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J/A+A/525/A1        JHK photometry of CBJC 8 sources         (Persi+, 2011)

The distant young embedded stellar cluster CBJC 8 associated with G085.40-0.00. Persi P., Tapia M., Gomez M. <Astron. Astrophys. 525, A1 (2011)> =2011A&A...525A...1P
ADC_Keywords: Associations, stellar ; H II regions ; Photometry, infrared ; Photometry, millimetric/submm Keywords: stars: formation - HII regions - ISM: clouds - masers - stars: protostars - ISM: jets and outflows Abstract: The infrared cluster CBJC 8 is associated with a 6.7GHz methanol maser and a compact radio-continuum source, G85.40-0.00. It is located at a distance of about 8kpc. The aim is to study the characteristics of this distant and compact embedded cluster and derive the properties of its stellar population. We present new ground-based near- and mid-imaging observations of this region. The calibrated images were analysed together with archive Spitzer IRAC images. Based on the discovery of a considerable fraction of embedded sources with infrared excess emission that are concentrated within a radius around 16arcsec centred near the position of the compact HII region G85.40-0.00, we were able to confirm the presence of a very young embedded cluster. It was found to contain more than 58 members brighter than MK=2.6, with two-thirds of them showing significant near- or mid-IR excess emission. Spectral energy distributions and extrapolated total luminosities are presented for nine sources with large mid-infrared excesses that were measured in all four IRAC bands. For the brightest of these, G8540A, which is associated with a methanol maser and a compact HII region, we fitted a model of an infalling envelope plus disc plus central star to its observed 1.6 to 850um fluxes to get an idea of its physical properties. We also report the presence of a single 2.12um molecular hydrogen line emission knot near the centre of the cluster, suggesting the outflow activity. Description: Coordinates (J2000) and JHK photometry are given for the 493 sources detected with PANIC on Baade Telescope in an area of 111"x111" centred on G85.40+0.00 as well as photometry in the four IRAC bands measured on archive frames of the same area. Objects: ----------------------------------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------------------------------- 20 54 14.3 +44 54 05 CBJC 8 = [CBJ2002] 8 = [BDB2003] G085.41+00.00 ----------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file jhk.dat 60 393 Coordinates and JHK photometry of all sources irac.dat 72 32 Coordinates and IRAC photometry of all sources
Byte-by-byte Description of file: jhk.dat
Bytes Format Units Label Explanations
2- 3 I2 h RAh Right ascension (J2000.0) 5- 6 I2 min RAm Right ascension (J2000.0) 8- 12 F5.2 s RAs Right ascension (J2000.0) 14 A1 --- DE- Declination sign (J2000.0) 15- 16 I2 deg DEd Declination (J2000.0) 18- 19 I2 arcmin DEm Declination (J2000.0) 21- 24 F4.1 arcsec DEs Declination (J2000.0) 27- 31 F5.2 mag Jmag ? 2MASS J magnitude 33- 36 F4.2 mag e_Jmag ? Error in J magnitude 39- 43 F5.2 mag Hmag ? 2MASS H magnitude 45- 48 F4.2 mag e_Hmag ? Error in H magnitude 51- 55 F5.2 mag Kmag 2MASS K magnitude 57- 60 F4.2 mag e_Kmag Error in K magnitude
Byte-by-byte Description of file: irac.dat
Bytes Format Units Label Explanations
2- 3 I2 h RAh Right ascension (J2000.0) 5- 6 I2 min RAm Right ascension (J2000.0) 8- 12 F5.2 s RAs Right ascension (J2000.0) 14 A1 --- DE- Declination sign (J2000.0) 15- 16 I2 deg DEd Declination (J2000.0) 18- 19 I2 arcmin DEm Declination (J2000.0) 21- 24 F4.1 arcsec DEs Declination (J2000.0) 27- 31 F5.2 mag [3.6] ? Spitzer/IRAC 3.6um magnitude 33- 36 F4.2 mag e_[3.6] ? Error in [3.6] magnitude 39- 43 F5.2 mag [4.5] ? Spitzer/IRAC 4.5um magnitude 45- 48 F4.2 mag e_[4.5] ? Error in [4.5] magnitude 51- 55 F5.2 mag [5.8] ? Spitzer/IRAC 5.8um magnitude 57- 60 F4.2 mag e_[5.8] ? Error in [5.8] magnitude 63- 67 F5.2 mag [8.0] ? Spitzer/IRAC 8um magnitude 69- 72 F4.2 mag e_[8.0] ? Error in [8] magnitude
Acknowledgements: Paolo Persi, paolo.persi(at)iasf-roma.inaf.it
(End) Patricia Vannier [CDS] 25-Nov-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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