J/MNRAS/390/1185 JHK photometry in 2 star-forming regions (Anandarao+, 2008)
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., Kumar M.S.N.
<Mon. Not. R. Astron. Soc., 390, 1185-1194 (2008)>
=2008MNRAS.390.1185A 2008MNRAS.390.1185A
ADC_Keywords: Associations, stellar ; H II regions ; Photometry, infrared
Keywords: stars: formation - dust, extinction - H II regions - infrared: stars -
radio continuum: general
Abstract:
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
∼0.5arcsec. Our results reveal details of stellar content to a
completeness limit (90 per cent) of J=18.5, H=18.0 and K=17.5mag 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 1.28GHz covering the entire
region surrounding the two star-forming clouds.
Description:
Subarcsec resolution JHK photometry was performed at UKIRT during 2005
July 17 on the two objects under excellent seeing conditions
(∼0.5arcsec) using the UFTI (HAWAII- 1 1024x1024 ) camera.
The radio continuum observations in the 1.280-GHz frequency band
(with a bandwidth of 16MHz) were made on 2003 August 1 at the Giant
Metrewave Radio Telescope (GMRT), operated by National Centre for
Radio Astrophysics (NCRA), Tata Institute of Fundamental Research
(TIFR) near Pune (India).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 49 86 UKIRT JHK photometry of sources in the central
HII regions (Cluster 1) of IRAS 21413+5442
table2.dat 49 62 UKIRT JHK photometry of sources in the central
cluster (Cluster 2C) of IRAS 21407+5441
table3.dat 49 30 UKIRT JHK photometry of sources in the
north-eastern cluster (Cluster 2N) of
IRAS 21407+5441
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Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 31 F6.3 mag Hmag UKIRT H magnitude
33- 36 F4.2 mag H-K UKIRT H-K colour index
38- 41 F4.2 mag J-H ? UKIRT colour index (1)
43- 46 F4.1 mag AV ? Absorption in V band
48- 49 I2 --- Seq ? Sequential number for stars with IR excesses
in T Tauri region and beyond (2)
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Note (1): The stars listed after the gap are detected only in HK bands.
Note (2): Stars identified as:
* [AVG2008] Cluster 1 NN for table1.dat
* [AVG2008] Cluster 2C NN for table2.dat
* [AVG2008] Cluster 2N NN for table3.dat
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-May-2009