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J/ApJS/160/353     Membership of the Orion nebula population     (Getman+, 2005)

Membership of the Orion nebula population from the Chandra Orion Ultradeep Project. Getman K.V., Feigelson E.D., Grosso N., McCaughrean M.J., Micela G., Broos P., Garmire G., Townsley L. <Astrophys. J. Suppl. Ser., 160, 353-378 (2005)> =2005ApJS..160..353G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; X-ray sources ; Infrared sources Keywords: binaries: general - stars: pre-main-sequence - X-rays: stars open clusters and associations: individual (Orion Nebula Cluster) Abstract: The Chandra Orion Ultradeep project (COUP) observation described in a companion paper by Getman et al. (2005, Cat. J/ApJS/160/319) provides an exceptionally deep X-ray survey of the Orion Nebula Cluster and associated embedded young stellar objects. Membership of the region is important for studies of the stellar IMF, cluster dynamics, and star formation. The COUP study detected 1616 X-ray sources. In this study we confirm cloud membership for 1315 stars, identify 16 probable foreground field stars having optical counterparts with discrepant proper motions, and classify the remaining 285 X-ray sources, of which 51 are lightly and 234 heavily obscured. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 90 42 Flaring COUP X-ray sources without optical or near-infrared counterparts table2.dat 90 243 Non-flaring COUP X-ray sources without optical or near-infrared counterparts table3.dat 67 61 COUP double sources with <3" separations table4.dat 111 33 COUP stars with discrepant proper motions
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005) J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997) J/AJ/116/1816 : JHKLMNOPQ photometry in Orion cluster (Hillenbrand+, 1998) J/ApJ/540/236 : KH photometry of Orion Nebula Cluster (Hillenbrand+, 2000) J/A+A/396/513 : Stellar Rotation in the Orion Nebula Cluster (Herbst+, 2002) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- COUP COUP Sequence number (1) 6- 26 A21 --- Name COUP IAU identification (COUP JHHMMSS.s+DDMMSS) 28- 34 F7.1 ct NCt Total (0.5-8keV) net counts in extracted area 36- 42 F7.1 ct NCh Hard (2-8keV) net counts in extracted area 44- 47 F4.2 --- PSF Fraction of PSF in the extracted area 49- 51 F3.1 keV MedE Median energy of extracted photons in the (0.5-8keV) band corrected for background 53- 56 F4.1 [cm-2] NH ? Log of the source hydrogen column density (2) 58- 61 F4.1 keV kT ? Source plasma energy from the spectral fit 63- 69 F7.3 aW/m2 Fh ? Observed hard band flux in units of 10-15erg/s/cm2 71- 74 F4.1 [cm-2] <NH> Log of the average OMC hydrogen column density (3) 76- 85 A10 --- Memb Membership class derived here (G1) 87- 90 F4.2 --- Prob ? Membership probability (only in table 2)
Note (1): Spectral results are unreliable for COUP 84, 257, 495, and 1033 because the fitting procedure failed due to substantial hard-band contamination. Spectral results are unreliable for COUP 479, 505, and 1157 because the fitting procedure failed due to substantial soft-band contamination. Note (2): Inferred from XSPEC spectral fit. Note (3): Derived from the single-dish 13CO map by Bally et al. (1987ApJ...312L..45B).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- COUPW COUP number (West component) 6- 9 I4 --- COUPE COUP number (East component) 11- 13 F3.1 arcsec Sep Separation between the West and East components 15- 17 F3.1 arcmin OffAxis Off-Axis angle 19- 21 F3.1 keV E-W Median energy of West component (4) 22 A1 --- --- [-] 23- 25 F3.1 keV E-E Median energy of West component (4) 27- 30 F4.1 [cm-2] NH-W Log of the West hydrogen column density 31 A1 --- --- [-] 32- 35 F4.1 [cm-2] NH-E ? Log of the East hydrogen column density 37- 41 A5 --- NIR-W NIR crossid for the West component (1) 43- 47 A5 --- Opt-W Optical crossid for the West component (2) 49- 53 A5 --- NIR-E NIR crossid for the East component (1) 55- 59 A5 --- Opt-E Optical crossid for the East component (2) 61- 63 A3 --- Cl-W Membership classification of West component (3) 65- 67 A3 --- Cl-E Membership classification of East component (3)
Note (1): Near-infrared counterpart in the VLT catalog of the first COUP component (McCaughrean et al. 2005, in preparation). Note (2): Optical counterpart of the first COUP component (Hillenbrand 1997, Cat. J/AJ/113/1733 ; Herbst et al. 2002, Cat. J/A+A/396/513). Note (3): Proposed class of the COUP component, defined as follows: M = established member, NM = new member based on variability, NM? = possible new member based on high source density. Note (4): corrected for background
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 --- COUP COUP Sequence number (COUP NNNN in Simbad) 6- 26 A21 --- Name IAU identification (COUP JHHMMSS.s+DDMMSS) 28- 31 F4.1 [cm-2] NH Log of the source hydrogen column density 33- 37 F5.2 [10-7W] LX Observed source luminosity, in units of ergs/s (1) 39- 54 A16 --- NIRName NIR counterpart 56- 60 F5.2 mag Jmag J band magnitude (2) 62- 66 F5.2 mag Hmag H band magnitude (2) 68- 72 F5.2 mag Ksmag K_s_ band magnitude (2) 74- 77 A4 --- [H97b] Optical counterpart identifier (from Hillenbrand, 1997 Cat. J/AJ/113/1733) 79- 82 F4.1 mag Vmag ? V band magnitude 84- 87 F4.1 mag Imag I band magnitude 89- 91 F3.1 mag AV ? Visual extinction from Hillenbrand (1997, Cat. J/AJ/113/1733) 93- 97 F5.2 --- logLX/Lbol ? X-ray emissivity log(LX/Lbol) in the total 0.5-8keV band from Getman et al. (2005, Cat. J/ApJS/160/319) 99-100 I2 --- Prob Proper motion membership probability from Jones & Walker (1988AJ.....95.1755J) 102-109 A8 --- SpType Spectral type (3) 111 A1 --- Field [F] Field star candidate
Note (1): The value of LX was calculated assuming distance of 450pc, which will be incorrect for field stars. Note (2): For the inner region, these are from the VLT merged catalog of McCaughrean et al. (2005, in preparation), while for the outer region they are from the 2MASS catalog. Note (3): Spectral type from the optical spectroscopy of Hillenbrand (1997, Cat. J/AJ/113/1733) updated as described in Getman et al. (2005, Cat. J/ApJS/160/319).
Global Notes: Note (G1): Proposed membership classification, defined as follows: OMC = Orion Molecular Cloud EG = Extragalactic ONC = Orion Nebula Cluster HH = Herbig-Haro objects Unc. = Uncertain
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Dec-2005
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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