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J/ApJ/574/258  X-ray-emitting young stars in the Orion nebula (Feigelson+, 2002)

X-ray-emitting young stars in the Orion nebula. Feigelson E.D., Broos P., Gaffney III J.A., Garmire G., Hillenbrand L.A., Pravdo S.H., Townsley L., Tsuboi Y. <Astrophys. J. 574, 258 (2002)> =2002ApJ...574..258F
ADC_Keywords: Clusters, open ; Stars, early-type ; X-ray sources Keywords: open clusters and associations: individual (Orion Nebula Cluster) - stars: activity - stars: early-type - stars: low-mass, brown dwarfs - stars: pre-main-sequence - X-rays: stars Abstract: The Orion Nebula Cluster (ONC) and the molecular cloud (OMC) in its vicinity have been observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23hr exposure in two observations, on 1999 October 12 and 2000 April 1. We detect 1075 X-ray sources, most with sub-arcsecond positional accuracy. Ninety-one percent of the sources are spatially associated with known stellar members of the cluster, and an additional 7% are newly identified deeply embedded cloud members. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 141 1075 ACIS ONC sources and stellar counterparts notes2.dat 80 304 Individual notes to table2.dat table3.dat 120 1075 X-ray properties of ONC sources notes3.dat 80 461 Individual notes to table3.dat table4.dat 68 101 X-Ray Sources without Stellar Identifications table5.dat 117 52 High- and Intermediate-Mass ONC Stars table6.dat 94 30 X-Ray Detections of Very Low-Mass ONC Objects
See also: J/ApJ/437/361 : Einstein survey of the Orion nebula region (Gagne+ 1994) J/ApJ/584/911 : X-rays in the Orion nebula cluster (Feigelson+, 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [FBG2002] Source number 5 A1 --- n_[FBG2002] [*] *: note in notes2.dat file 7- 21 A15 --- CXOONCJ IAU designation 24- 31 F8.5 deg RAdeg Right ascension in decimal degrees (J2000) 34- 41 F8.5 deg DEdeg Declination in decimal degrees (J2000) 42- 46 F5.1 arcmin Offaxis Offaxis angle 49- 53 A5 --- Prev [a-f ] Previous X-ray detections (2) 56- 64 A9 --- ID Stellar identification (3) 67- 69 F3.1 arcsec Sep ? Separation between source and stellar ID 72- 76 F5.3 [K] logTeff ? Log effective temperature 79- 83 F5.2 [solLum] logLbol ? Log bolometric luminosity 85- 89 F5.2 mag AV ? Visual absorption 92- 96 F5.2 [solMass] logM ? Log mass 99-102 F4.2 [yr] logt ? Log age 105-109 F5.2 mag DelK ? K-band excess 111-119 A9 --- Other Other stellar properties (4) 120-124 F5.2 d Period ? Rotational period 126-128 A3 --- r_Period Reference for Period (5) 130-135 A6 --- Note Notes to Table 2 (6)
Note (2): Previous X-ray source: a = Einstein Observatory b = ROSAT PSPC c = ROSAT HRI d = ASCA e = Chandra ACIS-I f = Chandra ACIS-S3 Note (3): Stellar identification use the following acronyms: CHS = Carpenter et al., 2001, Cat. J/AJ/121/3160 H = Hillenbrand, 1997, Cat. J/AJ/113/1733 HC = Hillenbrand & Carpenter, 2000, Cat. J/ApJ/540/236 JW = Jones & Walker, 1988AJ.....95.1755J P = Parenago, 1954TrSht..25....1P PSH = Prosser et al., 1994ApJ...421..517P Note (4): Stellar properties use the following abbreviations: FIR = mid- or far-infrared source HH = Herbig-Haro object of host star L = L-band excess N = N-band excess pd = proplyd and/or disk imaged r = radio continuum source wc = star with wind collision fronts Note (5): Period references use the following symbols: C = Carpenter et al., 2001, Cat. J/AJ/121/3160 H = Herbst et al., 2000AJ....119..261H, 2001ApJ...554L.197H S = Stassun, 1999, Cat. J/AJ/117/2941 Note (6): Notes: id = Stellar identification p = Rotational period x = X-ray image
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [FBG2002] Source number 5 A1 --- n_[FBG2002] [*] *: note in notes3.dat file 7- 21 A15 --- CXOONCJ IAU designation 24- 28 I5 ct Cxtr Extracted X-ray counts 31- 32 I2 ct Bxtr ? Background X-ray counts 35- 38 F4.1 arcsec Rxtr ? Extraction radius 41- 44 F4.2 --- fPSF Point spread function fraction 47- 51 F5.1 ct/s CR1 ? Count rate, first observation 54- 58 F5.1 ct/s CR2 ? Count rate, second observation 61- 66 A6 --- Var Variability class (G1) 69 A1 --- l_logNH Limit flag on logNH 70- 73 F4.1 [cm-2] logNH ? Log hydrogen column density 76 A1 --- l_kT Limit flag on kT 77- 80 F4.1 keV kT ? Plasma energy (1 temperature model) or first plasma energy (2 temperature model) 81 A1 --- --- [/] Dash when 2 temperature model 82 A1 --- l_kT2 Limit flag on kT2 83- 86 F4.1 --- kT2 ? Second plasma energy value (2 temperature model) 88 A1 --- SpFlag [*] Spectral feature flag (2) 90 A1 --- l_logLs Limit flag on logLs 91- 94 F4.1 [10-7W] logLs ? Log soft band X-ray luminosity 96 A1 --- l_logLh Limit flag on logLh 97-100 F4.1 [10-7W] logLh ? Log hard band X-ray luminosity 103-106 F4.1 [10-7W] logLt ? Log total band X-ray luminosity 109-112 F4.1 [10-7W] logLc ? Log absorption-corrected X-ray luminosity 115-117 A3 --- Note Notes (3)
Note (2): for faint sources, logNH and kT are highly uncertain and are used only as rough characterizations of spectral shape. Note (3): the following symbols are used: f = faint source warning (spectral parameters are only used as a spline fit for obtaining logLt) p = photon pileup warning s = spectral issue v = variability issue
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [FBG2002] Source number 5 A1 --- n_[FBG2002] [abc] Note on [FBG2002] (1) 7- 21 A15 --- CXOONCJ IAU designation 23- 26 I4 ct Cxtr Counts in the total 0.5-8keV band from within radius Rxtr 28- 35 A8 --- Var Variability flag (G1) 38 A1 --- l_logNH Limit flag on logNH 39- 42 F4.1 [cm-2] logNH ? Equivalent hydrogen column density of absorbing interstellar material for 1 temperature model only 44 A1 --- l_kT Limit flag on kT 45- 48 F4.1 keV kT ? Plasma energy (1 temperature model) or first plasma energy value (2 temperature model) 49 A1 --- --- [/] Dash when two-temperature fit 50 A1 --- l_kT2 Limit flag on kT2 51- 54 F4.1 keV kT2 ? Second plasma energy value (2 temperature model) 57- 60 F4.1 [10-7W] logLt Broadband luminosity 62- 68 A7 --- Class Suggested class (3)
Note (1): Individual notes are as follows: a: Radio source Q, 2.5mJy at 2cm (Felli et al., 1993A&AS..101..127F). b: This X-ray source lies 1.5" from IRc 14, a luminous mid-infrared member of the OMC 1 cluster (Gezari et al., 1998ApJ...509..283G). c: This X-ray source coincides with a SIMBAD listing for Parenago 1867 (V=15.8). However, examination of the original charts of Parenago (1954TrSht..25....1P) indicates that the SIMBAD position is probably incorrect: Parenago 1867 corresponds to HC 304∼3" to the south. The X-ray position is resolvable from other stars in the region and has no counterpart with V<20 or K<18. Note (3): Classifiation is as follows: Embd/Bk : Heavily absorbed ACIS sources which do not coincide with dense molecular cloud cores OMC 1 : Embedded stars associated with the OMC 1 = Orion KL core OMC 1N : Embedded stars associated with OMC 1N core OMC 1S : Embedded stars associated with OMC 1S core ONC : Orion Nebula Cluster member
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [FBG2002] ? Source number 6- 20 A15 --- CXOONCJ IAU designation 22- 27 A6 --- P/JW Parenago or JW designation 30- 44 A15 --- Name Other name 46- 50 F5.2 mag Vmag ? V magnitude 52- 59 A8 --- SpType MK Spectral type 61- 64 F4.2 [solLum] logLbol Bolometric luminosity 66- 69 F4.2 [solMass] logM Mass 71- 75 I5 ct Cxtr ? Counts in the total 0.5-8keV band from within radius Rxtr 77- 84 A8 --- Var Variability flag (G1) 86 A1 --- l_logNH Limit flag on logNH 87- 91 F5.2 [cm-2] logNH ? Equivalent hydrogen column density of absorbing interstellar material for one-temperature plasma model 93- 95 F3.1 keV kT ? Plasma energy ( 1 temperature model) or first value of plasma energy (2 temperature model) 96 A1 --- --- [/] Dash when 2 temperature model 97 A1 --- l_kT2 Limit flag on kT2 98- 99 I2 keV kT2 ? Second plasma energy value (2 temperature model) 101 A1 --- l_logLs Limit flag on logLS 102-106 F5.2 [10-7W] logLs ? Softband luminosity 107 A1 --- l_logLt Limit flag on logLt 108-112 F5.2 [10-7W] logLt Broadband luminosity 113 A1 --- l_log(Lt/Lbol) Limit flag on log(Lt/Lbol) 114-117 F4.1 [-] log(Lt/Lbol) Broadband-to-bolometric luminosity ratio
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [FBG2002] Source number 5 A1 --- n_[FBG2002] [*] Note on [FBG2002] 7- 21 A15 --- CXOONCJ IAU designation 23- 31 A9 --- Name Other name 33- 37 F5.2 mag Kmag K magnitude 39- 43 F5.2 mag H-K ? H-K colour index 45 A1 --- l_KMAG Limit flag on KMAG 46- 49 F4.2 mag KMAG Absolute K magnitude 51 A1 --- l_Mass Limit flag on Mass 52- 55 F4.2 solMass Mass Mass 57- 59 I3 ct Cxtr Counts in the total 0.5-8keV band from within radius Rxtr 61- 68 A8 --- Var Variability flag (G1) 69 A1 --- l_logNH Limit flag on logNH 70- 73 F4.1 [cm-2] logNH ? Hydrogen column density 75 A1 --- l_kT Limit flag on kT 76- 79 F4.1 keV kT ? Plasma energy (1 temperature model) or first plasma energy value (2 temperature model) 80 A1 --- --- [/] Dash when 2 temperature model 81 A1 --- l_kT2 Limit flag on kT2 82- 83 I2 keV kT2 ? Second plasma energy value (2 temperature model) 85- 88 F4.1 [10-7W] logLt Broadband luminosity 90 A1 --- l_log(Lt/Lbol) Limit flag on log(Lt/Lbol) 91- 94 F4.1 [-] log(Lt/Lbol) Broadband-to-bolometric luminosity ratio
Byte-by-byte Description of file: notes2.dat notes3.dat
Bytes Format Units Label Explanations
1- 15 A15 --- CXOONCJ Object name 16 A1 --- n_Name [*] *: the object (053520.5-05171), is not in any tables 17- 80 A64 --- Text Text of the note
Global notes: Note (G1): Variability flags are: Const. : constant Flare : flare LT Var. : long-term variability Pos. fl. : possible flare
History: * 13-Sep-2002: From electronic version of the journal * 17-Feb-2005: the last digit of the CXOONCJ name in the notes was originally missing and has been added. A typo in the note of 053520.4-051714 was corrected. * 21-Feb-2006: 3 identifications corrected in table2.dat for sources 235 (was originally JW 311), 393 (was originally PSH 93) 685 (was originally PSH 248)
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 13-Sep-2002
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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