J/A+A/536/A31 Cyg OB2 XMM observations (Rauw, 2011)
A multi-epoch XMM-Newton campaign on the core of the massive Cyg OB2
association.
Rauw G.
<Astron. Astrophys. 536, A31 (2011)>
=2011A&A...536A..31R 2011A&A...536A..31R
ADC_Keywords: Clusters, open ; Stars, early-type ; X-ray sources ; Ultraviolet
Keywords: open clusters and associations: individual: Cyg OB2 -
stars: early-type - stars: pre-main sequence -
stars: individual: Cyg OB2 12 - X-rays: stars
Abstract:
Cyg OB2 is one of the most massive associations of O-type stars in
our Galaxy. Despite the large interstellar reddening towards
Cyg OB2, many studies, spanning a wide range of wavelengths, have
been conducted to more clearly understand this association. X-ray
observations provide a powerful tool to overcome the effect of
interstellar absorption and study the most energetic processes
associated with the stars in Cyg OB2.
We analyse XMM-Newton data to investigate the X-ray and UV properties
of massive O-type stars as well as low-mass pre-main sequence stars in
Cyg OB2.
Description:
The general properties of the X-ray sources detected in Cyg OB2 with
the EPIC cameras onboard XMM-Newton are given in Table 2. In addition,
Table 4 provides the properties of the sources detected inside Cyg OB2
with two UV filters of the OM instrument onboard XMM-Newton.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 326 199 Properties of the X-ray sources in Cyg OB2
table4.dat 132 254 Properties of the UV sources in Cyg OB2
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See also:
J/AJ/101/1408 : Massive stars in Cyg OB2 (Massey+ 1991)
J/A+A/464/211 : Chandra and near-IR obs. of Cyg OB2 (Albacete Colombo+, 2007)
J/A+A/486/453 : NIR photometry of early-type stars in Cyg OB2 (Comeron+, 2008)
J/ApJ/664/1102 : Radial velocity survey of Cyg OB2 association (Kiminki+, 2007)
J/ApJS/184/84 : X-ray sources in Cyg OB2 region (Wright+, 2009)
J/A+A/495/231 : Multiwavelength study of Cyg OB2 5 (Linder+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- IDX [1/199] ID number of X-ray source
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 37 E10.5 ct/s pnCRS EPIC-pn count rate in soft band
42- 47 F6.4 --- pnPrS Probability that the source be constant in
EPIC-pn soft band
49 I1 --- pnNrS Number of observations in EPIC-pn soft band
51- 60 E10.5 ct/s pnCRM EPIC-pn count rate in medium band
65- 70 F6.4 --- pnPrM Probability that the source be constant in
EPIC-pn medium band
72 I1 --- pnNrM Number of observations in EPIC-pn medium band
74- 83 E10.5 ct/s pnCRH EPIC-pn count rate in hard band
88- 93 F6.4 --- pnPrH Probability that the source be constant in
EPIC-pn hard band
95 I1 --- pnNrH Number of observations in EPIC-pn hard band
97-106 E10.5 ct/s m1CRS EPIC-MOS1 count rate in soft band
111-116 F6.4 --- m1PrS Probability that the source be constant in
EPIC-MOS1 soft band
118 I1 --- m1NrS Number of observations in EPIC-MOS1 soft band
120-129 E10.5 ct/s m1CRM EPIC-MOS1 count rate in medium band
134-139 F6.4 --- m1PrM Probability that the source be constant in
EPIC-MOS1 medium band
141 I1 --- m1NrM Number of observations in EPIC-MOS1 medium band
143-152 E10.5 ct/s m1CRH EPIC-MOS1 count rate in hard band
157-162 F6.4 --- m1PrH Probability that the source be constant in
EPIC-MOS1 hard band
164 I1 --- m1NrH Number of observations in EPIC-MOS1 hard band
166-175 E10.5 ct/s m2CRS EPIC-MOS2 count rate in soft band
180-185 F6.4 --- m2PrS Probability that the source be constant in
EPIC-MOS2 soft band
187 I1 --- m2NrS Number of observations in EPIC-MOS2 soft band
189-198 E10.5 ct/s m2CRM EPIC-MOS2 count rate in medium band
203-208 F6.4 --- m2PrM Probability that the source be constant in
EPIC-MOS2 medium band
210 I1 --- m2NrM Number of observations in EPIC-MOS2 medium band
212-221 E10.5 ct/s m2CRH EPIC-MOS2 count rate in hard band
226-231 F6.4 --- m2PrH Probability that the source be constant in
EPIC-MOS2 hard band
233 I1 --- m2NrH Number of observations in EPIC-MOS2 hard band
235-240 F6.3 mag UVM2 ? Mean XMM-OT/UVM2 AB-magnitude of counterpart
242-247 F6.3 mag UVW1 ? Mean XMM-OT/UVW1 AB-magnitude of counterpart
249-251 I3 --- IDOM ? ID number of OM counterpart
253-258 F6.3 mag Jmag ? J magnitude of 2MASS counterpart
260-265 F6.3 mag Hmag ? H magnitude of 2MASS counterpart
267-272 F6.3 mag Ksmag ? Ks magnitude of 2MASS counterpart
274-276 A3 --- q2M Quality of the 2MASS counterpart (1)
278-282 F5.2 mag Vmag ? V magnitude of optical counterpart from
Massey & Thompson (1991, Cat. J/AJ/101/1408)
284-288 F5.2 mag U-B ? U-B colour of optical counterpart from
Massey & Thompson (1991, Cat. J/AJ/101/1408)
291-294 F4.2 mag B-V ? B-V colour of optical counterpart from
Massey & Thompson (1991, Cat. J/AJ/101/1408)
296-326 A31 --- Com Comments on spectral type and commonly used
designation of the source
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Note (1): For single 2MASS counterparts, the flag contains the 2MASS
quality flag; otherwise:
ncp = no 2MASS counterpart in the 4 arcsec correlation radius
2cp = two 2MASS counterparts in the 4 arcsec correlation radius
3cp = three 2MASS counterparts in the 4 arcsec correlation radius
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- IDOM [1/254] ID number of the OM source
5- 14 F10.6 deg RAdeg Right ascension (J2000)
16- 24 F9.6 deg DEdeg Declination (J2000)
27- 32 F6.3 mag UVM2 ? Mean XMM-OT/UVM2 (232nm) AB-magnitude
34- 40 F7.5 --- prM2 ? Probability that the source be constant in
UVM2 filter
43- 48 F6.3 mag UVW1 ? Mean XMM-OT/UVW1 (299nm) AB-magnitude
50- 56 F7.5 --- prW1 ? Probability that the source be constant in
UVW1 filter
58- 61 F4.2 arcsec rc1 ? Angular distance from likely optical
counterpart
63- 65 I3 --- MT91 ? ID number of the optical counterpart in
Massey & Thompson (1991, Cat. J/AJ/101/1408)
67- 71 F5.2 mag Vmag ? V magnitude of optical counterpart from
Massey & Thompson (1991, Cat. J/AJ/101/1408)
73- 76 F4.2 mag U-B ? U-B colour of optical counterpart from
Massey & Thompson (1991, Cat. J/AJ/101/1408)
78- 81 F4.2 mag B-V ? B-V colour of optical counterpart from
83- 86 F4.2 arcsec rc2 ? Angular distance from likely 2MASS
counterpart
88- 93 F6.3 mag Jmag ? J magnitude of 2MASS counterpart
95-100 F6.3 mag Hmag ? H magnitude of 2MASS counterpart
102-107 F6.3 mag Ksmag ? Ks magnitude of 2MASS counterpart
109-132 A24 --- Com Comments on spectral type and commonly used
designation of the source
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Acknowledgements:
Gregor Rauw, rauw(at)astro.ulg.ac.be
(End) Gregor Rauw [IAGL, Belgium], Patricia Vannier [CDS] 13-Oct-2011