Speaker
Dr
Giovanni Catanzaro
(INAF - Catania)
Description
The Kepler four-years space mission and its K2 extension provide photometric time series with unprecedented accuracy. Given the relevance of these data, the introduction of large databases, as homogeneous as possible, collecting important astrophysical parameters such as temperature, gravity and metallicity became necessary. The LAMOST-Kepler project, based on LAMOST spectroscopy of Kepler targets, aims at providing the atmospheric parameters and other basic data for thousands of stars, which fall in the field of view of the Kepler telescope.
In the framework of LAMOST-Kepler project, a recent paper by Frasca et al. (2016) focused on the determination of activity indicators, atmospheric parameters, radial and rotational velocities with the code ROTFIT for a sample of about 60000 stars in the Kepler field that were observed with LAMOST from 2011 to 2014. In that paper, a comparison with data from the literature for a few hundred targets allowed the authors to assess the accuracy of the parameters and to identify objects with discrepant values.
We know the importance of binary systems as benchmark for a lot of studies in astrophysics, for the determination of masses or as laboratory for evolutionary studies, just to quote some. From the sample of radial velocity by Frasca et al. (2016), two stars (KIC5219533 =HD226766; KIC7599132 = HD180757) have been extracted and observed more carefully with the CAOS spectrograph attached to the 0.91-m telescope at Serra La Nave (Sicily, Italy). The preliminary results of these studies are the subject of this talk.
Primary author
Dr
Giovanni Catanzaro
(INAF - Catania)
