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J/AJ/117/446        AFGL 5157 near-IR imaging               (Chen+, 1999)

Near-infrared imaging of the star-forming region AFGL 5157. Chen Y., Yao Y., Yang J., Hirao T., Ishii M., Nagata T., Sato S. <Astron. J. 117, 446 (1999)> =1999AJ....117..446C
ADC_Keywords: Nebulae ; Photometry, infrared ; Stars, pre-main sequence Keywords: infrared radiation - ISM: individual (AFGL 5157) - ISM: jets and outflows - reflection nebulae - stars: formation Abstract: We present near-infrared images of the star-forming region AFGL 5157 in the JHK broadband filters and H2v=1-0S(1) narrowband filter. The images reveal a dense cluster of stars and infrared nebulosities associated with previously known infrared sources. Of 54 near-infrared sources detected in the nebula, NGC 1985, 12 exhibit infrared excesses typical of T Tauri stars, Herbig Ae/Be stars, and protostars. The magnitude and color distribution of the cluster of stars in the nebula are found to be different from those outside the nebular region. The K'-magnitude distribution of the cluster is quite flat, while the noncluster is peaked toward the low magnitude. The [H-K'] color of the cluster also displays 0.3 mag redder than that of the noncluster. The infrared nebula displays a bright nucleus with two spirals extended to the north and south. In light of the color properties of the nebula, we propose a shell model for the nebular structure that could be formed by star-forming activity of the central cluster. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 05 37 47.8 +31 59 24 AFGL 5157 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 39 170 Near-infrared photometry of AFGL 5157 table2.dat 35 13 Positions and flux measurements of H2 emission in AFGL 5157
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NIRS [1/170] Identification number ([CYY99] NIRS NNN in Simbad) 4 A1 --- n_NIRS [b] saturation (1) 6- 10 F5.1 arcsec oRA Offset in right ascension (G1) 12- 17 F6.1 arcsec oDE Offset in declination (G1) 19- 23 F5.2 mag K'mag K' magnitude 25- 29 F5.2 mag [H-K'] Colour index [H-K'] 31- 35 F5.2 mag [J-H] ? Colour index [J-H]
Note (1): b: Abnormal bluer colors due to saturation
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- H2 [1/22]? H2 knot designation ([CYY99] H2 NN in Simbad) 3 A1 --- n_H2 [D] D: Diffuse (no H2 number) 5- 9 F5.1 arcsec oRA Offset in right ascension (G1) 11- 15 F5.1 arcsec oDE Offset in declination (G1) 17- 22 F6.2 10-20W/cm2/um Flux H2 knots (2.12µm) flux 24- 25 I2 arcsec Aper Aperture employed for H2 measurements 27- 29 F3.1 arcsec FWHM ? H2 knots FWHM size 31- 33 A3 --- Morph Morphology (2) 35 I1 --- Ref [1/2] References (3)
Note (2): Abbreviations used: BS = Bow-shaped E = Elongated K = Knot S = Shell Note (3): 1 = Torrelles et al., 1992ApJ...384..528T 2 = This work
Gloval Notes: Note (G1): Coordinates offset from the bright references star 1 (NIRS 104), located at RA=05 34 32.6, DE=+31 57 38 (B1950.0)
History: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 12-Mar-1999
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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