2015ApJ...803...14P

Query : 2015ApJ...803...14P

2015ApJ...803...14P - Astrophys. J., 803, 14 (2015/April-2)

Red supergiant stars as cosmic abundance probes: KMOS observations in NGC 6822.

PATRICK L.R., EVANS C.J., DAVIES B., KUDRITZKI R.-P., GAZAK J.Z., BERGEMANN M., PLEZ B. and FERGUSON A.M.N.

Abstract (from CDS):

We present near-IR spectroscopy of red supergiant (RSG) stars in NGC 6822, obtained with the new K-band Multi-Object Spectrograph Very Large Telescope, Chile. From comparisons with model spectra in the J-band we determine the metallicity of 11 RSGs, finding a mean value of [Z] = -0.52±0.21, which agrees well with previous abundance studies of young stars and H ii regions. We also find an indication for a low-significance abundance gradient within the central 1 kpc. We compare our results with those derived from older stellar populations and investigate the difference using a simple chemical evolution model. By comparing the physical properties determined for RSGs in NGC 6822 with those derived using the same technique in the Galaxy and the Magellanic Clouds, we show that there appears to be no significant temperature variation of RSGs with respect to metallicity, in contrast to recent evolutionary models.

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Journal keyword(s): galaxies: individual: NGC 6822 - stars: abundances - supergiants

Nomenclature: Tables 2,4: [PED2015] NGC 6822-RSGNN (Nos 1-18).

Simbad objects: 30

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Number of rows : 30
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 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
5 Ass Per OB 1 As* 02 21 +57.6           ~ 181 1
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
9 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
10 [M98a] NGC 6822b-15 s*r 19 44 43.8020307360 -14 46 11.100391248   20.83 18.59 17.23   M/KI 5 0
11 2MASS J19444596-1451029 s*r 19 44 45.9748062120 -14 51 02.883440880   20.91 18.96 17.89   M/KI 6 0
12 CW Red 41 s*r 19 44 47.1167149728 -14 46 27.477331176   21.30 19.41 18.41   M/KI 4 0
13 [K67] V32 s*r 19 44 47.7985307784 -14 50 53.058219072   20.74 19.80 17.22   M1I 10 0
14 CW Red 47 s*r 19 44 50.5359059544 -14 48 01.915821108   20.83 18.95 17.97 17.05 M/KI 3 0
15 CW Red 55 s*r 19 44 51.6358235256 -14 48 58.221582912   21.33 19.45 18.32   M/KI 5 0
16 CW Red 32 s*r 19 44 53.4546171264 -14 45 52.919048700   20.36 18.43 17.38   M4.5I 5 0
17 CW Red 30 s*r 19 44 53.4582328440 -14 45 40.484634624   20.88 19.14 18.17   K5I 7 0
18 [K67] V23 s*r 19 44 54.4600983048 -14 48 06.584537880   20.56 19.30 17.35   M1I 12 0
19 [K67] C79 s*r 19 44 54.5381084952 -14 51 27.682568316 21.45 19.30 16.70 15.86   M0I 12 0
20 [K67] V18 s*r 19 44 55.7030105832 -14 51 55.982495700 21.10 19.11 16.91 15.74   M0I 11 0
21 CW Red 44 s*r 19 44 55.9214074320 -14 47 19.982762484   21.43 19.56 18.52   K5I 5 0
22 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
23 CW Red 54 s*r 19 44 56.8592892958 -14 48 58.891380112   21.05 19.06 18.04 17.03 M/KI 3 0
24 [K67] V19 s*r 19 44 57.3122956968 -14 49 20.594970300   19.69 17.41 16.20   M1I 14 0
25 2MASS J19445914-1447241 s*r 19 44 59.1348163272 -14 47 24.243164916   21.30 19.17 18.05   M/KI 3 0
26 [SRC2012] 296.250885-14.799762 s*r 19 45 00.2373636764 -14 47 59.227322636   21.27 19.20 18.10   M/KI 3 0
27 CW Red 50 s*r 19 45 00.5247829944 -14 48 26.890146900   20.84 18.75 17.52   M/KI 6 0
28 2MASS J19450697-1450315 s*r 19 45 06.9745904160 -14 50 31.673974488   21.06 19.12 18.06   M/KI 4 0
29 HD 187439 * 19 50 26.6386602672 -13 55 26.039188596   7.38 7.37     B5/7III 14 0
30 NAME Local Group GrG ~ ~           ~ 9325 0

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