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 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 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:
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FileName Lrecl Records Explanations
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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 46 66 X-ray sources with no known counterpart within 5"
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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
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Bytes Format Units Label Explanations
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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)
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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 2004A&A...421..715S)
d = Source #4 in Paper I (Sanz-Forcada et al., 2004A&A...421..715S 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 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 2004A&A...421..715S).
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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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
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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.
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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 2001ApJ...556..830B, 1999ApJ...521..671B 1999ApJ...521..671B)
Caballero et al. (2004A&A...424..857C 2004A&A...424..857C)
Zapatero Osorio et al. (2002A&A...384..937Z 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)
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History:
From electronic version of the journal
References:
Sanz-Forcada et al., Paper I 2004A&A...421..715S 2004A&A...421..715S
(End) Patricia Vannier [CDS] 16-Nov-2006