2012MNRAS.421.2998F

Query : 2012MNRAS.421.2998F

2012MNRAS.421.2998F - Mon. Not. R. Astron. Soc., 421, 2998-3003 (2012/April-3)

The Cepheid distance to the Local Group galaxy NGC 6822.

FEAST M.W., WHITELOCK P.A., MENZIES J.W. and MATSUNAGA N.

Abstract (from CDS):

Recent estimates of the Cepheid distance modulus of NGC 6822 differ by 0.18 mag. To investigate this we present new multi-epoch JHKS photometry of classical Cepheids in the central region of NGC 6822 and show that there is a zero-point difference from earlier work. These data together with optical and mid-infrared observations from the literature are used to derive estimates of the distance modulus of NGC 6822. A best value of 23.40 mag is adopted, based on a Large Magellanic Cloud (LMC) distance modulus of 18.50 mag. The standard error of this quantity is ∼ 0.05 mag. We show that to derive consistent moduli from Cepheid observations at different wavelengths, it is necessary that the fiducial LMC period–luminosity relations at these wavelengths should refer to the same subsample of stars. Such a set is provided. A distance modulus based on RR Lyrae variables agrees with the Cepheid result.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: variables: Cepheids - galaxies: distances and redshifts - galaxies: individual: NGC 6822 - Local Group

VizieR on-line data: <Available at CDS (J/MNRAS/421/2998): table3.dat table2.dat>

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12651 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11150 1
3 SV* HV 12724 cC* 04 46 01.0792664928 -69 38 55.760603856   15.72 14.761 14.21 13.750 ~ 21 0
4 SV* HV 12471 cC* 04 50 52.4378107416 -69 18 55.866352860   15.58 14.756 13.95 13.656 ~ 32 0
5 SV* HV 876 cC* 04 57 12.3631684656 -67 22 57.291144672   14.29 13.666 13.32 12.711 ~ 28 0
6 [BE74] 176 cC* 04 57 50.8911513240 -67 50 18.879778212   13.995 14.255 13.79 13.490 ~ 23 0
7 SV* HV 878 cC* 04 57 51.0483921048 -69 57 29.683493100   13.40 13.623 13.62 12.693 ~ 47 0
8 SV* HV 12505 cC* 04 57 56.7393106608 -68 48 57.612161700   16.99 14.847 14.75 13.808 ~ 22 0
9 SV* HV 2270 cC* 05 00 48.3654876648 -69 31 54.641073180   15.50 14.740 14.11 13.675 ~ 29 0
10 SV* HV 2260 cC* 05 00 55.8717251064 -68 26 20.815577988   15.67 14.906 14.35 13.933 ~ 44 0
11 SV* HV 2282 cC* 05 01 24.9394462656 -70 04 18.287395644   15.10 14.446 13.95 13.350 ~ 31 0
12 SV* HV 887 cC* 05 02 10.2713664432 -69 32 23.708577804   14.84 14.208 13.62 13.231 ~ 29 0
13 SV* HV 2291 cC* 05 03 46.1840714736 -68 52 36.292197792   14.99 14.162 13.78 13.013 ~ 29 0
14 SV* HV 889 cC* 05 03 49.5107414688 -68 56 02.585788188   14.18 13.770 13.56 12.714 ~ 40 0
15 SV* HV 891 cC* 05 04 15.4957502664 -69 01 36.095442564   14.47 13.967 13.34 13.010 ~ 24 0
16 SV* HV 892 cC* 05 04 21.0829292064 -68 43 42.784679496   15.10 14.262 13.98 13.341 ~ 27 0
17 SV* HV 893 cC* 05 06 00.9029155680 -69 06 17.126605980   15.07 13.884 13.49 12.977 ~ 29 0
18 SV* HV 899 cC* 05 07 07.8256721256 -68 53 19.448617524   13.50 13.471 12.83 12.403 ~ 56 0
19 SV* HV 2324 cC* 05 07 21.6931078392 -68 20 18.345986988   15.23 14.464 13.90 13.447 ~ 34 0
20 SV* HV 901 cC* 05 07 42.1400471544 -69 14 48.106043736   15.47 14.455 13.84 13.348 ~ 27 0
21 SV* HV 904 cC* 05 08 18.2386417176 -68 46 47.058274920   14.42 13.564 13.45 12.452 ~ 36 0
22 SV* HV 2339 cC* 05 08 49.5351793512 -68 59 59.038673568   15.06 14.299 13.89 13.406 ~ 28 0
23 SV* HV 5655 cC* 05 11 05.4172344768 -70 30 34.412745888   15.46 14.563 14.06 13.578 ~ 32 0
24 SV* HV 2432 cC* 05 18 13.7834721960 -68 19 30.448622316   15.02 14.227 13.96 13.507 ~ 27 0
25 SV* HV 932 cC* 05 19 14.7998129232 -69 36 18.144066456   15.03 14.329 13.85 13.379 ~ 29 0
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17437 0
27 SV* HV 2527 cC* 05 25 39.1090655328 -71 06 39.848203476   15.49 14.615 14.16 13.670 ~ 38 0
28 SV* HV 2549 cC* 05 27 00.5741329320 -71 38 35.749371876   14.34 13.796 13.36 12.890 ~ 43 0
29 SV* HV 2538 cC* 05 27 07.7611991376 -68 29 42.907715952   15.32 14.475 14.05 13.468 ~ 23 0
30 SV* HV 997 cC* 05 33 00.9894859776 -68 11 27.619585692   15.46 14.591 14.20 13.635 ~ 39 0
31 SV* HV 1005 cC* 05 36 06.7990326216 -68 49 13.370391588   14.92 14.70 14.12 13.222 ~ 37 0
32 SV* HV 1006 cC* 05 37 22.4442138216 -69 28 59.373425928   15.23 14.398 13.91 13.478 ~ 26 0
33 SV* HV 2793 cC* 05 41 48.5455187616 -68 41 16.103127012   14.66 14.089   13.047 M 38 0
34 SV* HV 1019 cC* 05 42 51.0622135080 -70 08 12.240669264     14.361   13.503 ~ 20 0
35 SV* HV 12656 cC* 05 48 06.9220844304 -71 30 21.405996504   14.69 14.153 13.68 13.333 ~ 21 0
36 [PGU2004] cep022 Ce* 19 44 50.16 -14 52 29.0           ~ 5 0
37 [K67] V25 Ce* 19 44 50.85 -14 48 36.5   20.56 20.50     ~ 9 0
38 [PGU2004] cep016 Ce* 19 44 51.32 -14 54 19.1           ~ 5 0
39 [PGU2004] cep011 Ce* 19 44 52.31 -14 47 35.9           ~ 6 0
40 [H25] V9 Ce* 19 44 53.00 -14 48 38.9   20.82 19.70     ~ 11 0
41 [H25] V2 Ce* 19 44 55.1304577246 -14 47 12.054332104   20.09 18.90     ~ 14 0
42 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
43 [H25] V4 Ce* 19 44 56.56 -14 50 34.3   20.35 19.40     ~ 10 0
44 [K67] V28 Ce* 19 44 56.76 -14 51 18.5   20.03 19.10     ~ 8 0
45 [H25] V7 Ce* 19 44 56.82 -14 53 15.7   18.70 18.20     ~ 9 0
46 [H25] V1 Ce* 19 44 59.62 -14 47 10.3   19.08 19.00     ~ 13 0
47 [PGU2004] cep025 Ce* 19 45 00.36 -14 47 04.4   22.238 21.106     ~ 7 0
48 [H25] V13 Ce* 19 45 01.90 -14 47 32.3   19.53 18.40     ~ 16 0
49 [H25] V6 Ce* 19 45 02.22 -14 53 44.2   20.54 19.60     ~ 9 0
50 [H25] V5 Ce* 19 45 02.54 -14 51 06.8   20.87 20.20     ~ 10 0
51 [PGU2004] cep026 Ce* 19 45 04.46 -14 52 53.5           ~ 5 0
52 [PGU2004] cep028 Ce* 19 45 05.65 -14 53 21.0           ~ 5 0
53 [K67] V21 Ce* 19 45 06.44 -14 51 04.8   20.57 19.80     ~ 9 0
54 [PGU2004] cep101 Ce* 19 45 06.90 -14 53 21.4           ~ 3 0
55 [PGU2004] cep012 Ce* 19 45 08.26 -14 53 49.9           ~ 5 0
56 NAME Local Group GrG ~ ~           ~ 8392 0

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