Access to Astronomical Catalogues

← Click to display the menu
J/A+A/430/287       XMM observations of IC 2391 stars        (Marino+, 2005)

X-ray spectral and timing characteristics of the stars in the young open cluster IC 2391. Marino A., Micela G., Peres G., Pillitteri I., Sciortino S. <Astron. Astrophys., 430, 287-301 (2005)> =2005A&A...430..287M
ADC_Keywords: Clusters, open ; X-ray sources ; Photometry Keywords: X-ray: stars - stars: coronae - stars: activity - stars: early-type - stars: late-type - Galaxy: open clusters and associations: individual: IC 2391 Abstract: We present X-ray spectral and timing analysis of members of the young open cluster IC 2391 observed with the XMM-Newton observatory. We detected 99 X-ray sources by analysing the summed data obtained from MOS1, MOS2 and pn detectors of the EPIC camera; 24 of them are members, or probable members, of the cluster. Stars of all spectral types have been detected, from the early-types to the late-M dwarfs. Description: We present the analysis of the Guaranteed Time XMM-Newton/EPIC observation pointed on the young open cluster IC 2391. The observation (Obs. No. 0112420101), centered on (RA=8:42:00, DE=-53:00:36), was performed on Nov. 20, 2001 during orbit 357 of XMM-Newton. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 99 XMM-Newton sources in the IC 2391 region, as detected in the combined EPIC image. table2.dat 87 42 X-ray and optical properties of IC 2391 members, and upper limits in the combined EPIC image.
See also: B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2002) IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003) J/MNRAS/355/959 : Proper motions of IC 2391 possible members (Dodd+, 2004) J/ApJS/134/103 : Low-mass members of IC 2391 (Barrado y Navascues+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [MMP2005] Sequential number 4- 13 A10 --- VRX/CTIO VRX number or (CTIO) number (1) 16- 17 I2 h RAh Right ascension (J2000.0) 19- 20 I2 min RAm Right ascension (J2000.0) 22- 27 F6.3 s RAs Right ascension (J2000.0) 29 A1 --- DE- Declination sign (J2000.0) 30- 31 I2 deg DEd Declination (J2000.0) 33- 34 I2 arcmin DEm Declination (J2000.0) 36- 40 F5.2 arcsec DEs Declination (J2000.0) 42- 47 F6.2 ks Exp Exposure time (2) 50- 55 F6.2 ct/ks CR Count Rate (2) 57- 61 F5.2 ct/ks e_CR rms uncertainty on CR (2) 63- 68 F6.2 --- Signi Probability level for the source to be a background fluctuation expressed in terms of a Gaussian-σ-equivalent. 70- 74 F5.2 --- HR ? Hardness ratio, (H-S)/(H+S) (3) 76- 79 F4.2 --- e_HR ? rms uncertainty on HR
Note (1): VXR, Patten & Simon, 1996ApJS..106..489P, VXR PSPC NN in Simbad. CTIO, Barrado y Navascues et al., 1999ApJ...522L..53B and 2001ApJS..134..103B, Cl* IC 2391 CTIO NNN in Simbad. Note (2): Exposure time and X-ray count rates are expressed in "MOS1 equivalent" units. Note (3): Hardness ratio, (H-S)/(H+S), where H and S are the counts in the hard (0.8-3.5keV) and soft (0.3-0.8keV) bands, respectively.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Name (1) 9 A1 --- n_Name [ab] Note on Name (2) 11- 12 A2 --- Flag [?* #] Flag (3) 14- 15 I2 --- [MMP2005] ? Source number 17- 18 I2 h RAh Right ascension (J2000.0) 20- 21 I2 min RAm Right ascension (J2000.0) 23- 28 F6.3 s RAs Right ascension (J2000.0) 30 A1 --- DE- Declination sign (J2000.0) 31- 32 I2 deg DEd Declination (J2000.0) 34- 35 I2 arcmin DEm Declination (J2000.0) 37- 41 F5.2 arcsec DEs Declination (J2000.0) 43- 47 F5.2 mag Vmag V or I magnitude 48 A1 --- n_Vmag [I] I: I magnitude in Vmag 50- 54 F5.2 mag B-V ? B-V colour index 56- 59 F4.2 mag R-I ? R-I colour index 61- 64 F4.2 mag V-I ? V-I colour index 66 A1 --- l_CR Limit flag on CR 67- 72 F6.2 ct/ks CR Count rate 74- 75 A2 --- l_K-S [< ≥] Limit flag on K-S 76- 77 I2 % K-S ? Kolmogorov-Smirnov test results (4) 78 A1 --- --- [-] 79- 80 I2 --- K-Su ? Upper limit of K-S interval (4) 82 A1 --- l_logLX Limit flag on logLX 83- 87 F5.2 [10-7W] logLX X-ray luminosity
Note (1): Names are from: VXR : Patten & Simon, 1996ApJS..106..489P, VXR PSPC NN in Simbad. CTIO : Barrado y Navascues et al., 1999ApJ...522L..53B and 2001ApJS..134..103B, Cl* IC 2391 CTIO NNN in Simbad. L : Lynga, 1959ArA.....2..379L Cl* IC 2391 L NN in Simbad H : Hogg, 1960PASP...72...85H, Cl* IC 2391 H NN in Simbad SHJM : Stauffer et al., 1989ApJ...342..285S Cl* IC 2391 SHJM NN in Simbad Note (2): Note as follows: a = These stars have R-I inconsistent with cluster membership (see Fig. 6) b = Stars having (J-K), J values incompatible with the cluster main sequence. Note (3): Flags as follows: * = members for which spectral and timing analysis has been done using the EPIC/pn camera ? = suspected cluster member # = observed only by MOS1 and MOS2 Note (4): The Kolmogorov-Smirnov test is an confidence level of variability. variable : K-S>99%, marginally variable : K-S between 90% and 99% not variable : K-S <90%
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Mar-2006
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