The spectroscopic multiplicity fraction in a sample of A/F-type (candidate) hybrid stars from the Kepler mission
By means of a study based on multi-epoch high-resolution spectra of 83 A--F-type candidate hybrid pulsating stars from the Kepler mission, collected at various observatories, we derive a (lower) estimate of the fraction of hybrid stars which belong to spectroscopic binary and multiple systems. In the first part of the study (49 hybrid stars) we derived a global spectroscopic multiplicity fraction of 27% (Lampens et al. 2018). In the second part we intend to obtain the same information for another 46 candidates. From a preliminary classification of 43 new targets, we are finding a spectroscopic multiplicity fraction of $\sim$30\%. Spectroscopic observations are on-going. As a bonus, we identified systems for which a combined analysis of time delays (TDs) with radial velocities (RVs) enable one to derive accurate orbital elements and mass ratios and also an identification of the pulsating component. Furthermore, we will analyse the low-frequency regions of the periodograms of these stars using the exquisite data collected by Kepler.
Stars and their Variability Observed from Space
- Pub Date:
- technique: spectroscopy;
- stars: spectroscopic systems;