J/AJ/128/2364 JHK photometry of RCW 95 HII region (Roman-lopes+, 2004)
A rich star-forming region in the direction of RCW 95.
Roman-lopes A., Abraham Z.
<Astron. J., 128, 2364-2373 (2004)>
=2004AJ....128.2364R 2004AJ....128.2364R
ADC_Keywords: H II regions ; Stars, pre-main sequence ; Photometry, infrared
Keywords: dust, extinction - H II regions - infrared: stars - stars: formation -
stars: pre-main-sequence
Abstract:
Near-IR imaging in the direction of the IRAS 15408-5356 point source,
which is associated with the RCW 95 HII region, revealed a young and
massive stellar cluster. We detected 136 member candidates up to our
completeness limit, embedded in an infrared nebula and concentrated in
an area of about 3pc2. About 60% of the candidates detected in all
three of the J, H, and K bands present infrared excess at 2.2µm. he
UV photons provided by the most massive stars are enough to explain
the observed free-free emission at radio wavelengths and the
integrated infrared luminosity produced by the heated dust. The
near-IR counterpart of the IRAS point source was identified using a
more accurate position from the Midcourse Space Experiment (MSX)
catalog; it coincides with the peak of emission in the MSX mid-IR
bands. The measured integrated flux density of the infrared nebula at
the K band is compatible with the expected free-free emission derived
from the radio data, but an excess at the J and H bands was detected
and may be due to either nonhomogeneous absorption across the nebula
or to the presence of scattered stellar light, more prominent at
smaller wavelengths.
Description:
The imaging observations were performed in two epochs, 2000 May and
2003 May, with the Near Infrared Camera (CamIV) of the Laboratorio
Nacional de Astrofisica (LNA), Brazil.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 136 List of the Selected Near-Infrared Sources
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- IRS The IRS name, [RA2004b] IRS NNN in Simbad
5- 6 I2 h RAh Hour of right ascension (J2000)
8- 9 I2 min RAm Minute of right ascension (J2000)
11- 15 F5.2 s RAs Second of right ascension (J2000)
17 A1 --- DE- Sign of the declination (J2000)
18- 19 I2 deg DEd Degree of declination (J2000)
21 I1 arcmin DEm Arcminute of declination (J2000)
23- 26 F4.1 arcsec DEs Arcsecond of declination (J2000)
28- 32 F5.2 mag J2mag ? 2MASS J-band magnitude
34- 35 I2 cmag e_J2mag ? The uncertainty in J2mag
37- 41 F5.2 mag Jmag ? Near Infrared Camera J-band magnitude
43- 44 I2 cmag e_Jmag ? The uncertainty in Jmag
46- 50 F5.2 mag H2mag ? 2MASS H-band magnitude
52- 53 I2 cmag e_H2mag ? The uncertainty in H2mag
55- 59 F5.2 mag Hmag Near Infrared Camera H-band magnitude
61- 62 I2 cmag e_Hmag The uncertainty in Hmag
64- 68 F5.2 mag Ksmag ? 2MASS K-band magnitude
70- 71 I2 cmag e_Ksmag ? The uncertainty in K2mag
73- 77 F5.2 mag Kmag ? Near Infrared Camera K-band magnitude
79- 80 I2 cmag e_Kmag ? The uncertainty in Kmag
82- 85 A4 --- SpType MK Spectral type
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 23-Aug-2005