Access to Astronomical Catalogues

← Click to display the menu
J/A+A/530/A150   XMM obervations of λ Ori cluster    (Franciosini+, 2011)

XMM-Newton observations of the young open cluster around λ Orionis. Franciosini E., Sacco G.G. <Astron. Astrophys., 530, A150 (2011)> =2011A&A...530A.150F
ADC_Keywords: Clusters, open ; X-ray sources ; Photometry, UBVRI ; Photometry, infrared Keywords: open clusters and associations: individual: lambda Orionis - stars: activity - stars: coronae - stars: late-type - stars: pre-main sequence - X-rays: stars Abstract: We studied the X-ray properties of the young (∼1-8Myr) open cluster around the hot (O8 III) star λ Ori and compared them with those of the similarly-aged sigma Ori cluster to investigate possible effects of the different ambient environment. We analysed an XMM-Newton observation of the cluster using EPIC imaging and low-resolution spectral data. We studied the variability of detected sources, and performed a spectral analysis of the brightest sources in the field using multi-temperature models. Description: The λ Ori cluster was observed by XMM-Newton from 20:46 UT on September 28, 2006 to 12:23 UT on September 29, 2006 (Obs. ID 0402050101), for a total duration of 56ks, using both the EPIC MOS and PN cameras and the RGS instruments. The EPIC cameras were operated in full frame mode with the thick filter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 101 169 X-ray sources detected in the λ Ori cluster table1.dat 98 58 X-ray and optical properties of sources identified with known cluster members and candidates table2.dat 78 24 X-ray sources identified with possible new cluster candidates tablea2.dat 122 78 3σ upper limits and optical properties of undetected cluster members and candidates
See also: J/AJ/118/2409 : VRI photometry of lambda Ori PMS stars (Dolan+, 1999) J/AJ/123/387 : VRI photometry of lambda Ori star-forming region (Dolan+ 2002) J/ApJ/610/1064 : lambda Ori substellar population (Barrado y Navascues+ 2004) J/ApJ/664/481 : Collinder 69 optical/IR photometry (Barrado y Navascues+ 2007) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- LOX Sequential number 5- 6 I2 h RAh X-ray right ascension (J2000) 8- 9 I2 min RAm X-ray right ascension (J2000) 11- 15 F5.2 s RAs X-ray right ascension (J2000) 17 A1 --- DE- X-ray declination sign (J2000) 18- 19 I2 deg DEd X-ray declination (J2000) 21- 22 I2 arcmin DEm X-ray declination (J2000) 24- 27 F4.1 arcsec DEs X-ray declination (J2000) 29- 33 F5.2 arcmin Offaxis Offaxis 35- 39 F5.1 --- Signi Detection significance 41- 46 F6.2 ct/ks CRate MOS-equivalent count rates in the 0.3-7.8keV band 48- 51 F4.2 ct/ks e_CRate rms uncertainty on CRate 53- 75 A23 --- Ident Cross-dentification (G1) 76 A1 --- n_Ident [e] Binarity (2) 78- 81 F4.2 arcsec Offset ? Offset between X-ray source and optical identification 83-101 A19 --- Memb Notes about membership (3)
Note (2): This star has a fainter visual companion (2MASS J05340664+1001034, J=13.10mag) at a distance of ∼5-arcsec, which however falls outside our identification radius (offset=4.2-arcsec). Note (3): Membership status: Member = previously known members and candidates NM = previously known non-members. Reason for membership exclusion in parenthesis. New? = possible new member candidate
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- LOX Sequential number 5- 27 A23 --- Ident Identification (G1) 29- 33 F5.2 [10-7W] logLX X-ray luminosity in the 0.3-8keV band 34 A1 --- n_logLX [*] * when derived from spectral fits 36- 40 F5.2 [-] logX/b X-ray-to-bolometric luminosity ratio 42- 46 F5.2 mag Vmag ?=- V magnitude 48- 52 F5.2 mag Rmag ?=- R magnitude 54- 58 F5.2 mag Imag ?=- I magnitude 60- 64 F5.2 mag Jmag ?=- J magnitude 66- 70 F5.2 mag Hmag ?=- H magnitude 72- 76 F5.2 mag Ksmag ?=- Ks magnitude 78- 82 F5.2 Msun Mass ?=- Mass 84- 88 A5 --- SpType MK spectral type 90- 96 A7 --- Disc Disc classification (G2) 98 A1 --- Mm [s] Membership code (G3)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- LOX Sequential number 5- 21 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs) 23- 27 F5.2 mag Vmag ?=- V magnitude (1) 29- 33 F5.2 mag Rmag ?=- R magnitude (1) 34 A1 --- n_Rmag [*] Note on Rmag (1) 36- 40 F5.2 mag Imag ?=- I magnitude (1) 41 A1 --- n_Imag [*] Note on Imag (1) 43- 47 F5.2 mag Jmag ?=- J magnitude 49- 53 F5.2 mag Hmag ?=- H magnitude 55- 59 F5.2 mag Ksmag ?=- Ks magnitude 61- 65 F5.2 [10-7W] logLX X-ray luminosity in the 0.3-7.8keV band assuming d=400pc 66 A1 --- n_logLX [*] * when derived from spectral fits 67 A1 --- f_logLX [d] d when X-ray luminosity has been equally divided between the two stars (see text) 69- 73 F5.2 [-] logX/b X-ray-to-bolometric luminosity ratio (2) 75- 78 F4.2 Msun Mass ?=- Estimated mass (2)
Note (1): Optical photometry from Dolan & Mathieu (2002, Cat. J/AJ/123/387), except for the values marked with an asterisk that are photographic magnitudes from the USNO-B1.0 or GSC2.3 catalogues. Note (2): For stars with optical photometry, Lbol and masses were derived from the optical colours; for the others, they were computed from the J or Ks magnitudes for an age of 5Myr.
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Ident Identification (G1) 25- 26 I2 h RAh Right ascension (J2000) 28- 29 I2 min RAm Right ascension (J2000) 31- 35 F5.2 s RAs Right ascension (J2000) 37 A1 --- DE- Declination sign (J2000) 38- 39 I2 deg DEd Declination (J2000) 41- 42 I2 arcmin DEm Declination (J2000) 44- 47 F4.1 arcsec DEs Declination (J2000) 49 A1 --- l_CRate Limit flag on CRate 50- 54 F5.2 ct/ks CRate MOS-equivalent count rates in the 0.3-7.8keV band upper limit (1) 56 A1 --- l_logLX Limit flag on logLX 57- 61 F5.2 [10-7W] logLX X-ray luminosity in the 0.3-8keV band (upper limit) 63 A1 --- l_logX/b Limit flag on logX/b 64- 68 F5.2 [-] logX/b X-ray-to-bolometric luminosity ratio (upper limit) 70- 74 F5.2 mag Vmag ?=- V magnitude 76- 80 F5.2 mag Rmag ?=- R magnitude 82- 86 F5.2 mag Imag ?=- I magnitude 88- 92 F5.2 mag Jmag ?=- J magnitude 94- 98 F5.2 mag Hmag ?=- H magnitude 100-104 F5.2 mag Ksmag ?=- Ks magnitude 106-109 F4.2 Msun Mass ?=- Mass 111-115 A5 --- SpType MK spectral type 117-120 A4 --- Disc Disc classification (G2) 122 A1 --- Mm [s] Membership code (G3)
Note (1): Upper limits higher than 2ct/ks are overestimated due to close bright sources.
Global notes: Note (G1): Remarks about the identifications: * Identifications labelled DM refer to Dolan & Mathieu (1999, Cat. J/AJ/118/2409, <[DM99] NN> in Simbad), * Identifications labelled LOri refer to Barrado y Navascues et al. (2004, Cat. J/ApJ/610/1064, <LOri-CFHT NNN> in Simbad), * Identifications labelled Lori-SOC refer to Bouy et al. (2009A&A...504..199B, <LOri-SOC NN> in Simbad) * In table1.dat and tablea1.dat, 2MASS J05340691+1001005 (LOX 1) and J05351974+0947476 (LOX 99) are stars X2 and X4 from Stone & Taam (1985ApJ...291..183S). * In table1.dat and tablea1.dat, the two stars with a TYC identification are stars b and f in Murdin & Penston (1977MNRAS.181..657M). * In tablea2.dat, the GSC and 2MASS identifications correspond to the stars labelled c, d, e, g, and Ton 72 in Murdin & Penston (1977MNRAS.181..657M), respectively. Note (G2): Disc classification from Barrado y Navascues et al. (2007, Cat. J/ApJ/664/481) and Hernandez et al. (2009ApJ...707..705H); for class II or EV (stars with disk) we also indicate whether there is spectroscopic evidence for accretion (a) or not (n). Note (G3): An "s" in this column indicates spectroscopically-confirmed members (i.e. objects with spectroscopic youth features and radial velocity consistent with membership).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Sep-2011
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