2016A&A...589A..16W


Query : 2016A&A...589A..16W

2016A&A...589A..16W - Astronomy and Astrophysics, volume 589A, 16-16 (2016/5-1)

The massive stellar population of W49: A spectroscopic survey.

WU S.-W., BIK A., BESTENLEHNER J.M., HENNING T., PASQUALI A., BRANDNER W. and STOLTE A.

Abstract (from CDS):

Context. Massive stars form on different scales that range from large, dispersed OB associations to compact, dense starburst clusters. The complex structure of regions of massive star formation and the involved short timescales provide a challenge for our understanding of their birth and early evolution. As one of the most massive and luminous star-forming region in our Galaxy, W49 is the ideal place to study the formation of the most massive stars.
Aims. By classifying the massive young stars that are deeply embedded in the molecular cloud of W49, we aim to investigate and trace the star formation history of this region.
Methods. We analyse near-infrared K-band spectroscopic observations of W49 from LBT/LUCI combined with JHK images obtained with NTT/SOFI and LBT/LUCI. Based on JHK-band photometry and K-band spectroscopy, the massive stars are placed in a Hertzsprung Russell diagram. By comparison with evolutionary models, their age and hence the star formation history of W49 can be investigated.
Results. Fourteen O-type stars, as well as two young stellar objects (YSOs), are identified by our spectroscopic survey. Eleven O stars are main sequence stars with subtypes ranging from O3 to O9.5 and masses ranging from ∼20M to ∼120M. Three of the O stars show strong wind features and are considered to be Of-type supergiants with masses beyond 100M. The two YSOs show CO emission, which is indicative of the presence of circumstellar disks in the central region of the massive cluster. The age of the cluster is estimated as ∼1.5Myr, with star formation continuing in different parts of the region. The ionising photons from the central massive stars have not yet cleared the molecular cocoon surrounding the cluster. W49 is comparable to extragalactic star-forming regions, and it provides us with a unique chance to study a starburst in detail.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: formation - stars: massive - supergiants - infrared: stars - techniques: spectroscopic - open clusters and associations: individual: W49

VizieR on-line data: <Available at CDS (J/A+A/589/A16): tablea1.dat sp/*>

Nomenclature: Table A.1: [WBB2016] NN (Nos 1-22). Table A.2: [WBB2016] NN (Nos 23-44).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10315 1
2 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 462 0
3 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1002 3
4 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 316 0
5 Cl Trumpler 14 OpC 10 43 57 -59 33.2   5.70 5.5     ~ 471 0
6 Cl Trumpler 16 OpC 10 45 01 -59 42.0   5.35 5.0     ~ 455 0
7 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 951 2
8 HD 97950 Cl* 11 15 07.346 -61 15 38.52 9.64 9.83 9.03 9.69   ~ 187 2
9 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1017 1
10 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 511 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13091 0
12 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 489 0
13 2MASS J19101158+0907062 Y*O 19 10 11.58 +09 07 06.3           O3-O7V 8 0
14 [WBB2016] 3 * 19 10 11.906 +09 06 57.85           O3-O7V 1 0
15 [WBB2016] 13 * 19 10 12.678 +09 05 25.24           B0-B2V 1 0
16 [WBB2016] 21 Y*O 19 10 12.8 +09 07 02           ~ 1 0
17 [WBB2016] 6 * 19 10 14.927 +09 06 49.43           B2-B3V 1 0
18 SSTOERC G043.1716+00.0017 Y*O 19 10 16.025 +09 06 13.59           ~ 2 0
19 [WBB2016] 7 * 19 10 16.463 +09 06 02.73           O3-O5V 1 0
20 [WBB2016] 9 * 19 10 16.588 +09 06 18.49           O3-O7V 1 0
21 2MASS J19101690+0906104 * 19 10 16.91 +09 06 10.4           O5-O7V 2 0
22 [WBB2016] 10 * 19 10 17.3 +09 06 19           O5-O7V 1 0
23 [WBB2016] 17 * 19 10 17.319 +09 06 13.76           O7-O9.5 1 0
24 [WBB2016] 1 * 19 10 17.418 +09 06 20.65           O2-3.5If* 2 0
25 2MASS J19101742+0907010 Y*? 19 10 17.427 +09 07 01.04           O3-O5V 2 0
26 [WBB2016] 18 * 19 10 17.5 +09 06 23           O8-O9.5 1 0
27 [WBB2016] 5 * 19 10 17.679 +09 06 21.47           O3-O5V 1 0
28 [WBB2016] 11 * 19 10 18.7 +09 05 56           O3-O5V 1 0
29 2MASS J19101901+0906230 Y*? 19 10 19.020 +09 06 23.02           O2-3.5If* 2 0
30 W 49 SFR 19 10 20 +09 07.7           ~ 541 1
31 [WBB2016] 2 * 19 10 21.858 +09 05 02.53           O2-3.5If* 1 0
32 W 51 SNR 19 23 50 +14 06.0           ~ 1219 1
33 NGC 3603 6 * ~ ~   15.51 14.16     ~ 3 0

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2022.08.10-19:39:22

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