2000AJ....119.1860B

Query : 2000AJ....119.1860B

2000AJ....119.1860B - Astron. J., 119, 1860-1871 (2000/April-0)

The stellar content of obscured galactic giant H II regions. II. W42.

BLUM R.D., CONTI P.S. and DAMINELI A.

Abstract (from CDS):

We present near-infrared J, H, and K images and K-band spectroscopy in the giant H II region W42. A massive star cluster is revealed; the color-color plot and K-band spectroscopic emission features of two of the brighter objects suggest the presence of young stellar objects. The spectrum of the bright central star is similar to unobscured stars with MK spectral types of O5-O6.5. If this star is on the zero-age main sequence, then the derived spectrophotometric distance is considerably smaller than previous estimates. The Lyman continuum luminosity of the cluster is a few times that of the Trapezium. The slope of the K-band luminosity function is similar to that for the Trapezium cluster and significantly steeper than that for the massive star cluster in M17 or in the Arches cluster near the Galactic center.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - Infrared: Stars - Stars: Early-Type - Stars: Formation - Stars: Fundamental Parameters

Nomenclature: Fig.1a: [BCD2000] W42 N (Nos 1-3).

CDS comments: Par. 2.1 : standard 9170 is GSPC S875-C, 9172 is GSPC S279-F.

Simbad objects: 19

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Number of rows : 19
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 LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
2 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
3 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
4 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
5 GSPC S875-C * 17 27 22.2594975984 -00 19 23.478827700           ~ 12 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
7 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
8 GSPC S279-F * 17 48 22.7 -45 25 45           ~ 29 0
9 HD 166960 * 18 13 09.9996912096 -04 00 41.795196588   6.839 6.574     A2mA5/7-F2 51 0
10 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
11 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
12 [LDW85] 25.4NW FIR 18 38 06.6 -06 45 45           ~ 9 0
13 [LDW85] 25.4SE FIR 18 38 14.4 -06 47 54           ~ 5 0
14 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 120 0
15 NAME W 42 Cluster cor 18 38 15.204 -06 47 52.87           ~ 23 0
16 USNO-B1.0 0832-00443053 * 18 38 15.3 -06 47 58       16.06   O5.5 6 0
17 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
18 [BCD2000] W42 3 * ~ ~           ~ 2 0
19 [BCD2000] W42 2 * ~ ~           ~ 1 0

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