2011A&A...534A.114M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET21:45:24

2011A&A...534A.114M - Astronomy and Astrophysics, volume 534A, 114-114 (2011/10-1)

An obscured cluster associated with the HII region RCW 173.

MARCO A. and NEGUERUELA I.

Abstract (from CDS):

The discovery of several clusters of red supergiants towards l=24°-30° has triggered interest in this area of the Galactic plane, where lines of sight are very complex and previous explorations of the stellar content were very preliminary. We attempt to characterise the stellar population associated with the HII region RCW 173 (=Sh2-60), located at l=25.3°, as previous studies have suggested that this population could be beyond the Sagittarius arm. We obtained UBV photometry of a stellar field to the south of the brightest part of RCW 173, as well as spectroscopy of about twenty stars in the area. We combined our new data with archival 2MASS near-infrared photometry and Spitzer/GLIMPSE imaging and photometry, to achieve a more accurate characterisation of the stellar sources and the associated cloud. We find a significant population of early-type stars located at d=3.0kpc, in good agreement with the ``near'' dynamical distance to the HII region. This population should be located at the near intersection of the Scutum-Crux arm. A luminous O7II star is likely to be the main source of ionisation. Many stars are concentrated around the bright nebulosity, where GLIMPSE images in the mid infrared show the presence of a bubble of excited material surrounding a cavity that coincides spatially with a number of B0-1V stars. We interpret this as an emerging cluster, perhaps triggered by the nearby O7II star. We also find a number of B-type giants. Some of them are located at approximately the same distance, and may be part of an older population in the same area, characterised by much lower reddening. A few have shorter distance moduli and are likely to be located in the Sagittarius arm. The line of sight in this direction is very complex. Optically visible tracers delineate two spiral arms, but seem to be absent beyond d∼3kpc. Several HII regions in this area suggest that the Scutum-Crux arm contains thick clouds actively forming stars. All these populations are projected on top of the major stellar complex signposted by the clusters of red supergiants.

Abstract Copyright:

Journal keyword(s): techniques: photometric - methods: observational - Hertzsprung-Russell and C-M diagrams - Galaxy: stellar content - open cluster and associations: individual: Alicante 6 - techniques: imaging spectroscopy

VizieR on-line data: <Available at CDS (J/A+A/534/A114): table2.dat table3.dat table4.dat>

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

Simbad objects: 23

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Number of rows : 23

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 NGC 2452 PN 07 47 26.2648363344 -27 20 06.826143423   17.9 12.20     [WO1] 248 0
2 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 283 0
3 EM* AS 310 Ae* 18 33 21.1940643266 -04 58 05.977829160   13.58 12.52 12.62   B1e 123 1
4 Cl Alicante 6 Cl* 18 36.0 -06 37           ~ 2 0
5 GSC 05124-02549 * 18 36 20.7790145744 -06 42 16.291142214   12.79 12.06     B3 4 0
6 [CPA2006] N37 bub 18 36 23 -06 39.6           ~ 17 0
7 IRAS 18337-0645 * 18 36 29.2840540970 -06 42 46.839534313   11.99 11.32     B3 6 0
8 GSC 05124-02559 * 18 36 31.1187596387 -06 42 57.292659113 13.06 13.15 12.39 12.53   B3 4 0
9 2MASS J18363487-0637227 * 18 36 34.8720265412 -06 37 22.753326493           B0.5V 1 0
10 NGC 6664 OpC 18 36 37 -07 48.8   8.81 7.8     ~ 106 0
11 LBN 025.36+00.24 HII 18 36 42.3 -06 37 28           ~ 15 0
12 GSC 05124-02627 * 18 36 45.4397390213 -06 46 47.311053889   12.77 11.82 11.76   B3 2 0
13 GSC 05124-02567 * 18 36 52.1332399227 -06 43 36.682375320   12.8 12.04     B9 2 0
14 GSC 05124-02605 * 18 36 53.85 -06 42 36.2   13.51 12.66     B5 2 0
15 LBN 024.48-00.22 HII 18 37.0 -07 35           ~ 8 0
16 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 102 0
17 Cl Trumpler 35 OpC 18 42 54 -04 08.0   10.44 9.2     ~ 66 0
18 SA 110- reg 18 45 +00.6           ~ 95 0
19 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 457 0
20 C 1845-059 OpC 18 48 09 -05 51.9   9.34 8.9     ~ 29 0
21 NGC 6704 OpC 18 50 45 -05 12.6   10.00 9.2     ~ 32 0
22 NAME Sgr Arm PoG 19 00 -30.0           ~ 542 1
23 NAME Galactic Bar reg ~ ~           ~ 957 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-21:45:24

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