2022ApJ...940...32B

Query : 2022ApJ...940...32B

2022ApJ...940...32B - Astrophys. J., 940, 32 (2022/November-3)

The Metallicity and Distance of NGC 2403 from Blue Supergiants.

BRESOLIN F., KUDRITZKI R.-P. and URBANEJA M.A.

Abstract (from CDS):

We present the first quantitative spectral analysis of blue supergiant stars in the nearby galaxy NGC 2403. Out of a sample of 47 targets observed with the LRIS spectrograph at the Keck I telescope we have extracted 16 B- and A-type supergiants for which we have data of sufficient quality to carry out a comparison with model spectra of evolved massive stars and infer the stellar parameters. The radial metallicity gradient of NGC 2403 that we derive has a slope of -0.14(±0.05) dex ${r}_{e}^{-1}$, and is in accordance with the analysis of H II region oxygen abundances. We present evidence that the stellar metallicities that we obtain in extragalactic systems in general agree with the nebular abundances based on the analysis of the auroral lines, over more than 1 order of magnitude in metallicity. Adopting the known relation between stellar parameters and intrinsic luminosity we find a distance modulus μ = 27.38 ± 0.08 mag. While this can be brought into agreement with Cepheid-based determinations, it is 0.14 mag short of the value measured from the tip of the red giant branch. We update the mass-metallicity relation secured from chemical abundance studies of stars in resolved star-forming galaxies.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy abundances - Galaxy stellar content - Stellar abundances

Nomenclature: Fig. 1, Table 1: [BKU2022] NN (Nos 1-47).

Simbad objects: 58

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Number of rows : 58
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 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
6 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
7 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
10 [BKU2022] 1 s*b 07 36 03.25 +65 36 26.5           B1Ia 1 0
11 [BKU2022] 2 s*b 07 36 07.44 +65 37 51.8           B9-A0Ia 1 0
12 [BKU2022] 3 s*b 07 36 11.48 +65 38 00.3           B7-8Ia 1 0
13 [BKU2022] 4 s*b 07 36 15.73 +65 37 25.8           B4-5Ia 1 0
14 [BKU2022] 5 s*b 07 36 18.76 +65 39 27.4           B3Ia 1 0
15 [BKU2022] 8 s*b 07 36 25.11 +65 37 04.6   21.04 20.95     B0Ib 1 0
16 [BKU2022] 9 s*b 07 36 26.14 +65 36 03.7   19.86 19.93     B1Ia 1 0
17 [BKU2022] 10 s*b 07 36 29.30 +65 36 45.0   20.60 20.5     B9Ia 1 0
18 [BKU2022] 11 s*b 07 36 30.56 +65 37 19.6           B2Ia 1 0
19 [BKU2022] 14 s*b 07 36 44.16 +65 36 49.0   20.17 20.16     B2-3Ia 1 0
20 [BKU2022] 15 s*b 07 36 46.47 +65 35 58.4   21.36 21.43     B1Ib 1 0
21 [BKU2022] 16 s*b 07 36 47.88 +65 35 45.6   20.15 19.91     B4Ia 1 0
22 [BKU2022] 18 sg* 07 36 48.02 +65 35 36.2           A7-F0Ia 1 0
23 [BKU2022] 19 s*b 07 36 48.26 +65 35 35.0   20.27 20.13     B7Ia+WC 1 0
24 [BKU2022] 20 s*b 07 36 48.560 +65 36 45.50   20.07 19.89     B8-9Ia 2 0
25 [BKU2022] 21 s*b 07 36 49.08 +65 36 03.4   21.27 21.11     B3Ib 1 0
26 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
27 [BKU2022] 22 s*b 07 36 51.38 +65 34 56.2   20.50 20.19     B4Ia 1 0
28 [BKU2022] 23 s*b 07 36 54.99 +65 36 54.2   20.19 20.2     B2Ia 1 0
29 [BKU2022] 24 s*b 07 36 55.80 +65 34 10.5   20.63 20.44     BIa+WNL 1 0
30 [BKU2022] 25 sg* 07 36 56.70 +65 35 21.1   20.13 19.9     A3Ia 1 0
31 [BKU2022] 26 s*b 07 36 58.00 +65 35 46.0   20.70 20.81     O8-9Ia 1 0
32 [BKU2022] 27 s*b 07 37 00.12 +65 35 22.6   20.80 20.85     B0Ia 1 0
33 [BKU2022] 28 sg* 07 37 00.40 +65 34 41.4   20.55 20.39     A2Ia 1 0
34 [BKU2022] 29 s*b 07 37 01.340 +65 34 26.06   20.03 19.9     B8Ia 2 0
35 [BKU2022] 30 s*b 07 37 01.77 +65 35 21.1   21.02 20.89     B9-A0Ib 1 0
36 [BKU2022] 31 s*b 07 37 02.08 +65 34 24.6   20.76 20.78     B1-2Ia 1 0
37 [BKU2022] 32 sg* 07 37 06.32 +65 35 32.2   21.14 20.86     A1-2Ia 1 0
38 [BKU2022] 33 s*b 07 37 06.70 +65 35 20.3   20.83 20.85     B0-1Ia 1 0
39 [S75b] NGC 2403 2 HII 07 37 06.82 +65 36 38.7           ~ 41 0
40 [BKU2022] 34 s*b 07 37 07.57 +65 32 44.5           B1-2Ib 1 0
41 [BKU2022] 37 s*b 07 37 16.91 +65 33 18.8           B3Ia+WN 1 0
42 [BKU2022] 38 sg* 07 37 17.40 +65 34 13.9           A1-2Ia 1 0
43 [BKU2022] 39 s*b 07 37 17.57 +65 33 59.8           B7-8Ia 1 0
44 [BKU2022] 40 s*b 07 37 17.98 +65 35 33.5   20.53 20.48     B1Ib 1 0
45 [BKU2022] 41 s*b 07 37 18.34 +65 34 56.4           B7Ia 1 0
46 [BKU2022] 42 s*b 07 37 18.55 +65 31 49.7           B0Ia 1 0
47 [BKU2022] 43 s*b 07 37 20.74 +65 32 50.6           B1Ia 1 0
48 [BKU2022] 44 * 07 37 21.41 +65 31 27.7           A0III 1 0
49 [BKU2022] 46 s*b 07 37 27.46 +65 31 05.2           B3Ib 1 0
50 [BKU2022] 47 s*b 07 37 30.19 +65 31 01.5           B8-9Ib 1 0
51 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
52 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
53 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
54 NGC 3621 Sy2 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 661 3
55 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
56 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
57 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
58 NAME Local Group GrG ~ ~           ~ 9325 0

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