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J/AJ/120/1426       Chandra sources in ONC & BN-KL            (Garmire+, 2000)

Chandra X-ray observatory study of the Orion nebula cluster and BN/KL region. Garmire G., Feigelson E.D., Broos P., Hillenbrand L.A., Pravdo S.H., Townsley L., Tsuboi Y. <Astron. J. 120, 1426 (2000)> =2000AJ....120.1426G
ADC_Keywords: X-ray sources ; Cross identifications Misson_Name: Chandra Keywords: infrared radiation - ISM: individual (Orion Nebula) - stars: activity - stars: pre-main-sequence - X-rays Description: About 1000 X-ray emitting young premain-sequence (PMS) stars distributed in mass from ∼0.05M brown dwarfs to a ∼50M O star are detected in an image of the Orion Nebula obtained with the Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-Ray Observatory. The sources in the Becklin-Neugebauer/Kleinman-Low region of massive star formation are discussed in detail. Note: A more extensive and accurate list is in preparation, based on more Chandra data which will have more sources and many more columns of information. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 24 973 ACIS sources in the ONC table2.dat 76 27 ACIS sources near the Becklin-Neugebauer (BN) object notes.dat 80 39 Individual notes
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ONC Sequential number of ACIS source in ONC 7 I1 h RAh ACIS source right ascension (J2000.0) 9- 10 I2 min RAm ACIS source right ascension (J2000.0) 12- 15 F4.1 s RAs ACIS source right ascension (J2000.0) 17 A1 --- DE- ACIS source declination sign (J2000.0) 18 I1 deg DEd ACIS source declination (J2000.0) 20- 21 I2 arcmin DEm ACIS source declination (J2000.0) 23- 24 I2 arcsec DEs ACIS source declination (J2000.0)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- BN Sequential number of ACIS source in BN (1) 4 I1 h RAh ACIS source right ascension (J2000.0) 6- 7 I2 min RAm ACIS source right ascension (J2000.0) 9- 13 F5.2 s RAs ACIS source right ascension (J2000.0) 15 A1 --- DE- ACIS source declination sign (J2000.0) 16 I1 deg DEd ACIS source declination (J2000.0) 18- 19 I2 arcmin DEm ACIS source declination (J2000.0) 21- 24 F4.1 arcsec DEs ACIS source declination (J2000.0) 26- 28 I3 ct/ks Counts ACIS source counts extracted from a 15 circle in the 0.28 keV band with ASCA grades after correction for charge-transfer inefficiency. A background of 2 counts per source has been subtracted. 30- 33 F4.1 [cm-2] logNH ? ACIS source hydrogen column density 34 A1 --- u_logNH rms uncertainty on logNH 36- 38 F3.1 arcsec theta ? Offset between the ACIS source and its counterpart (2) 40- 44 A5 --- Class Counterpart class (3) 47- 53 A7 --- IDo Optical counterpart designation (4) 55- 58 F4.1 mag Imag ? Optical counterpart I magnitude 60- 67 A8 --- IDi Infrared counterpart designation (4) 70- 73 F4.1 mag Kmag ? Infrared counterpart K magnitude 75 A1 --- Note Individual note in notes.dat file
Note (1): CXOONC JHHMMSS.s+DDMMSS in Simbad Note (2): Offset based on on K-band (Hillenbrand & Carpenter, 2000ApJ...540..236H in press) or radio positions (Felli et al. 1993A&AS..101..127F, adjusted to the astrometry of Menten & Reid, 1995ApJ...445L.157M). Note (3): Classification: ONC: ACIS sources are likely members of the Orion Nebula cluster, generally optically bright, lightly-absorbed stars IR: ACIS sources have infrared but not optical counterparts and are likely embedded young stars X-ray: ACIS sources have no photospheric stellar counterparts Note (4): Counterpart designations: JW: Jones & Walker 1988AJ.....95.1755J (JW NNNN in Simbad) PC: Prosser et al. 1994ApJ...421..517P (PSH NNN in Simbad) HC: Hillenbrand & Carpenter, 2000ApJ...540..236H BN and Source n : Lonsdale et al. (1982AJ.....87.1819L). BN: Becklin-Neugebauer source = NAME Orion-BN in Simbad Source n = LBLS n in Simbad
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1 A1 --- Note Note 3- 80 A78 --- Text Text of the note
History: From AJ electronic version, table1 copied at ftp://ftp.astro.psu.edu/pub/edf/orion/garmire.tab1.dat
(End) James Marcout, Patricia Bauer [CDS] 05-Dec-2000
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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