2005ApJ...634.1020B

Query : 2005ApJ...634.1020B

2005ApJ...634.1020B - Astrophys. J., 634, 1020-1031 (2005/December-1)

The Araucaria project: the effect of blending on the Cepheid distance to NGC 300 from Advanced Camera for Surveys images.

BRESOLIN F., PIETRZYNSKI G., GIEREN W. and KUDRITZKI R.-P.

Abstract (from CDS):

We have used the Advanced Camera for Surveys aboard the Hubble Space Telescope (HST) to obtain F435W, F555W, and F814W single-epoch images of six fields in the spiral galaxy NGC 300. Taking advantage of the superb spatial resolution of these images, we have tested the effect that blending of the Cepheid variables studied from the ground with close stellar neighbors, unresolved on the ground-based images, has on the distance determination to NGC 300. Out of the 16 Cepheids included in this study, only three are significantly affected by nearby stellar objects. After correcting the ground-based magnitudes for the contribution by these projected companions to the observed flux, we find that the corresponding period-luminosity relations in V, I, and the Wesenheit magnitude WIare not significantly different from the relations obtained without corrections. We fix an upper limit of 0.04 mag to the systematic effect of blending on the distance modulus to NGC 300. As part of our HST imaging program, we present improved photometry for 40 blue supergiants in NGC 300.

Abstract Copyright: ∼

Journal keyword(s): Stars: Variables: Cepheids - Cosmology: Distance Scale - Galaxies: Distances and Redshifts - Galaxies: Individual: NGC Number: NGC 300 - Galaxies: Stellar Content

Simbad objects: 62

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Number of rows : 62
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 [BGK2002] C12 * 00 54 18.050 -37 36 09.71   20.18 20.16     B9.5 4 0
3 [PGF2002] cep067 Ce* 00 54 20.01 -37 38 32.8   23.20 22.31     ~ 3 0
4 [BGK2002] C9 * 00 54 21.294 -37 35 17.93   20.27 20.25     B9 3 0
5 [BGK2002] C11 * 00 54 21.331 -37 35 56.24   19.65 19.66     B4 2 0
6 [BGK2002] D18 * 00 54 21.804 -37 46 04.60   19.82 19.83     B9 3 0
7 [BGK2002] C15 * 00 54 22.197 -37 37 44.98   20.78 20.99     B2 2 0
8 [BGK2002] C17 V* 00 54 22.528 -37 38 25.50   21.10 20.97     ~ 3 0
9 [PGF2002] cep051 Ce* 00 54 22.63 -37 34 48.0   23.25 22.20     ~ 3 0
10 [PGF2002] cep074 Ce* 00 54 23.07 -37 35 42.2   22.80 22.09     ~ 3 0
11 [BGK2002] C8 * 00 54 23.455 -37 35 07.01   20.00 20.05     B9 4 0
12 MWMM V8 Ce* 00 54 23.79 -37 41 04.5     21.20     ~ 9 0
13 [BGK2002] C19 * 00 54 24.039 -37 39 17.13   19.74 19.76     B2.5 2 0
14 MWMM V9 Ce* 00 54 25.00 -37 37 57.7     19.90     ~ 9 0
15 [BGK2002] D5 * 00 54 25.597 -37 41 03.44   19.92 19.97     B4 2 0
16 [BGK2002] C18 * 00 54 25.855 -37 39 19.06   19.78 20.03     O9 2 0
17 [BGK2002] D13 * 00 54 26.105 -37 43 56.84   19.01 18.98     A0 4 0
18 [BGK2002] D2 * 00 54 26.406 -37 39 52.05   19.93 19.90     A1 3 0
19 MWMM V10 Ce* 00 54 26.85 -37 34 23.9     21.30     ~ 10 0
20 [BGK2002] C14 * 00 54 26.881 -37 37 34.41   20.08 20.26     B1 3 0
21 [BGK2002] C1 * 00 54 27.873 -37 32 30.71   19.21 19.14     A1 3 0
22 [PGF2002] cep050 Ce* 00 54 30.22 -37 43 04.4   23.56 22.44     ~ 3 0
23 [BGK2002] C5 V* 00 54 31.834 -37 34 32.86   20.55 20.66     B2 3 0
24 [BGK2002] D3 * 00 54 31.848 -37 40 00.89   21.53 21.50     ~ 2 0
25 [BGK2002] D12 V* 00 54 32.423 -37 43 37.46   18.82 18.65     A2 7 0
26 [BGK2002] D17 * 00 54 32.693 -37 45 21.46   19.56 19.54     B9.5 4 0
27 [BGK2002] D16 * 00 54 32.892 -37 45 02.51   20.98 20.92     A2.5 2 0
28 [BGK2002] C6 sg* 00 54 33.190 -37 34 55.72   19.96 19.91     A0Ia 5 0
29 [BGK2002] D1 * 00 54 34.625 -37 39 19.70   21.05 21.00     ~ 2 0
30 [PGF2002] cep035 Ce* 00 54 44.65 -37 38 30.6   21.85 21.23     ~ 3 0
31 [BGK2002] B3 * 00 54 46.351 -37 37 51.35   19.95 20.03     ~ 2 0
32 [BGK2002] B10 V* 00 54 47.072 -37 40 25.63   19.50 19.45     A2.5 4 0
33 [BGK2002] B11 V* 00 54 47.310 -37 40 42.28   19.95 19.95     A5 5 0
34 [PGF2002] cep015 Ce* 00 54 51.36 -37 39 11.0   22.71 21.56     ~ 5 0
35 [PGF2002] cep028 Ce* 00 54 51.39 -37 39 27.0   22.23 21.40     ~ 4 0
36 [BGK2002] B4 * 00 54 51.799 -37 38 13.93   20.04 20.09     B1 2 0
37 [BGK2002] B7 V* 00 54 51.950 -37 39 23.85   20.41 20.45     B2 3 0
38 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
39 MWMM V18 Ce* 00 54 53.98 -37 39 30.5     20.50     ~ 8 0
40 [BGK2002] B12 V* 00 54 56.083 -37 41 04.02   19.12 19.30     B0.5 5 0
41 [BGK2002] B13 V* 00 54 56.754 -37 41 33.79   18.53 18.64     B3 4 0
42 [BGK2002] B19 * 00 54 57.705 -37 43 38.65   19.88 19.93     B8.5 3 0
43 [BGK2002] B18 * 00 54 58.692 -37 43 21.06   20.18 20.35     B2.5 2 0
44 [PGF2002] cep032 Ce* 00 54 59.48 -37 38 34.2   22.64 21.56     ~ 4 0
45 [PGF2002] cep044 Ce* 00 54 59.73 -37 43 03.0   22.32 21.58     ~ 3 0
46 [BGK2002] B14 V* 00 55 01.465 -37 41 46.80   19.90 19.86     A0 3 0
47 [BGK2002] B15 * 00 55 03.464 -37 42 26.18   19.65 19.71     B1.7 3 0
48 [BGK2002] B17 V* 00 55 04.077 -37 42 53.99   19.27 19.37     B0.5 3 0
49 [PGF2002] cep045 Ce* 00 55 29.33 -37 41 23.0   22.90 22.11     ~ 3 0
50 [PGF2002] cep066 Ce* 00 55 29.53 -37 42 08.4   22.28 21.76     ~ 3 0
51 [BGK2002] A10 V* 00 55 31.961 -37 41 38.33   19.05 18.98     A2 8 0
52 MWMM V31 Ce* 00 55 36.56 -37 40 09.0     21.10     ~ 6 0
53 [BGK2002] A6 * 00 55 37.828 -37 40 07.01   19.77 19.74     A1.5 3 0
54 [BGK2002] A7 s*b 00 55 37.868 -37 40 23.44   20.32 20.43     B3/5Ia 2 0
55 [BGK2002] A11 V* 00 55 38.317 -37 41 56.81   18.48 18.41     B8 4 0
56 [BGK2002] A9 * 00 55 39.262 -37 41 18.23   20.06 20.23     B1 4 0
57 [BGK2002] A8 * 00 55 41.619 -37 40 58.61   19.43 19.44     B9.5 5 0
58 [BGK2002] A3 * 00 55 47.220 -37 38 50.51   20.17 20.10     ~ 2 0
59 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
60 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
61 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
62 NAME Local Group GrG ~ ~           ~ 9325 0

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