# The Impact of Gaia DR1 on Asteroseismic Inferences from Kepler

## TL;DR

This paper assesses how Gaia DR1 parallaxes influence the accuracy of asteroseismic inferences for Kepler stars, showing that most stellar properties remain consistent, but some insights into stellar rotation are reinforced.

## Contribution

It introduces a comparison of asteroseismic stellar properties derived with and without Gaia DR1 parallaxes, highlighting the impact on mass and age estimates.

## Key findings

- Most stellar mass and age estimates are consistent with and without Gaia parallaxes.
- For some stars, Gaia data significantly refine stellar property estimates.
- Updated properties support previous findings on stellar rotation anomalies.

## Abstract

The Kepler mission has been fantastic for asteroseismology of solar-type stars, but the targets are typically quite distant. As a consequence, the reliability of asteroseismic modeling has been limited by the precision of additional constraints from high-resolution spectroscopy and parallax measurements. A precise luminosity is particularly useful to minimize potential biases due to the intrinsic correlation between stellar mass and initial helium abundance. We have applied the latest version of the Asteroseismic Modeling Portal (AMP) to the complete Kepler data sets for 30 stars with known rotation rates and chromospheric activity levels. We compare the stellar properties derived with and without the measured parallaxes from the first data release of Gaia. We find that in most cases the masses and ages inferred from asteroseismology shift within their uncertainties. For a few targets that show larger shifts, the updated stellar properties only strengthen previous conclusions about anomalous rotation in middle-aged stars.