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Context: Multiple stellar systems play a fundamental role in the formation and evolution of stellar populations in galaxies. Recent and ongoing large groundbased multiobject spectroscopic surveys significantly increase the sample of spectroscopic binaries (SBs) allowing analyses of their statistical properties. Aims: We investigate the repeated spectral observations of the GaiaESO Survey internal data release 5 (GES iDR5) to identify and characterise SBs with one visible component (SB1s) in fields covering mainly the discs, the bulge, the CoRot fields, and some stellar clusters and associations. Methods: A statistical X2test is performed on spectra of the iDR5 subsample of approximately 43 500 stars characterised by at least two observations and a signaltonoise ratio larger than three. In the GES iDR5, most stars have four observations generally split into two epochs. A careful estimation of the radial velocity (RV) uncertainties is performed. Our sample of RV variables is cleaned from contamination by pulsation and/or convectioninduced variables using Gaia DR2 parallaxes and photometry. MonteCarlo simulations using the SB9 catalogue of spectroscopic orbits allow to estimate our detection effciency and to correct the SB1 rate to evaluate the GES SB1 binary fraction and its relation to effective temperature and metallicity. Result: We find 641 (resp., 803) FGK SB1 candidates at the 5σ (resp., 3σ) level. The maximum RV differences range from 2.2 km s1 at the 5σ confidence level (1.6 km s1 at 3σ) to 133 km s1 (in both cases). Among them a quarter of the primaries are giant stars and can be located as far as 10 kpc. The orbitalperiod distribution is estimated from the RV standarddeviation distribution and reveals that the detected SB1s probe binaries with log P[d] / 4. We show that SB1s with dwarf primaries tend to have shorter orbital periods than SB1s with giant primaries. This is consistent with binary interactions removing shorter period systems as the primary ascends the red giant branch. For two systems, tentative orbital solutions with periods of 4 and 6 d are provided. After correcting for detection efficiency, selection biases, and the presentday mass function, we estimate the global GES SB1 fraction to be in the range 714% with a typical uncertainty of 4%. A small increase of the SB1 frequency is observed from K towards Ftype stars, in agreement with previous studies. The GES SB1 frequency decreases with metallicity at a rate of (9 ± 3)% dex1 in the metallicity range 2:7 ≤ [Fe=H] ≤ +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 presentday mass function is accounted for, this rate turns to (4 ± 2)% dex1 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.
Originalspråk  engelska 

Artikelnummer  A155 
Tidskrift  Astronomy and Astrophysics 
Volym  635 
DOI  
Status  Published  2020 mars 27 
Ämnesklassifikation (UKÄ)
 Astronomi, astrofysik och kosmologi
Fingeravtryck
Utforska forskningsämnen för ”The Gaia ESO Survey: Detection and characterisation of singleline spectroscopic binaries”. Tillsammans bildar de ett unikt fingeravtryck.Projekt
 1 Avslutade

GaiaESO Survey
Gilmore, G., Randich, S., Feltzing, S., Bensby, T., Howes, L., Gruyters, P., Ryde, N., Stonkute, E. & Ruchti, G.
2012/12/24 → 2022/07/01
Projekt: Forskning