.61 +30 48 20.7   22.860 21.898   21.182 ~ 3 0
147 M33SSS J013428.70+303723.6 Ce* 01 34 28.6651199136 +30 37 23.491739280   21.461 21.055   20.263 ~ 2 0
148 M33SSS J013429.09+303735.1 Ce* 01 34 29.09 +30 37 35.1   21.992 21.518   20.658 ~ 2 0
149 M33SSS J013429.88+304754.1 Ce* 01 34 29.8574679024 +30 47 54.031961292   21.612 20.751   20.014 ~ 3 0
150 M33SSS J013431.00+303703.8 Ce* 01 34 31.00 +30 37 03.8   22.292 21.434   20.523 ~ 2 0
151 M33SSS J013433.62+303855.8 Ce* 01 34 33.62 +30 38 55.8   22.609 21.776   20.629 ~ 2 0
152 M33SSS J013437.42+304747.7 Ce* 01 34 37.42 +30 47 47.7   22.185 21.589   20.665 ~ 2 0
153 NAME Local Group GrG ~ ~           ~ 9325 0

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