J/A+A/477/593 X-ray properties of Carina OB1 association (Antokhin+, 2008)
X-ray study of early type stars in the Carina OB1 association
Antokhin I.I., Rauw G., Vreux J.-M., van der Hucht K.A., Brown J.C.
<Astron. Astrophys. 477, 593 (2008)>
=2008A&A...477..593A 2008A&A...477..593A
ADC_Keywords: Stars, early-type ; Stars, pre-main sequence ; X-ray sources
Keywords: stars: early-type - stars: binaries: general - X-rays: stars
Abstract:
X-ray properties of the stellar population in the Carina OB1
association are examined with special emphasis on early-type stars.
Their spectral characteristics provide some clues to understanding the
nature of X-ray formation mechanisms in the winds of single and binary
early-type stars. A timing and spectral analysis of five observations
with XMM-Newton is performed using various statistical tests and
thermal spectral models. 235 point sources have been detected within
the field of view. Several of these sources are probably pre-main
sequence stars with characteristic short-term variability. Seven
sources are possible background AGNs. Spectral analysis of twenty
three sources of type OB and WR 25 was performed. We derived spectral
parameters of the sources and their fluxes in three energy bands.
Estimating the interstellar absorption for every source and the
distance to the nebula, we derived X-ray luminosities of these stars
and compared them to their bolometric luminosities. We discuss
possible reasons for the fact that, on average, the observed X-ray
properties of binary and single early type stars are not very
different, and give several possible explanations.
Description:
X-ray catalogue of sources detected with XMM-Newton in the Carina OB1
association is presented. X-ray count rates in three energy bands and
the X-ray variability status are given. Cross-identifications of X-ray
sources with optical and infrared catalogues are also presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 319 557 X-ray detections
table3.dat 179 235 Cross identification table of X-ray sources
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See also:
J/A+AS/128/309 : ubvy-beta photometry of CarOB1 & CarOB2 stars (Kaltcheva 1998)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/235] Source number
8- 13 A6 --- Var Variability status of the source (1)
15- 19 A5 --- DataSet Data set number(s)
24- 31 F8.1 --- L2PN ? Logarithmic likelihood of the detection for
the EPIC PN instrument
34- 42 F9.4 mct/s crPN ? Total count rate in the whole PN energy band
(0.4-10.0 keV), in units of 0.001 counts/s
47- 53 F7.4 mct/s e_crPN ? rms uncertainty on crPN
57- 64 F8.4 mct/s crPNS ? Count rate in the soft PN energy band
(0.4-1.0keV)
69- 75 F7.4 mct/s e_crPNS ? rms uncertainty on crPNS
78- 86 F9.4 mct/s crPNM ? Count rate in the medium PN energy band
(1.0-2.5keV)
91- 97 F7.4 mct/s e_crPNM ? rms uncertainty on crPNM
100-108 F9.4 mct/s crPNH ? Count rate in the hard PN energy band
(2.5-10.0keV)
113-119 F7.4 mct/s e_crPNH ? rms uncertainty on crPNH
124-131 F8.1 --- L2MOS1 ? Logarithmic likelihood of the detection for
the EPIC MOS1 instrument
134-142 F9.4 ct/s crMOS1 ? Total count rate in the whole MOS1 energy
band (0.4-10.0keV)
147-153 F7.4 ct/s e_crMOS1 ? rms uncertainty on crMOS1
157-164 F8.4 ct/s crMOS1S ? Count rate in the soft MOS1 energy band
(0.4-1.0keV)
170-175 F6.4 ct/s e_crMOS1S ? rms uncertainty on crMOS1S
179-186 F8.4 ct/s crMOS1M ? Count rate in the medium MOS1 energy band
(1.0-2.5keV)
192-197 F6.4 ct/s e_crMOS1M ? rms uncertainty on crMOS1M
200-208 F9.4 ct/s crMOS1H ? Count rate in the hard MOS1 energy band
(2.5-10.0keV)
213-219 F7.4 ct/s e_crMOS1H ? rms uncertainty on crMOS1H
224-231 F8.1 --- L2MOS2 ? Logarithmic likelihood of the detection for
the EPIC MOS2 instrument
234-242 F9.4 ct/s crMOS2 ? Total count rate in the whole MOS2 energy
band (0.4-10.0keV)
247-253 F7.4 ct/s e_crMOS2 ? rms uncertainty on crMOS2
257-264 F8.4 ct/s crMOS2S ? Count rate in the soft MOS2 energy band
(0.4-1.0keV)
270-275 F6.4 ct/s e_crMOS2S ? rms uncertainty on crMOS2S
279-286 F8.4 ct/s crMOS2M ? Count rate in the medium MOS2 energy band
(1.0-2.5keV)
292-297 F6.4 ct/s e_crMOS2M ? rms uncertainty on crMOS2M
300-308 F9.4 ct/s crMOS2H ? Count rate in the hard MOS2 energy band
(2.5-10.0keV)
313-319 F7.4 ct/s e_crMOS2H ? rms uncertainty on crMOS2H
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Note (1): The variability status is one of:
Uncert = Uncertain variability status
Const = Non-variable source
Var = Variable source
Noinfo = Not sufficient data to perform the variability test
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/235] Source number
7- 21 A15 --- XMMUJ Source name according to the naming conventions
for serendipitous XMM-Newton sources
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 36 F5.2 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 51 F4.1 arcsec DEs Declination (J2000)
55- 57 A3 --- [AMM2003] ? Source number from Albacete-Colombo et al.
(2003MNRAS.346..704A 2003MNRAS.346..704A)
62- 64 I3 --- [ESK2003] ? Source number from Evans et al. (2003,
Cat. J/ApJ/589/509)
68 I1 --- N2MASS Number of 2MASS counterparts within 4.0" radius
71- 74 F4.2 arcsec Dist ? Angular separation between the X-ray
source and the infrared counterpart
76- 80 F5.2 mag Jmag ? J band magnitude from the 2MASS catalogue
83- 87 F5.2 mag Hmag ? H band magnitude from the 2MASS catalogue
90- 94 F5.2 mag Ksmag ? KS band magnitude from the 2MASS
catalogue
97-101 F5.2 mag Vmag ? V magnitude of the optical counterpart
104-107 F4.2 mag B-V ? B-V colour of the optical counterpart
111-115 F5.2 mag U-B ? U-B colour of the optical counterpart
119-144 A26 --- OptName Name of the optical counterpart (1)
147-162 A16 --- SpType MK Spectral type
171-175 A5 --- Ref Reference to various optical photometric
catalogues (2)
178-179 I2 % Mmb ? Membership probability from the proper
motion study of Cudworth et al. (1993,
Cat. J/AJ/105/1822)
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Note (1): Simbad nomenclature note:
Tr 16 NNN = Cl* Trumpler 16 NNN in Simbad
MJ NNN = Cl* Trumpler 16 MJ NNN in Simbad
DETCW-14 NNN = DETWC Tr 14 JHHMMSS.s-DDMMSS in Simbad
Note (2): References as follows:
Cud = Cudworth et al., 1993, Cat. J/AJ/105/1822
DETWC = Degioia-Esatwood et al., 2001, Cat. J/ApJ/549/578
MJ = Massey & Johnson, 1993, Cat. J/AJ/105/980
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Acknowledgements: Igor Antokhin, igor(at)sai.msu.ru
(End) I. Antokhin [Sternberg Astron. Inst. Russia], P. Vannier [CDS] 25-Oct-2007