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J/ApJ/677/401      Xray properties of protostars in ONC      (Prisinzano+, 2008)

X-ray properties of protostars in the Orion nebula. Prisinzano L., Micela G., Flaccomio E., Stauffer J.R., Megeath T., Rebull L., Robberto M., Smith K., Feigelson E.D., Grosso N., Wolk S. <Astrophys. J., 677, 401-424 (2008)> =2008ApJ...677..401P
ADC_Keywords: YSOs ; X-ray sources ; Photometry, infrared ; Cross identifications ; Clusters, open Keywords: open clusters and associations: general - stars: activity - open clusters and associations: individual (Orion Nebula Cluster) - stars: pre-main sequence - X-rays: stars Abstract: The origin and evolution of the X-ray emission in very young stellar objects (YSOs) are not yet well understood because it is very hard to observe YSOs in the protostellar phase. Using COUP data, we study the X-ray properties of stars in the ONC in different evolutionary classes: luminosities, hydrogen column densities NH, effective plasma temperatures, and time variability are compared to understand if the interaction between the circumstellar material and the central object can influence the X-ray emission. We have assembled the deepest and most complete photometric catalog of objects in the ONC region from the UV to 8um using data from the HST Treasury Program; deep and almost simultaneous UBVI and JHK images taken, respectively, with WFI at ESO 2.2m and ISPI at CTIO 4m telescopes; and Spitzer IRAC imaging. We select high-probability candidate Class 0-I protostars, a sample of "bona fide" Class II stars, and a set of Class III stars with IR emission consistent with normal photospheres. Our principal result is that Class 0-Ia objects are significantly less luminous in X-rays, in both the total and hard bands, than the more evolved Class II stars with mass larger than 0.5M; the latter show X-ray luminosities similar to those of Class 0-Ib stars. Description: A detailed description of the optical-IR observations is given in Table 1. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 100 8 Log of the new optical-IR observations used in this work table2.dat 121 23 NIR photometry of Class 0/Ia candidates table3.dat 121 22 NIR photometry of Class 0/Ib candidates table4.dat 121 148 NIR photometry of Class II candidates table5.dat 121 205 NIR photometry of Class III candidates table8.dat 77 130 X-ray parameters of the Class II candidates table9.dat 77 160 X-ray parameters of the Class III candidates table14.dat 46 45 Literature Class 0/I counterparts
See also: J/ApJ/574/258 : X-ray-emitting young stars in the Orion nebula (Feigelson+, 2002) J/ApJ/582/382 : Chandra X-ray sources in Orion Nebula Cluster (Flaccomio+, 2003) J/ApJ/584/911 : X-rays in the Orion nebula cluster (Feigelson+, 2003) J/AJ/130/1763 : 11.7µm point sources in Orion (Smith+, 2005) J/AJ/129/1534 : Mid-IR photometry in the Orion Nebula (Robberto+, 2005) J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005) J/ApJS/160/450 : X-ray emission in Orion Nebula young stars (Flaccomio+, 2005) J/ApJ/660/704 : Optical and X-ray variability of ONC PMS (Stassun+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- ObsDate Night(s) of observation 15- 28 A14 --- Tel Telescope used 29 A1 --- f_Tel [d] Flag for Spitzer (1) 31- 35 A5 --- Cam Camera used 37- 56 A20 --- Filter Filters 57 A1 --- f_Filter [c] Flag for WFPC2 filters (2) 59- 68 A10 s Exp Exposure time per filter 70- 80 A11 --- Lim Magnitude limit (3) 82- 98 A17 --- Field Field of view 100 I1 --- Ref Reference (4)
Note (1): d = Data part of the Spitzer GTO Programs 43 and 50 taken in high dynamic range mode using 0.6 and 12s at each position. Note (2): c = WFPC2 filters F336W, F439W, F656N, and F814W correspond to the standard filters U, B, Hα, and I, respectively. Note (3): Magnitude limit computed for stars with photometric errors smaller than 0.1. Note (4): References as follows: 1 = Robberto et al. (2005AAS...20714601R); 2 = M. Robberto et al. (2008ApJ...687L..83R); 3 = Megeath et al. (2005IAUS..227..383M)
Byte-by-byte Description of file: table[2345].dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequence number (<[PMF2008] NNN> in Simbad) 5- 8 I4 --- COUP ? The COUP identification number 10- 19 F10.7 deg RAdeg Right Ascension in decimal degrees (J2000) 21- 30 F10.7 deg DEdeg Declination in decimal degrees (J2000) 32- 37 F6.3 mag Jmag ? 2MASS J band magnitude 39- 43 F5.3 mag e_Jmag ? Uncertainty in Jmag 45- 50 F6.3 mag Hmag ? 2MASS H band magnitude 52- 56 F5.3 mag e_Hmag ? Uncertainty in Hmag 58- 63 F6.3 mag Kmag ? 2MASS K band magnitude 65- 69 F5.3 mag e_Kmag ? Uncertainty in Kmag 71- 76 F6.3 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude 78- 82 F5.3 mag e_3.6mag Uncertainty in 3.6mag 84- 89 F6.3 mag 4.5mag ? Spitzer/IRAC 4.5 micron band magnitude 91- 95 F5.3 mag e_4.5mag ? Uncertainty in 4.5mag 97-102 F6.3 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude 104-108 F5.3 mag e_5.8mag ? Uncertainty in 5.8mag 110-115 F6.3 mag 8.0mag ? Spitzer/IRAC 8.0 micron band magnitude 117-121 F5.3 mag e_8.0mag ? Uncertainty in 8.0mag
Byte-by-byte Description of file: table[89].dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequence number (<[PMF2008] NNN> in Simbad) 5- 8 I4 --- COUP ? The COUP identification number 10- 14 F5.2 [cm-2] logNH Log of the HI column density 16- 19 F4.2 [cm-2] e_logNH Uncertainty in logNH 21- 25 F5.2 keV kT1 First model plasma temperature 27- 31 F5.2 keV e_kT1 Uncertainty in kT1 33- 37 F5.2 [cm-3] logEM1 Log of first model emission measure 39- 42 F4.2 [cm-3] e_logEM1 Uncertainty in log EM1 44- 48 F5.2 keV kT2 ? Second model plasma temperature 50- 54 F5.2 keV e_kT2 ? Uncertainty in kT2 56- 60 F5.2 [cm-3] logEM2 ? Log of second model emission measure 62- 65 F4.2 [cm-3] e_logEM2 ? Uncertainty in log EM2 67- 71 F5.2 [10-7W] logLhc Log of hard 2-8keV luminosity (1) 73- 77 F5.2 [10-7W] logLtc Log of total 0.5-8keV luminosity (1)
Note (1): Absorption corrected and in units of erg/s.
Byte-by-byte Description of file: table14.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Sequence number (<[PMF2008] NNN> in Simbad) 4- 7 A4 --- Class YSO 0-I class (a or b) 9- 12 I4 --- COUP ? The COUP identification number (<COUP NNNNa> in Simbad) 14- 21 A8 --- LMH00 Lada et al., 2000AJ....120.3162L identification (<TPSC NN> in Simbad) 22- 25 I4 --- MLLA02 ? Muench et al., 2002, Cat. J/ApJ/573/366 identification (<MLLA NNNNA> in Simbad) 27- 28 I2 --- SBS04 ? Smith et al., 2004ApJ...610L.117S identification (<SBSMH NN> in Simbad) 30- 36 A7 --- SBS04n Smith et al., 2004ApJ...610L.117S name 38- 39 I2 --- SBS05 ? Smith et al., 2005, Cat. J/AJ/130/1763 identification 41- 46 A6 --- RBP05 Robberto et al., 2005, Cat. J/AJ/129/1534 identification (<MAX NNN> in Simbad)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 15-Sep-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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