2020A&A...633A.155R


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.24CEST23:56:01

2020A&A...633A.155R - Astronomy and Astrophysics, volume 633A, 155-155 (2020/1-1)

The young stellar content of the giant H II regions M 8, G333.6-0.2, and NGC 6357 with VLT/KMOS.

RAMIREZ-TANNUS M.C., POORTA J., BIK A., KAPER L., DE KOTER A., DE RIDDER J., BEUTHER H., BRANDNER W., DAVIES B., GENNARO M., GUO D., HENNING T., LINZ H., NAYLOR T., PASQUALI A., RAMIREZ-AGUDELO O.H. and SANA H.

Abstract (from CDS):


Context. The identification and characterisation of populations of young massive stars in (giant) HII regions provides important constraints on (i) the formation process of massive stars and their early feedback on the environment, and (ii) the initial conditions for population synthesis models predicting the evolution of ensembles of stars.
Aims. We identify and characterise the stellar populations of the following young giant HII regions: M 8, G333.6-0.2, and NGC 6357.
Methods. We have acquired H- and K-band spectra of around 200 stars using the K-band Multi Object Spectrograph on the ESO Very Large Telescope. The targets for M 8 and NGC 6357 were selected from the Massive Young Star-Forming Complex Study in Infrared and X-ray (MYStIX), which combines X-ray observations with near-infrared (NIR) and mid-infrared data. For G333.6-0.2, the sample selection is based on the NIR colours combined with X-ray data. We introduce an automatic spectral classification method in order to obtain temperatures and luminosities for the observed stars. We analysed the stellar populations using their photometric, astrometric, and spectroscopic properties and compared the position of the stars in the Hertzprung-Russell diagram with stellar evolution models to constrain their ages and mass ranges.
Results. We confirm the presence of candidate ionising sources in the three regions and report new ones, including the first spectroscopically identified O stars in G333.6-0.2. In M 8 and NGC 6357, two populations are identified: (i) OB main-sequence stars (M>5M) and (ii) pre-main sequence stars (M~=0.5-5M). The ages of the clusters are ∼1-3Myr, <3Myr, and ∼0.5-3Myr for M 8, G333.6-0.2, and NGC 6357, respectively. We show that MYStIX selected targets have >90% probability of being members of the HII region, whereas a selection based on NIR colours leads to a membership probability of only ∼70%.

Abstract Copyright: © M. C. Ramírez-Tannus et al. 2020

Journal keyword(s): H II regions - stars: pre-main sequence - stars: formation - X-rays: stars - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/633/A155): g333.dat m8.dat ngc6357.dat sp/*>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

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 - 2021
#notes
1 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 978 3
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5986 1
3 RAFGL 890S MIR 06 10 50.60928 -06 11 51.2772           ~ 74 1
4 NAME Car Arm PoG 10 00 -60.0           ~ 389 1
5 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 442 1
6 GAL 332.80-00.60 HII 16 19 47 -51 04.1           ~ 92 1
7 NAME RCW 106 GMC MoC 16 21.0 -50 30           ~ 36 0
8 TYC 8320-899-1 * 16 22 04.6436119093 -50 05 55.652873895   11.66 11.10     ~ 2 0
9 GAL 333.6-00.2 HII 16 22 11 -50 05.6           ~ 143 0
10 2MASS J16222585-5005334 NIR 16 22 25.85304 -50 05 33.4752           ~ 1 0
11 2MASS J17243100-3411143 Y*O 17 24 31.0051991789 -34 11 14.310975248   14.22 13.38 12.937 12.241 ~ 5 0
12 Cl Pismis 24 OpC 17 24 43.0 -34 12 23   11.00 9.6     ~ 112 0
13 GAL 353.19+00.91 HII 17 24 48 -34 10.8           ~ 25 0
14 HD 157504 WR* 17 25 08.8534998754 -34 11 12.502902170 12.80 12.10 10.68 10.39 11.546 WC7+O7-9 111 0
15 2MASS J17252916-3425157 Y*O 17 25 29.1668373577 -34 25 15.653961432 13.8 13.36 11.91     O6Vn((f)) 13 0
16 2MASS J17253421-3423116 Y*O 17 25 34.240 -34 23 11.71 14.34 13.53 11.82     O5.5IV(f) 13 0
17 2MASS J17253860-3408435 Y*O 17 25 38.5953047496 -34 08 43.499265082 12.31 12.17 10.91 10.56   O6/7III 15 0
18 HD 319788 * 17 26 26.4587437219 -34 17 00.953805736 9.77 10.09 9.68     B8 16 0
19 NGC 6357 HII 17 26.5 -34 12           ~ 257 0
20 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12270 0
21 M 8 HII 18 03 37 -24 23.2           ~ 564 1
22 HD 164740 ISM 18 03 38.3 -24 22 35     9.10     ~ 19 1
23 CD-24 13806 ** 18 03 40.321 -24 22 42.86 10.26 10.88 10.30 10.27   O7:V 182 2
24 NAME Hourglass Nebula ISM 18 03 41.1 -24 22 37           ~ 74 2
25 2MASS J18034510-2422053 Y*O 18 03 45.0957087961 -24 22 05.323245530 9.67 10.13 9.95 10.17 9.54 OB- 27 0
26 2MASS J18035006-2421079 Y*O 18 03 50.0616663918 -24 21 07.944086966 17.295 15.735 14.618   13.294 ~ 7 0
27 * 9 Sgr Em* 18 03 52.4455370104 -24 21 38.639393923 5.08 5.97 5.97 5.72 5.70 O4V((f))z 522 0
28 HD 164816 Be* 18 03 56.8425960137 -24 18 45.119229391 6.17 7.06 6.986 8.08 6.989 O9.5V+B0V 143 0
29 2MASS J18041025-2420524 Y*O 18 04 10.2572769354 -24 20 52.386963243 14.334 13.510 12.842   12.011 F4I 14 0
30 2MASS J18041115-2421452 Y*O 18 04 11.1596841471 -24 21 45.176188791   10.497 10.374   10.140 B2V 22 0
31 HD 315026 ** 18 04 14.5189421200 -24 14 36.851688090 8.48 9.34 9.21 9.76   B0V 28 0
32 HD 315032 Y*O 18 04 15.0267934871 -24 23 27.715886777 9.170 9.164 9.122 9.71 9.039 B0IV 58 0
33 HD 315023 * 18 04 20.5583032258 -24 13 54.792067227 9.65 10.182 10.028 10.24 9.753 OB 28 0
34 CD-24 13829 ** 18 04 21.276144 -24 21 18.13716 8.47 9.476 9.453 9.651   B1.5Vne 41 0
35 CD-24 13830 Ae* 18 04 22.7422060077 -24 22 09.727392811 9.41 10.183 10.016 10.11 9.624 B2Ve 41 0
36 HD 315033 * 18 04 23.2281621482 -24 26 16.717071101 8.42 9.02 8.90     B1V 43 0
37 CPD-24 6164 * 18 04 23.9943131053 -24 21 26.708894372 9.13 9.89 9.74 9.98   B1Ve 34 0
38 NGC 6530 61 * 18 04 24.2935093003 -24 20 59.504736098 9.8 10.424 10.282   10.028 B1V 22 0
39 CD-24 13831 * 18 04 25.5552685429 -24 20 44.860453363 9.66 10.29 10.17     B1V 28 0
40 HD 164906 Be* 18 04 25.8333235219 -24 23 08.369754699 6.78 7.61 7.381 7.11 6.91 B0Ve 119 0
41 CPD-24 6170 * 18 04 27.2044125074 -24 22 49.635765444 10.07 10.67 10.54 10.61 10.179 B2V 20 0
42 HD 315031 SB* 18 04 28.0254548544 -24 21 42.787145059 7.68 9.17 9.09 9.16   B0.5IV/V+B1V 49 0
43 2MASS J18042898-2425262 Y*O 18 04 28.9891154022 -24 25 26.119867200 10.891 10.817 10.695   10.422 B2.5Ve 21 0
44 NGC 6530 OpC 18 04 31 -24 21.5           ~ 364 0
45 2MASS J18043292-2418445 Y*O 18 04 32.9187282120 -24 18 44.499091533 10 10.61 10.454 10.61 10.245 B2.5Vne 30 0
46 CD-24 13837 * 18 04 32.9905265949 -24 23 12.482207904 8.74 9.63 9.61 9.82   B1V 34 0
47 V* V5563 Sgr EB* 18 04 34.1893513554 -24 22 00.507176989 9.38 9.93 9.8     B2V 33 0
48 HD 315021 Y*O 18 04 35.9940715458 -24 19 52.032244943 8.892 8.553 8.509 9.41 8.397 B0V 56 0
49 CD-24 13844 * 18 04 39.9050683780 -24 22 44.654074916 10.4 11.00 10.92 10.90 10.559 B7 20 0
50 HD 164947B * 18 04 41.6431671980 -24 20 55.315758521   9.852 9.801 10.07 9.58 ~ 9 0
51 HD 164947A * 18 04 41.6749409300 -24 20 58.702956970       9.85   ~ 6 0
52 HD 315034 * 18 04 56.2552768252 -24 24 03.630008173   11.984 11.712   11.250 B5 15 0
53 HD 315035 Y*O 18 04 59.0214713266 -24 27 23.302731647   11.106 10.805   10.298 A2 22 0
54 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1517 0
55 W 49 SFR 19 10 20 +09 07.7           ~ 525 1
56 NAME Galactic Bulge reg ~ ~           ~ 3612 0

    Equat.    Gal    SGal    Ecl

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2021.06.24-23:56:01

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