2008ApJ...684..118U

Query : 2008ApJ...684..118U

2008ApJ...684..118U - Astrophys. J., 684, 118-135 (2008/September-1)

The Araucaria project: the Local Group galaxy WLM–Distance and metallicity from quantitative spectroscopy of blue supergiants.

URBANEJA M.A., KUDRITZKI R.-P., BRESOLIN F., PRZYBILLA N., GIEREN W. and PIETRZYNSKI G.

Abstract (from CDS):

The quantitative analysis of low-resolution spectra of A and B supergiants is used to determine a distance modulus of 24.99±0.10 mag (995±46 kpc) to the Local Group galaxy WLM. The analysis yields stellar effective temperatures and gravities, which provide a distance through the flux-weighted gravity-luminosity relationship (FGLR). Our distance is 0.07 mag larger than the most recent results based on Cepheids and the tip of the red giant branch. This difference is within the 1 σ overlap of the typical uncertainties quoted in these photometric investigations. In addition, non-LTE spectral synthesis of the rich metal-line spectra (mostly iron, chromium, and titanium) of the A supergiants is carried out, which allows the determination of stellar metallicities. An average metallicity of -0.87±0.06 dex with respect to solar metallicity is found.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Distances and Redshifts - Galaxies: Individual: Alphanumeric: WLM - Stars: Early-Type - Stars: Supergiants

Simbad objects: 20

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Number of rows : 20
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 [SC85b] 22 s*b 00 01 53.2276995269 -15 28 40.091651644 17.30 17.97 17.97 17.94 17.93 B9Ia 5 0
2 [SC85b] 26 s*b 00 01 54.0722188054 -15 27 45.999005016 18.28 19.15 19.32 19.37 19.46 B0Iab 5 0
3 [SC85b] 51 sg* 00 01 56.1613482211 -15 26 24.976814522 20.02 20.01 19.79 19.61 19.41 A7Ib 5 0
4 LGGS J000156.62-152501.5 * 00 01 56.63 -15 25 01.2 22.13 22.18 21.05 20.47 19.93 G0I 3 0
5 [SC85b] 35 s*b 00 01 57.2076419877 -15 27 18.495823439 17.34 18.59 18.39 18.42 18.48 B1.5Ia 7 0
6 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
7 [SC85b] 10 sg* 00 01 57.9023655181 -15 30 13.707512092 17.85 18.58 18.38 18.32 18.27 A2Ia 5 0
8 LGGS J000158.12-152648.5 * 00 01 58.12 -15 26 48.6 18.60 19.57 19.66 19.71 19.82 B1.5 5 0
9 LGGS J000158.46-152433.8 * 00 01 58.46 -15 24 33.5   22.44 20.89 20.05 19.30 G5I 3 0
10 [SC85b] 68 * 00 01 59.0482667358 -15 24 43.153009037 19.90 20.13 20.14 20.09 20.06 A0II 4 0
11 [SC85b] 15 * 00 01 59.5754468276 -15 29 26.679003246 18.30 18.46 18.37 18.3 18.18 A2II 7 0
12 [SC85b] 30 s*b 00 01 59.9545854456 -15 28 19.576536780 17.23 18.27 18.38 18.45 18.57 O9.7Ia 13 0
13 [SC85b] 9 s*b 00 02 00.8313303957 -15 30 25.311865020 18.61 19.20 19.31 19.34 18.89 B5Ib 4 0
14 PSO J000.5066-15.4242 * 00 02 01.5874577814 -15 25 27.421650877 20.03 20.20 20.22 20.14 20.08 A2II 3 0
15 [SC85b] 45 s*b 00 02 03.3202597522 -15 25 53.007129936 18.71 19.29 19.41 19.43 19.51 B8Iab 5 0
16 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
17 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
18 HD 12953 sg* 02 08 40.5790963584 +58 25 24.970714608 6.28 6.29 5.68 5.09 4.59 A1Ia 198 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
20 NAME Local Group GrG ~ ~           ~ 9325 0

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