2008MNRAS.390.1185A

Query : 2008MNRAS.390.1185A

2008MNRAS.390.1185A - Mon. Not. R. Astron. Soc., 390, 1185-1194 (2008/November-1)

Near-infrared photometry and radio continuum study of the massive star-forming regions IRAS 21413+5442 and IRAS 21407+5441.

ANANDARAO B.G., VENKATA RAMAN V., GHOSH S.K., OJHA D.K. and KUMAR M.S.N.

Abstract (from CDS):

IRAS 21413+5442 and IRAS 21407+5441 are two massive star-forming regions of high luminosity, likely associated with each other. Near-infrared (NIR) photometry on these two IRAS sources was performed at United Kingdom Infrared Telescope (UKIRT) using the UFTI under excellent seeing conditions yielding an angular resolution of ∼0.5 arcsec. Our results reveal details of stellar content to a completeness limit (90 per cent) of J = 18.5,H = 18.0 and K = 17.5 mag in the two regions. In IRAS 21413+5442, we identify a late O-type star, having large H - K colour, to be near the centre of the CO jets observed by earlier authors. The UKIRT images reveal in IRAS 21407+5441, a faint but clear compact HII region around a central high- and intermediate-mass star cluster. We have detected a number of sources with large H - K colour which are not detected in J band. We also present the GMRT radio continuum map at 1.28 GHz covering the entire region surrounding the two star-forming clouds. The radio continuum fluxes are used to estimate the properties of HII regions which seem to support our NIR photometric results. Based on our radio continuum map and the archival Midcourse Space Experiment (MSX) 8.2-µm image, we show that the two IRAS sources likely belong to the same parent molecular cloud and conjecture that a high-mass star of large IR colours, present in between the two sources, might have triggered star formation in this region. However, one cannot rule out the alternative possibility that Star A could be a nearby foreground star.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): stars: formation - dust, extinction - HII regions - infrared: stars - radio continuum: general

VizieR on-line data: <Available at CDS (J/MNRAS/390/1185): table1.dat table2.dat table3.dat>

Nomenclature: Fig. 1: [AVG2008] Cluster NW (Nos 1, 2C, 2N), [AVG2008] Star A (No. A). Tables 1, 2, 3: [AVG2008] JHHMMSS.ss+DDMMSS.ss N=86+62+30. Fig. 2, Table 1, col(6): [AVG2008] Cluster 1 NN (Nos 1-12). Fig.3, Table 1, col(6): [AVG2008] Cluster 2C NN (Nos 1-13). Fig.2, Table 1, col(6): [AVG2008] Cluster 2N NN (Nos 1-12).

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

CDS comments: Star A = 2MASS J21424319+5455519

Simbad objects: 8

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Number of rows : 8
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 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
3 FS 151 * 21 04 14.8425155448 +30 30 21.929692824   14.22 13.53     G2 5 0
4 NAME IRAS 21413+5442S HII 21 41 21.22 +54 42 32.0           ~ 3 0
5 NAME IRAS 21413+5442N HII 21 41 21.71 +54 42 49.3           ~ 2 0
6 GM 1-12 RNe 21 42 22.0 +54 54 45           ~ 14 0
7 2MASS J21424319+5455519 * 21 42 43.19 +54 55 51.9           ~ 1 0
8 2MASS J21430143+5456183 Y*O 21 43 01.4400 +54 56 17.800           ~ 64 2

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