J/A+A/446/501 XMM observations of sigma Ori cluster (Franciosini+, 2006)
XMM-Newton observations of the σ Orionis cluster. II. Spatial and spectral analysis of the full EPIC field. Franciosini E., Pallavicini R., Sanz-Forcada J. <Astron. Astrophys., 446, 501-513 (2006)> =2006A&A...446..501F
ADC_Keywords: Clusters, open ; X-ray sources ; Stars, pre-main sequence ; Photometry, infrared Keywords: open clusters and associations: individual: sigma Orionis - stars: activity - stars: coronae - stars: pre-main sequence - stars: late-type - X-rays: stars Abstract: We present the results of an XMM-Newton observation of the young (∼2-4Myr) cluster around the hot star sigma Orionis. In a previous paper (Sanz-Forcada et al., 2004A&A...421..715S) we presented the analysis of the RGS spectrum of the central hot star; here we discuss the results of the analysis of the full EPIC field. We have detected 175 X-ray sources, 88 of which have been identified with cluster members, including very low-mass stars down to the substellar limit. We detected eleven new possible candidate members from the 2MASS (Cat. II/246) catalogue. Description: XMM-Newton observations of the sigma Ori cluster, centered on the hot star sigma Ori AB, were carried out as part of the Guaranteed Time of one of us (R.P.) using both the EPIC MOS and PN cameras and the RGS instrument. The observation (ID 0101440301) started at 21:47 UT on March 23, 2002 and ended at 9:58 UT on March 24, 2002, for a total duration of 43ks. The EPIC cameras were operated in Full Frame mode using the thick filter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 101 90 X-ray sources with at least one cluster member or candidate within 5" tablea2.dat 80 106 3sigma upper limits for undetected late-type cluster members or candidates tableb.dat 101 66 X-ray sources with no known counterpart within 5"
See also: B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2002) IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003) J/A+A/419/249 : RJHKs photometry of sigma Ori low-mass stars (Scholz+, 2004) J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004) J/MNRAS/356/89 : sigma Ori low-mass stars (Kenyon+, 2005) J/MNRAS/356/1583 : sigma Ori low-mass candidate members RV (Burningham+, 2005) J/AN/325/705 : RIJHKs of low-mass stars in sigma Ori (Bejar+, 2004) Byte-by-byte Description of file: tablea1.dat tableb.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NX X-ray sources running identification number, [FPS2006] NX NNN in Simbad 4 A1 --- f_NX [*] Note on NX (1) 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 34 F5.1 --- Sign Significance of detection 36- 41 F6.2 ct/ks CR Count rate 43- 46 F4.2 ct/ks e_CR rms uncertainty on CR 48- 63 A16 --- OptID Optical ID (G1) 64 A1 --- n_OptID [cde] Note on OptID (2) 66- 69 F4.2 arcsec Dr ? Offset between X-ray and optical source 71- 75 F5.2 mag Imag ? I magnitude 77- 80 F4.2 mag R-I ? R-I colour index 82- 85 F4.2 mag I-J ? I-J colour index 87- 90 A4 --- SpType MK spectral type (3) 91 A1 --- r_SpType [*] *: spectral types from the literature 93- 97 F5.2 [Sun] logLX ? Unabsorbed X-ray luminosity in the 0.3-8keV band 98 A1 --- n_logLX [+] Note on X-ray luminosity (4) 100-101 A2 --- C/W Probable/possible CTTS or WTTS flag (G2)
Note (1): Sources NX = 59 and 130 have been detected on one MOS only Note (2): Flags as follows: c = Source #3 in Paper I (Sanz-Forcada et al., 2004A&A...421..715S) d = Source #4 in Paper I (Sanz-Forcada et al., 2004A&A...421..715S) e = Source detected on the PN only. The reported count rates are PN count rates. LX was derived using the conversion factor for PN (see Sect. 3.1). Note (3): Spectroscopically-determined spectral types from the literature are marked with an asterisk. The other spectral types have been estimated from the R-I, V-I or I-J colours using the relations by Kenyon & Hartmann (1995, Cat. J/ApJS101/117) and Leggett et al. (2001ApJ...548..908L). Note (4): Values marked with a "+" have been derived from the PN or MOS1 spectral fits reported in Table 3 and in Paper I (Sanz-Forcada et al. 2004A&A...421..715S).
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Name (G1) 18- 19 I2 h RAh Right ascension (J2000) 21- 22 I2 min RAm Right ascension (J2000) 24- 28 F5.2 s RAs Right ascension (J2000) 30 A1 --- DE- Declination sign (J2000) 31- 32 I2 deg DEd Declination (J2000) 34- 35 I2 arcmin DEm Declination (J2000) 37- 40 F4.1 arcsec DEs Declination (J2000) 42- 46 F5.2 mag Imag I magnitude 48- 51 F4.2 mag R-I ? R-I colour index 53- 56 F4.2 mag I-J ? I-J colour index 58- 61 A4 --- SpType MK spectral type 62 A1 --- r_SpType [*] *: spectral types from the literature 64- 65 A2 --- C/W Probable/possible CTTS or WTTS flag (G2) 67 A1 --- l_CR Limit flag on CR 68- 73 F6.2 ct/ks CR Count rate (2) 75 A1 --- l_logLX Limit flag on logLX 76- 80 F5.2 [Sun] logLX ? Unabsorbed X-ray luminosity in the 0.3-8keV band
Note (2): Upper limits higher than 10cts/ks are due to the presence of a very close bright X-ray source and are therefore overestimated.
Global notes: Note (G1): Optical identifications are from the following sources: -- 4772- 1 r05..., p05... = Wolk (1996, Ph.D. Thesis, Univ. New York at Stony Brook) -- rHHMMSS-DDMMa = [W96] rJHHMMSS+DDMMa in Simbad -- pHHMMSS-DDMMa = [W96] pJHHMMSS+DDMMa in Simbad -- 4771-NNNN = [W96] 4771-NNNN in Simbad -- SE NNN = Scholz & Eisloffel (2004, Cat. J/A+A/419/249) [SE2004] NNN in Simbad -- SWW NNN = Sherry et al. (2004, Cat. J/AJ/128/2316) where NNN is the "recno" of J/AJ/128/2316/table4 in VizieR -- S Ori, J05... = Bejar et al. (2004, Cat. J/AN/325/705, 2001ApJ...556..830B, 1999ApJ...521..671B) Caballero et al. (2004A&A...424..857C) Zapatero Osorio et al. (2002A&A...384..937Z): note that we have dropped the S Ori prefix in front of the J05... names S Ori J05... = [BMZ2001] S Ori J05... in Simbad S Ori NN = [BZR99] S Ori NN in Simbad -- K = Kenyon et al. (2005, Cat. J/MNRAS/356/89) [KJN2005] NN in simbad -- B = Burningham et al. (2005, Cat. J/MNRAS/356/1583) [BNL2005] F.FF NNNN in Simbad Note (G2): The flags are as follows: C = probable Classical T Tauri Stars (CTTS) C? = possible Classical T Tauri Stars (CTTS) W = probable Weak-lined T Tauri Stars (WTTS) W? = possible Weak-lined T Tauri Stars (WTTS)
History: From electronic version of the journal References: Sanz-Forcada et al., Paper I 2004A&A...421..715S
(End) Patricia Vannier [CDS] 16-Nov-2006
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