J/A+A/394/225 JHK photometry around RAFGL 7009S (Zavagno+, 2002)
Near-infrared imaging of RAFGL 7009S.
Zavagno A., Deharveng L., Nadeau D., Caplan J.
<Astron. Astrophys. 394, 225 (2002)>
=2002A&A...394..225Z 2002A&A...394..225Z
ADC_Keywords: Infrared sources ; Photometry, infrared
Keywords: stars: formation - stars: pre-main sequence - stars: imaging -
stars: individual: RAFGL7009S
Abstract:
RAFGL7009S is a deeply embedded massive young stellar objet (YSO)
showing strong ice and saturated silicate absorption features in the
mid infrared. It is associated with the ultracompact H II region
G25.65+1.05, which may be excited by a B1V star.
We have obtained JHK images of a 1' field centred on this YSO. In K we
detect a non-resolved object coinciding with the radio continuum
emission peak. Considering the high extinction towards this source
(AV≥100mag), the observed K emission is more than 7∼mag in excess
of that expected for a B1V star. We suggest that this emission is
mainly due to scattering of the central zone emission, as recently
found for a sample of embedded massive YSOs associated with 3.1µm
H2O ice absorption (Ishii et al., 2002AJ....124..430I 2002AJ....124..430I). We estimate
the YSO's age to be 2x104 years. The outflow, the methanol maser
emission and the strong ice absorption features suggest the presence
of a dense medium very close to the star, possibly a disk.
The observations were obtained with the Montreal Near-IR Camera
(MONICA, Nadeau et al., 1994PASP..106..909N 1994PASP..106..909N) mounted at the F/8
Cassegrain focus of the 3.6-m Canada-France-Hawaii Telescope on 1996
July 1 UT. Frames were obtained through the J, H and K broad-band
filters with total integration times of 840s, 160s and 100s Details
about the instrumentation, the calibration and the data analysis can
be found in Deharveng et al. (1999, Cat. J/A+A/344/943).
Objects:
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RA (2000) DE Designation(s)
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18 34 19.7 -05 59 44 RAFGL 7009S = IRAS 18316-0602
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 174 JHK photometry of the 174 stars of observed field
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/174] Sequential star number
5- 12 F8.3 pix Xpos Star x position on image
14- 21 F8.3 pix Ypos Star y position on image
23- 29 F7.3 mag Kmag ? Star K magnitude
31- 36 F6.3 mag J-K ? Star (J-K) colour index
38- 43 F6.3 mag H-K ? Star (H-K) colour index
45- 50 F6.3 mag J-H ? Star (J-H) colour index
52- 58 F7.3 mag Jmag ? Star J magnitude
60- 61 I2 h RAh Right ascension (B1950)
63- 64 I2 min RAm Right ascension (B1950)
66- 71 F6.3 s RAs Right ascension (B1950)
73 A1 --- DE- Declination sign (B1950)
74- 75 I2 deg DEd Declination (B1950)
77- 78 I2 arcmin DEm Declination (B1950)
80- 84 F5.2 arcsec DEs Declination (B1950)
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Acknowledgements: Annie Zavagno
(End) Patricia Bauer [CDS] 23-Aug-2002