J/A+A/635/A155 Gaia-ESO Survey SB1 catalogue (Merle+, 2020)
The Gaia-ESO Survey:
detection and characterisation of single-line spectroscopic binaries.
Merle T., Van der Swaelmen M., Van Eck S., Jorissen A., Jackson R.J.,
Traven G., Zwitter T., Pourbaix D., Klutsch A., Sacco G., Blomme R.,
Masseron T., Gilmore G., Randich S., Badenes C., Bayo A., Bensby T.,
Bergemann M., Biazzo K., Damiani F., Feuillet D., Frasca A., Gonneau A.,
Jeffries R.D., Jofre P., Morbidelli L., Mowlavi N., Pancino E.,
Prisinzano L.
<Astron. Astrophys. 635, A155 (2020)>
=2020A&A...635A.155M 2020A&A...635A.155M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: binaries: spectroscopic - techniques: radial velocities -
methods: data analysis - methods: statistical
Abstract:
Recent and on-going large ground-based multi-object spectroscopic
surveys allow to significantly increase the sample of spectroscopic
binaries to get insight into their statistical properties. We
investigate the repeated spectral observations of the Gaia-ESO Survey
(GES) internal data release 5 to identify and characterize
spectroscopic binaries with one visible component (SB1) in fields
covering the discs, the bulge, the CoRot fields, and stellar clusters
and associations. A statistical chi2-test is performed on spectra of
the iDR5 sub-sample of approximately 43500 stars characterized by at
least 2 observations and a S/N>3. Our sample of RV variables is
cleaned from contamination by pulsation/convection-induced variables
using Gaia DR2 parallaxes and photometry. Monte-Carlo simulations
using the SB9 catalogue of spectroscopic orbits allow to estimate our
detection efficiency and to correct the SB1 rate to evaluate the GES
SB1 binary fraction and its dependence with effective temperature and
metallicity. We find 641 (resp., 803) FGK SB1 candidates at the 5
sigma (resp., 3 sigma) level. The orbital-period distribution is
estimated from the RV standard-deviation distribution and reveals that
the detected SB1 probe binaries with log(P[d]) < 4. We estimate the
global GES SB1 fraction to be in the range 7-14% with a typical
uncertainty of 4%. The GES SB1 frequency decreases with metallicity at
a rate of -9±3%/dex in the metallicity range -2.7<FeH<+0.6. This
anticorrelation is obtained with a confidence level higher than 93% on
a homogeneous sample covering spectral types FGK and a large range of
metallicities. When the present-day mass function is accounted for,
this rate turns to 4±2%/dex with a confidence level higher than 88%.
In addition we provide the variation of the SB1 fraction with
metallicity separately for F, G, and K spectral types, as well as for
dwarf and giant primaries.
Description:
List of SB1 candidates with the parameters for the statistical
chi2-test, the intrinsic RV and photometric dispersion, as well as the
recommended GES atmospheric parameters.Time series will be available
in the companion paper by Van der Swaelmen et al. (in prep.).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 139 641 Catalogue of SB1 candidates with a confidence
level at 5 sigma (set 1)
table4.dat 139 162 Extension of SB1 candidates with a confidence
level at 3 that makes set 2 along with table 3
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See also:
J/A+A/608/A95 : GES: multi-line spectroscopic binary candidates (Merle+, 2017)
Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- GES GES name (HHMMSSss+DDMMSSs, J2000)
18- 29 A12 --- Field GES field name (1)
31- 35 F5.2 mag Vmag ? Visual apparent magnitude
37- 41 A5 --- Type 'dwarf' or 'giant' according the luminosity
criterion based on Gaia DR2 (see Eq. 13)
46- 50 F5.1 km/s dv-max Difference between the highest and the
lowest RV values
52- 60 F9.3 d dt-max Time difference corresponding to dv_max
64- 69 F6.1 km/s vmean Mean of the N RV series
73- 76 F4.1 km/s vstd Standard deviation of the N RV series
78- 79 I2 --- NRV Number of measured RVs
81- 87 F7.3 --- F2 F2 statistics, related to the chi2-test and
the degree of freedom number as given
by Eq. 9
91- 94 F4.1 km/s sigmav Intrinsic RV dispersion as defined by Eq. 10
100-104 F5.3 mag sigmaG Intrinsic G band dispersion as given
by Eq. 12
106-109 I4 K Teff ? GES recommended effective temperature
111-113 I3 K e_Teff ? GES recommended error on effective
temperature
118-121 F4.2 [cm/s2] logg ? GES recommended surface gravity
123-126 F4.2 [cm/s2] e_logg ? GES recommended error on surface gravity
130-134 F5.2 [Sun] [Fe/H] ? GES recommended metallicity
136-139 F4.2 [Sun] e_[Fe/H] ? GES recommended error on metallicity
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Note (1): membership assessement in those fields are not endorsed by the GES.
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Acknowledgements:
Thibault Merle, tmerle(at)ulb.ac.be
(End) Thibault Merle [ULB, Belgium], Patricia Vannier [CDS] 15-Mar-2020