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 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 1996ApJS..106..489P, VXR PSPC NN in Simbad.
CTIO, Barrado y Navascues et al., 1999ApJ...522L..53B 1999ApJ...522L..53B and
2001ApJS..134..103B 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 1996ApJS..106..489P, VXR PSPC NN in Simbad.
CTIO : Barrado y Navascues et al., 1999ApJ...522L..53B 1999ApJ...522L..53B and
2001ApJS..134..103B 2001ApJS..134..103B, Cl* IC 2391 CTIO NNN in Simbad.
L : Lynga, 1959ArA.....2..379L 1959ArA.....2..379L Cl* IC 2391 L NN in Simbad
H : Hogg, 1960PASP...72...85H 1960PASP...72...85H, Cl* IC 2391 H NN in Simbad
SHJM : Stauffer et al., 1989ApJ...342..285S 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