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J/ApJ/672/398    JHK' photometry of M17 silhouette object       (Ito+, 2008)

Near-infrared silhouette object survey in M17. Ito M., Yamashita T., Sako S., Takami H., Hayano Y., Terada H. <Astrophys. J., 672, 398-409 (2008)> =2008ApJ...672..398I
ADC_Keywords: Clusters, open ; YSOs ; Stars, pre-main sequence ; Photometry, infrared Keywords: infrared: ISM - ISM: individual (M17) - ISM: lines and bands - stars: formation - stars: pre-main sequence Abstract: To study how the structure of the envelopes of young stellar objects (YSOs) evolve, we carried out a deep JHK'-band imaging survey of the M17 star-forming region using a near-infrared camera and the Infrared Camera and Spectrograph with adaptive optics mounted on the Subaru Telescope. In this survey, we found 51 dark silhouettes against bright near-infrared nebula emissions as background lights. They are regarded as envelopes associated with YSOs due to their size and association with the YSOs. We derived size, morphology, extinction, and mass for each silhouette envelope. Description: Imaging observations of the M17 star-forming region were carried out in the J, H, and K' bands on 2003 August 16, 2004 July 5, and 2004 August 7 using the Infrared Camera and Spectrograph (IRCS) with AO on the 8.2m Subaru Telescope on Mauna Kea. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 106 51 Photometry and derived parameters of silhouette and YSOs
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- [IYS2008] Designation (JNN, HNN, KNN or NSN) (1) 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 16 F6.3 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 29 F5.2 arcsec DEs Declination (J2000) 31- 36 F6.3 mag Jmag ?=- J magnitude (1.25±0.16um) 38- 43 F6.3 mag Hmag ?=- H magnitude (1.63±0.30um) 45- 50 F6.3 mag K'mag ?=- K' magnitude (2.12±0.35um) 52 A1 --- l_E(IR) [<] Limit flag on E(IR) (for the HK' objects) 53- 57 F5.3 mag E(IR) ?=- Amount of the IR excess 59- 61 F3.1 solMass Mass ?=- Mass of the central YSO 63- 67 F5.3 mag AV ?=- Silhouette peak extinction 69- 79 A11 --- Morph Morphology of the silhouette (2) 81- 84 F4.2 arcsec Rad1 Distance from the extinction peak to the silhouette border 86- 89 F4.2 arcsec Rad2 ?=- Distance from the YSO in the silhouette to the silhouette border 90 A1 --- --- [-] 91- 94 F4.2 arcsec Rad2u ? Upper limit for the distance from the YSO when interval 96-100 F5.3 solMass MassE Mass of the envelope 101 A1 --- --- [-] 102-106 F5.3 solMass MassEu ? Upper limit of the mass of the envelope when interval
Note (1): J and H represent the JHK' objects and the HK' objects, respectively. Note (2): the morphology is classified in one of the 3 groups Asymmetry, Butterfly or Ellipsoidal
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Apr-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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