Access to Astronomical Catalogues

← Click to display the menu
J/A+A/455/903       ACIS-I observations of NGC 2264          (Flaccomio+, 2006)

ACIS-I observations of NGC 2264. Membership and X-ray properties of PMS stars. Flaccomio E., Micela G., Sciortino S. <Astron. Astrophys., 455, 903-921 (2006)> =2006A&A...455..903F
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; X-ray sources ; Photometry, infrared Keywords: stars: activity - stars: coronae - stars: pre-main sequence - open clusters and associations: individual: NGC 2264 - X-rays: stars Abstract: This paper's goal is to improve the member census of the NGC 2264 star-forming region and study the origin of X-ray activity in young PMS stars. We analyze a deep, 100ks long, Chandra ACIS observation covering a 17'x17' field in NGC 2264. The preferential detection in X-rays of low-mass PMS stars gives strong indications of their membership. We study X-ray activity as a function of stellar and circumstellar characteristics by correlating the X-ray luminosities, temperatures, and absorptions with optical and near-infrared data from the literature. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 420 Catalog of X-ray ACIS detections table3.dat 88 1598 Master catalog of objects in the ACIS FOV table4.dat 76 420 Optical/NIR properties of X-ray sources table6.dat 121 199 Spectral properties of ACIS sources with >50 counts
See also: J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999) J/A+A/355/651 : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000) J/AJ/123/1528 : UBV(RI)C and JHK photometry in NGC 2264 (Rebull+, 2002) J/A+A/417/557 : Rotation + variability of PMS Stars in NGC 2264 (Lamm, 2004) J/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004) J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004) J/A+A/430/1005 : VRIHα photometry of NGC 2264 variables (Lamm+, 2005) J/AJ/129/829 : Hα emission stars in NGC 2264 (Dahm+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ACIS [1/420] Sequential source number (G2) 5 I1 h RAh Right ascension (J2000) 7- 8 I2 min RAm Right ascension (J2000) 10- 13 F4.1 s RAs Right ascension (J2000) 15 A1 --- DE- Declination sign (J2000) 16 I1 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 24 F4.1 arcsec DEs Declination (J2000) 26- 29 F4.2 arcsec Rad Source radius 31- 34 F4.1 arcmin OffAxis Distance from the Chandra optical axis 36- 41 F6.1 ct Ct Source net counts in the 0.2-7keV band 43- 47 I5 s ExpTime Effective exposure time 49- 53 F5.1 --- Signi Significance of the detection 55- 59 F5.3 --- Var KS variability test probability 61- 64 F4.2 10+22cm-2 nH ?=- Hydrogen column density 66- 68 A3 ---- n_nH Source for nH (Av, JHK or X) 70- 73 A4 --- Mod Model used (G1) 75- 80 F6.2 mW/m2 FX(u) ?=- Observed X-ray flux
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq [1/1598] Sequential number (not [FMS2006b]) 5 A1 --- Mm [*] *: A likely NGC 2264 member 7 I1 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 15 F4.1 s RAs Right ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18 I1 deg DEd Declination (J2000) 20- 21 I2 arcmin DEm Declination (J2000) 23- 26 F4.1 arcsec DEs Declination (J2000) 28- 32 F5.2 arcsec Rad Radius 34- 36 I3 --- ACIS [1/420]?=- ACIS number (G2) 37 A1 --- f_ACIS [+] +: Entry also present in another row 42- 57 A16 --- 2MASS 2MASS designation 59- 62 I4 --- RMS ?=- Rebull et al., 2002, Cat. J/AJ/123/1528 number, Cl* NGC 2264 RMS NNNN in Simbad 63 A1 --- n_RMS [+] +: Entry also present in another row 64- 67 I4 --- LBM ?=- Lamm et al., 2004, Cat. J/A+A/417/557 number, Cl* NGC 2264 LBM NNNNN in Simbad 69- 71 I3 --- FMS ?=- Flaccomio et al., 2000, Cat. J/A+A/355/651 number, [FMS2000] XNNN in Simbad 72 A1 --- n_FMS [+] +: Entry also present in another row 74- 76 I3 --- W56 ?=- Walker 1956ApJS....2..365W number NGC 2264 NNN in Simbad 78- 80 I3 --- DS ?=- Dahm & Simon, 2005, Cat. J/AJ/129/829 number, Cl* NGC 2264 DS NNN in Simbad 83 A1 --- l_CR Limit flag on CR 84- 88 F5.1 10-4ct/s CR ?=- Count rate
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ACIS [1/420] Sequential number (G2) 5- 9 F5.2 mag Icmag ?=- Cousins I magnitude 11- 15 F5.2 mag R-Ic ?=- Cousins R-I colour index 17- 21 F5.2 mag Jmag ?=- J magnitude 23- 27 F5.2 mag Hmag ?=- H magnitude 29- 33 F5.2 mag Kmag ?=- K magnitude 35- 38 A4 --- SpType MK spectral type 40- 43 F4.2 mag Av ?=- Absorption 45- 49 F5.2 mag Av(JHK) ?=- Absorption from JHK 51- 54 F4.2 [K] logTeff ?=- Effective temperature 56- 60 F5.2 [solLum] logLbol ?=- Bolometric luminosity 62- 65 F4.2 solMass Mass ?=- Mass 67- 70 F4.2 [yr] logAge ?=- Age 72- 76 F5.2 d Prot ?=- Rotational period
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ACIS [1/420] Sequential number (G2) 5- 8 A4 --- Mod Adopted model (G1) 10 A1 --- n_Mod [abc] Note on Mod (1) 13- 15 A3 --- r_nH Source of the adopted nH (Av, JHK or X) 17- 20 F4.2 --- Pnull Null hypothesis probability 22- 25 F4.2 10+22cm-2 nH Adopted hydrogen column density 27- 30 F4.2 10+22cm-2 nHl ? Lower value of nH interval 32- 36 F5.2 10+22cm-2 nHu ? Upper value of nH interval 38- 42 F5.2 keV kT1 Model 1 plasma temperature 44- 48 F5.2 keV kT1l Lower value of kT1 interval 50- 54 F5.2 keV kT1u Upper value of kT1 interval 56- 60 F5.2 --- n1 Model 1 normalization 62- 66 F5.2 --- n1l ? Lower value of n1 interval 68- 72 F5.2 --- n1u Upper value of n1 interval 74- 78 F5.2 keV kT2 ?=- Model 2 plasma temperature 80- 83 F4.2 keV kT2l ? Lower value of kT2 interval 85- 89 F5.2 keV kT2u ? Upper value of kT2 interval 91- 95 F5.2 --- n2 ?=- Model 2 normalization 97-101 F5.2 --- n2l ? Lower value of n2 interval 103-107 F5.2 --- n2u ? Upper value of n2 interval 109-114 F6.2 [mW/m2] logFX(a) Absorption-corrected flux in [0.5-7]keV band 116-121 F6.2 [mW/m2] logFX(u) Observed flux in [0.5-7]keV band
Note (1): Note as follows: a = Abund.= 1.43{0.42}{5.00} b = Abund.= 0.84{0.50}{1.26} c = Abund.= 0.94{0.38}{2.69}
Global notes: Note (G1): Models are labelled as follows: 1T = one-temperature model with plasma abundances fixed at 0.3 times the solar abundances, NH fixed at values corresponding to the optically/NIR determined extinctions, when available: NH=1.6x1021AV 2T = two-temperature models with both Plasma abundances fixed at 0.3 times the solar abundances and treated as a free parameter NH fixed at values corresponding to the optically/NIR determined extinctions, when available: NH=1.6x1021AV 2Tab = two-temperature models with both free NH and free abundances Note (G2): The ACIS number is designated as [FMS2006b] in Simbad
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Feb-2007
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

catalogue service

© UDS/CNRS

Contact