The impact of GAIA astrometry on the evolutionary status of the seismic analog HD 42618

Abstract. Last year, the satellite Gaia from ESA released its first data in astrometry (Gaia DR1), including new parallax measurements of millions of stars. Among these results, we were interested in the new parallax measurement of the CoRoT target HD 42618. This parallax, which is 1.5 mas lower than the one measured by Hipparcos, therefore corresponds to a greater distance and consequently to a larger luminosity. This implies a change in its evolutionary status, that we have studied from spectroscopic data, seismic analysis from photometric CoRoT data, and stellar evolution models. We show that the Gaia astrometric measurements can have an impact on the estimated evolutionary status of a solar-type star and, in the case of HD 42618, it implies some disagreements with the seismic data.