2001ApJ...548L.159B

Query : 2001ApJ...548L.159B

2001ApJ...548L.159B - Astrophys. J., 548, L159-L163 (2001/February-3)

Stellar spectroscopy far beyond the Local Group.

BRESOLIN F., KUDRITZKI R.-P., MENDEZ R.H. and PRZYBILLA N.

Abstract (from CDS):

Multiobject spectroscopic observations of blue supergiants in NGC 3621, a spiral galaxy at a distance of 6.7 Mpc, carried out with the ESO Very Large Telescope and focal reducer/spectrograph are presented. We demonstrate the feasibility of quantitative stellar spectroscopy at distances approaching a tenfold increase over previous investigations by determining the chemical composition, stellar parameters, reddening, extinction, and wind properties of one of our targets, a supergiant of spectral type A1 Ia located on the outskirts of NGC 3621. The metallicity (determined from iron group elements) is reduced by a factor of 2 relative to the Sun, in qualitative agreement with the results from previous abundance studies based on H II region oxygen emission lines. Reddening and extinction are E(B-V)=0.12 and AV=0.37, respectively, mostly caused by the Galactic foreground. Comparing stellar wind momentum and absolute V magnitude with Galactic and M31 counterparts, we confirm the potential of the wind momentum-luminosity relationship as an alternative tool for estimating extragalactic distances.

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Journal keyword(s): Galaxies: Individual: NGC Number: NGC 3621 - Galaxies: Stellar Content - Stars: Early-Type - Stars: Winds, Outflows

Nomenclature: Fig.1, Table 1: [BKM2001] NN (Nos 1-19), [BKM2001] Star a (Nos a-c).

Simbad objects: 27

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Number of rows : 27
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 [BKM2001] 6 ? 11 18 07.9 -32 47 46   21.91 21.80     ~ 1 0
7 [BKM2001] 3 ? 11 18 10.3 -32 46 25   21.67 21.67     ~ 1 0
8 [BKM2001] 10 ? 11 18 10.7 -32 49 12   22.35 22.32     ~ 1 0
9 [BKM2001] 1 * 11 18 14.3 -32 45 40   21.57 21.43     ~ 2 0
10 [BKM2001] 5 ? 11 18 15.3 -32 46 54   20.83 20.76     ~ 1 0
11 [BKM2001] 7 ? 11 18 15.8 -32 47 39   21.34 21.06     ~ 1 0
12 [BKM2001] 8 ? 11 18 15.9 -32 48 11   20.49 20.19     ~ 1 0
13 NGC 3621 Sy2 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 661 3
14 [BKM2001] 13 * 11 18 16.7 -32 50 13   21.52 21.07     ~ 1 0
15 [BKM2001] Star c * 11 18 18.1 -32 49 32   20.64 20.39     ~ 1 0
16 [BKM2001] 18 ? 11 18 18.2 -32 51 59   21.04 21.04     ~ 1 0
17 [BKM2001] 19 ? 11 18 19.6 -32 52 10   20.30 19.51     ~ 1 0
18 [BKM2001] 15 ? 11 18 20.2 -32 50 35   21.83 21.68     ~ 1 0
19 [BKM2001] 2 V* 11 18 20.6 -32 45 31   29.53 20.41     ~ 2 0
20 [BKM2001] 16 * 11 18 23.3 -32 51 03   21.81 21.74     ~ 2 0
21 [BKM2001] 14 ? 11 18 26.6 -32 50 06   22.10 21.90     ~ 1 0
22 [BKM2001] Star b s*y 11 18 27.2 -32 46 03   20.75 20.43     F0/2Ia 1 0
23 [BKM2001] 17 * 11 18 27.5 -32 51 05   21.22 21.01     ~ 2 0
24 [BKM2001] Star a sg* 11 18 28.7 -32 48 05   20.64 20.47     A1Ia 2 0
25 [BKM2001] 11 HII 11 18 30.5 -32 48 38   21.85 21.87     ~ 1 0
26 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
27 NAME Local Group GrG ~ ~           ~ 9325 0

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