J/A+A/620/A89 X-ray catalog of Galactic O stars (Nebot Gomez-Moran+, 2018)
The X-ray catalog of spectroscopically identified Galactic O stars.
Investigating the dependence of X-ray luminosity on stellar and wind parameters.
Nebot Gomez-Moran A., Oskinova L.M.
<Astron. Astrophys. 620, A89 (2018)>
=2018A&A...620A..89N 2018A&A...620A..89N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, O ; X-ray sources ; Stars, distances
Keywords: stars: massive - X-ray: stars
Abstract:
The X-ray emission of O-type stars was first discovered in the early
days of the Einstein satellite. Since then many different surveys have
confirmed that the ratio of X-ray to bolometric luminosity in O-type
stars is roughly constant, but there is a paucity of studies that
account for detailed information on spectral and wind properties of
O-stars. Recently a significant sample of O stars within our Galaxy
was spectroscopically identified and presented in the Galactic O-Star
Spectroscopic Survey (GOSS). At the same time, a large high-fidelity
catalog of X-ray sources detected by the XMM-Newton X-ray telescope
was released. Here we present the X-ray catalog of O stars with known
spectral types and investigate the dependence of their X-ray
properties on spectral type as well as stellar and wind parameters.We
find that, among the GOSS sample, 127 O-stars have a unique XMM-Newton
source counterpart and a Gaia data release 2 (DR2) association.
Terminal velocities are known for a subsample of 35 of these stars.We
confirm that the X-ray luminosities of dwarf and giant O stars
correlate with their bolometric luminosity. For the subsample of O
stars with measure terminal velocities we find that the X-ray
luminosities of dwarf and giant O stars also correlate with wind
parameters. However, we find that these correlations break down for
supergiant stars. Moreover, we show that supergiant stars are
systematically harder in X-rays compared to giant and dwarf O-type
stars. We find that the X-ray luminosity depends on spectral type, but
seems to be independent of whether the stars are single or in a binary
system. Finally, we show that the distribution of log(LX/Lbol) in our
sample stars is non-Gaussian, with the peak of the distribution at
log(LX/Lbol)~=-6.6.
Description:
The spectroscopic sample of Galactic O stars, GOSS (Cat. III/274, Sota
et al. 2014ApJS..211...10S 2014ApJS..211...10S; Maiz Apellaniz et al.
2016ApJS..224....4M 2016ApJS..224....4M), was used to investigate, in a homogeneous and
consistent way, the X-ray emission from O stars. We found that 127
stars from GOSS have an unambiguous counterpart in the 3XMM-DR7
catalog of X-ray sources and are associated to a Gaia-DR2 source.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 461 127 GOSXMM catalog
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
IX/50 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR6 (XMM-SSC, 2016)
III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- GOS GOS name (LLL.ll+BB.bb_ii, ii: index,
in Simbad) (gos)
18- 41 A24 --- Name Alternative name (name)
44- 64 A21 --- XMM 3XMM-DR7 name (3XMM JHHMMSS.s+DDMMSS)
(xmm_name)
66- 84 I19 --- GaiaDR2 Gaia source identifier, identical to the
Gaia-DR2 source_id (GaiaDR2sourceid)
87- 88 I2 h RAh Right ascension (J2000) (RAH)
90- 91 I2 min RAm Right ascension (J2000) (RAM)
93- 98 F6.3 s RAs Right ascension (J2000) (RAS)
101 A1 --- DE- Declination sign (J2000) (DEC-)
102-103 I2 deg DEd Declination (J2000) (DECD)
105-106 I2 arcmin DEm Declination (J2000) (DECM)
108-112 F5.2 arcsec DEs Declination (J2000) (DECS)
114-119 F6.3 mag VMAG Absolute V magnitude (Mv) (1)
121-126 F6.3 mag e_VMAG Absolute V magnitude error (e_Mv)
128-134 F7.3 mag Mbol Bolometric magnitude (Mbol) (1)
136-141 F6.3 mag e_Mbol Bolometric magnitude error (e_Mbol)
143-147 I5 K Teff Effective temperature (Teff) (1)
149-152 I4 K e_Teff [2000] Effective temperature error (e_Teff)
154-157 F4.2 [cm/s2] logg Effective gravity (logg) (1)
159-162 F4.2 [cm/s2] e_logg Erro in logg (e_logg)
164-169 F6.4 [10-7W] logLbol Bolometric luminosity in erg/s
(logLbolLsun_S)
171-175 I5 km/s Vinf ?=-1 Terminal velocity (Vinf) (2)
177-184 F8.5 [Msun/yr] logdM/dtV Theoretical mass loss rate
(logMassrate_vink) (3)
186-193 F8.5 [Msun/yr] logdM/dt Estimated mass loss rate in this paper
(logMassrate)
195-203 F9.3 kpc DistG Estimated distance distance_Gaia
(distance_Gaia) (4)
205-212 F8.3 kpc b_DistG Lower bound on the confidence interval of
the estimated distance (mindistanceGaia)
214-222 F9.3 kpc B_DistG Upper bound on the confidence interval of
the estimated distance (maxdistanceGaia)
224-231 F8.3 kpc DistMV Spectrophotometric distance
(distance_Mv)
233-240 F8.3 kpc e_DistMV Error in the spectrophotometric distance
(errordistanceMv)
242-247 F6.3 mag Bmag B magnitude (Bmag)
249-253 F5.3 mag e_Bmag Error in the B magnitude (e_Bmag)
255-260 F6.3 mag Vmag V magnitude (Vmag)
262-266 F5.3 mag e_Vmag Error in the V magnitude (e_Vmag)
268-272 F5.3 mag E(B-V) Color excess (EB_V)
274-278 F5.3 mag e_E(B-V) Error in the color excess (eEBV)
280-284 F5.3 mag AV Extinction in the V band (Av)
286-290 F5.3 mag e_AV Error in the extinction in the V band
(e_Av)
292-303 E12.6 cm-2 NH Hydrogen column density (Nh)
305-312 F8.5 ct/s PNCT Mean count rate in the 0.2-12keV band
(PNcountrate)
314-320 F7.5 ct/s e_PNCT Error in the mean count rate in the
0.2-12keV band (errcountrate)
322-333 E12.6 mW/m2 FX Unabsorbed flux in the 0.2-12keV band
in erg/s/cm2 (fx)
335-346 E12.6 mW/m2 b_FX Minimum unabsorbed flux in the 0.2-12keV
band in erg/s/cm2 (fx_min)
348-359 E12.6 mW/m2 B_FX Maximum unabsorbed flux in the 0.2-12keV
band in erg/s/cm2 (fx_max)
361-366 F6.3 mW/m2 logFbol Bolometric flux in erg/s/cm2 (log_fbol)
368-372 F5.3 mW/m2 e_logFbol Error in the bolometric flux in erg/s/cm2
(elogfbol)
374-379 F6.3 --- logFX/fbol X-ray to bolometric flux in erg/s/cm2
(logfxfbol)
381-386 F6.3 --- b_logFX/fbol Minimum X-ray to bolometric flux
(minlogfx_fbol)
388-393 F6.3 --- B_logFX/fbol Maximum X-ray to bolometric flux
(maxlogfx_fbol)
395-400 F6.3 [10-7W] logLX X-ray luminosity in erg/s (log_Lx)
402-407 F6.3 [10-7W] b_logLX Minimum X-ray luminosity in erg/s
(minlogLx)
409-414 F6.3 [10-7W] B_logLX Maximum X-ray luminosity in erg/s
(maxlogLx)
416-421 F6.3 [10-7W] logLbolG Bolometric luminosity in erg/s
(logLbolGaia)
423-428 F6.3 [10-7W] b_logLbolG Minimum bolometric luminosity in erg/s
(minlogLbol_Gaia)
430-435 F6.3 [10-7W] B_logLbolG Maximum bolometric luminosity in erg/s
(maxlogLbol_Gaia)
437-442 F6.3 --- HR2 Hardness ratio HR2 (HR2)
444-448 F5.3 --- e_HR2 Error in HR2 (HR2_ERR)
450-455 F6.3 --- HR3 ? Hardness ratio HR3 (HR3)
457-461 F5.3 --- e_HR3 ? Error in HR3 (HR3_ERR)
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Note (1): from Martins et al. (2005A&A...436.1049M 2005A&A...436.1049M).
Note (2): from Prinja et al. (1990ApJ...361..607P 1990ApJ...361..607P.)
Note (3): from the Vink et al. (2000A&A...362..295V 2000A&A...362..295V) recipe.
Note (4): From Bailer-Jones et al., 2018AJ....156...58B 2018AJ....156...58B, Cat. I/347.
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Acknowledgements:
Ada Nebot Gomez-Moran, ada.nebot(at)astro.unistra.fr
(End) Ada Nebot Gomez-Moran [ObAS], Patricia Vannier [CDS] 11-Oct-2018