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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
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