2009A&A...504..429C


Query : 2009A&A...504..429C

2009A&A...504..429C - Astronomy and Astrophysics, volume 504, 429-435 (2009/9-3)

The p Cygni supergiant [OMN2000] LS1 - implications for the star formation history of W51.

CLARK J.S., DAVIES B., NAJARRO F., MacKENTY J., CROWTHER P.A., MESSINEO M. and THOMPSON M.A.

Abstract (from CDS):

We investigate the nature of the massive star [OMN2000] LS1 and use these results to constrain the history of star formation within the host complex W51. We utilised a combination of near-IR spectroscopy and non-LTE model atmosphere analysis to derive the physical properties of [OMN2000] LS1, and a combination of theoretical evolutionary calculations and Monte Carlo simulations to apply limits on the star formation history of W51. We find the spectrum of [OMN2000] LS1 to be consistent with that of a P Cygni supergiant. With a temperature in the range of 13.2-13.7kK and log(L*/L)≤5.75, it is significantly cooler, less luminous, and less massive than proposed by previous authors. The presence of such a star within W51 shows that star formation has been underway for at least 3Myr, while the formation of massive O stars is still on going. The lack of a population of evolved red supergiants within the complex shows that the rate of formation of young massive clusters at ages ≥9Myr was lower than currently observed. We find no evidence of internally triggered, sequential star formation within W51, and favour the suggestion that star formation has proceeded at multiple indepedent sites within the GMC. Along with other examples, such as the G305 and Carina star-forming regions, we suggest that W51 is a Galactic analogue of the ubiquitous star cluster complexes seen in external galaxies such as M51 and NGC 2403.

Abstract Copyright:

Journal keyword(s): stars: evolution - ISM: HII regions - Galaxy: Open clusters and associations: general - stars: early-type

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LH 39 As* 05 13 49.410 -69 32 42.76   10.89 10.86     ~ 24 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16539 1
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2210 1
4 LH 89 As* 05 36.2 -68 57           ~ 19 0
5 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1910 1
6 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1722 1
7 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 975 2
8 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 618 0
9 [DBS2003] 131 OpC 13 11 39.400 -62 33 11.55           ~ 15 0
10 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4169 4
11 Cl Westerlund 1 Cl* 16 47 04.00 -45 51 04.9           ~ 527 0
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13458 0
13 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 503 0
14 HD 316285 s*b 17 48 14.0372119152 -28 00 53.121269592 11.88 11.27 9.60 9.28   B0Ieq 187 2
15 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1202 2
16 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 270 2
17 RSGC 1 OpC 18 37 58 -06 53.0           ~ 101 0
18 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 92 0
19 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 53 0
20 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 500 0
21 GAL 048.9-00.3 HII 19 22 +14.0           ~ 16 0
22 StRS 296 * 19 22 52.8911176656 +14 11 21.058200600           ~ 3 0
23 [OMN2000] Region 1 NIR 19 23.0 +14 31           ~ 2 0
24 GAL 049.2-00.3 HII 19 23 03 +14 16.2           ~ 26 0
25 GAL 049.4-00.3 Cld 19 23 14 +14 26.9           ~ 20 0
26 W 51a HII 19 23 29.3 +14 31 38           ~ 166 0
27 W 51b SFR 19 23 32.8 +14 29 56           ~ 81 0
28 [WBN74] W 51 IRS 2 PCG 19 23 39.93 +14 31 09.4           ~ 277 0
29 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 155 0
30 2MASS J19234318+1430500 Y*O 19 23 43.18 +14 30 50.1           ~ 7 0
31 [KW97] 37-17 LP* 19 23 47.6411937672 +14 36 39.061233900     15.1     O4I 20 0
32 W 51 SNR 19 23 50 +14 06.0           ~ 1242 1
33 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1160 1
34 V* IK Peg dS* 21 26 26.6611049976 +19 22 32.310190344   6.294 6.064     kA6hA9mF0+DA 181 0

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2023.02.09-10:25:40

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