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J/AJ/139/950        JHKs photometry in ONC                   (Robberto+, 2010)

A wide-field survey of the Orion nebula cluster in the near-infrared. Robberto M., Soderblom D.R., Scandariato G., Smith K., Da Rio N., Pagano I., Spezzi L. <Astron. J., 139, 950-968 (2010)> =2010AJ....139..950R
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, infrared Keywords: open clusters and associations: individual (Orion Nebula Cluster) - stars: luminosity function, mass function - stars: pre-main sequence Abstract: We present J, H, and Ks photometry of the Orion Nebula Cluster (ONC) obtained at the CTIO/Blanco 4m telescope at Cerro Tololo with the Infrared Side Port Imager camera. From the observations we have assembled a catalog of about ∼7800 sources distributed over an area of approximately 30'x40', the largest of any survey deeper than the Two Micron All Sky Survey (2MASS) in this region. The catalog provides absolute coordinates accurate to about 0.15-arcsec and 3σ photometry in the 2MASS system down to J~=19.5mag, H~=18.0mag, Ks~=18.5mag, enough to detect planetary size objects 1Myr old under AV~=10mag of extinction at the distance of the Orion Nebula. Description: The observations were performed on the nights of 2005 January 1 and 2 in the J, H, and Ks filters using the Double Correlated Sampling readout mode at the CTIO Blanco 4m telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 232 7759 ISPI photometry and astrometry of the Orion Nebula Cluster (ONC)
See also: J/ApJS/183/261 : Optical photometry of the ONC (Da Rio+, 2009) Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 I5 --- ID Running index number <[RSS2010] NNNNN> (1) 7- 15 F9.7 h RAhour ?=- Right Ascension (J2000) (2) 17- 26 F10.7 deg DEdeg ?=- Declination (J2000) (2) 28- 36 F9.7 h RAJhour ?=- J-band Right Ascension (J2000) 38- 47 F10.7 deg DEJdeg ?=- J-band Declination (J2000) 49- 57 F9.7 h RAHhour ?=- H-band Right Ascension (J2000) 59- 68 F10.7 deg DEHdeg ?=- H-band Declination (J2000) 70- 78 F9.7 h RAKhour ?=- Ks-band Right Ascension (J2000) 80- 89 F10.7 deg DEKdeg ?=- Ks-band Declination (J2000) 91- 99 F9.5 mag Jmag ?=- J band PSF magnitude (3) 101-111 F11.8 mag e_Jmag ?=- Uncertainty in Jmag 113-121 F9.5 mag Hmag ?=- H band PSF magnitude (3) 123-132 F10.7 mag e_Hmag ?=- Uncertainty in Hmag 134-141 F8.5 mag Kmag ?=- Ks band PSF magnitude (3) 143-152 F10.7 mag e_Kmag ?=- Uncertainty in Kmag 154-162 F9.5 mag JAp ?=- J band magnitude for 5 pixel radius aperture (3) 164-174 F11.8 mag e_JAp ?=- Uncertainty in JAp 176-184 F9.5 mag HAp ?=- H band magnitude for 5 pixel radius aperture (3) 186-196 F11.8 mag e_HAp ?=- Uncertainty in HAp 198-205 F8.5 mag KAp ?=- Ks band magnitude for 5 pixel radius aperture (3) 207-217 F11.8 mag e_KAp ?=- Uncertainty in KAp 219-220 I2 --- Image [1/11] Image from which the measures are taken 222-223 I2 s Exp [0/30] Exposure time code (5) 225 I1 --- St [0/3] point-like or extended (3) source flag (6) 227-232 I6 --- Clone Multiple detection flag when negative (7)
Note (1): The 174 sources taken from the 2MASS catalog have a progressive ID starting from 10,000. Sources from the Muench et al. (2002, Cat. J/ApJ/573/366, MLLA NNNNA in Simbad) catalog have their original entry number added to either 20,000 or 21,000, depending if the photometry was derived from FLWO or VLT observations (for sources having both measurements, the FLWO photometry has been adopted). Note (2): Based on the Ks band value if the source is detected and not saturated, otherwise the H band or the J band, in the order. Note (3): Calibrated to the photometric 2MASS system. Note (5): Set to either 3 or 30, it refers to the exposure time in seconds of the individual frames building the image from which the photometry has been taken. Sources with exptime=3 are generally saturated in the 30 s exposures. Note (6): Source flag as follows: 1 = source is point-like, detected during the first photometric extraction 2 = source is point-like, detected after PSF subtraction 3 = source appears extended (galaxies, proplyds, diffuse objects in general) Note (7): Sources detected multiple times have the clone value equal to the ID value of their first appearance in the database, multiplied by -1.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-May-2012
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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