2010ApJ...720.1108B

Query : 2010ApJ...720.1108B

2010ApJ...720.1108B - Astrophys. J., 720, 1108-1117 (2010/September-2)

Progressive star formation in the young galactic super star cluster NGC 3603.

BECCARI G., SPEZZI L., DE MARCHI G., PARESCE F., YOUNG E., ANDERSEN M., PANAGIA N., BALICK B., BOND H., CALZETTI D., CAROLLO C.M., DISNEY M.J., DOPITA M.A., FROGEL J.A., HALL D.N.B., HOLTZMAN J.A., KIMBLE R.A., McCARTHY P.J., O'CONNELL R.W., SAHA A., SILK J.I., TRAUGER J.T., WALKER A.R., WHITMORE B.C. and WINDHORST R.A.

Abstract (from CDS):

Early Release Science observations of the cluster NGC 3603 with the WFC3 on the refurbished Hubble Space Telescope allow us to study its recent star formation history. Our analysis focuses on stars with Hα excess emission, a robust indicator of their pre-main sequence (PMS) accreting status. The comparison with theoretical PMS isochrones shows that 2/3 of the objects with Hα excess emission have ages from 1 to 10 Myr, with a median value of 3 Myr, while a surprising 1/3 of them are older than 10 Myr. The study of the spatial distribution of these PMS stars allows us to confirm their cluster membership and to statistically separate them from field stars. This result establishes unambiguously for the first time that star formation in and around the cluster has been ongoing for at least 10-20 Myr, at an apparently increasing rate.

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Journal keyword(s): open clusters and associations: individual: NGC 3603 - stars: pre-main sequence

Simbad objects: 12

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Number of rows : 12
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
5 NGC 2070 Cl* 05 38 42 -69 06.0     7.25     ~ 406 1
6 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
7 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
8 NAME Car Arm PoG 10 00 -60.0           ~ 471 1
9 NAME eta Car Cluster Cl* 10 45 03.0 -59 41 04           ~ 30 0
10 RCW 57 HII 11 14.7 -61 12           ~ 15 0
11 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
12 HD 97950 Cl* 11 15 07.346 -61 15 38.52 9.64 9.83 9.03 9.69   ~ 198 2

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