Spectroscopic and Interferometric Measurements of Nine K Giant Stars

TL;DR

This study combines spectroscopic and interferometric data to accurately determine fundamental parameters of nine K giant stars, improving mass estimates for stellar oscillation research.

Contribution

It provides precise measurements of stellar parameters for nine K giants, enhancing the accuracy of stellar mass determinations through combined interferometric and spectroscopic analysis.

Findings

No systematic offsets between interferometric and spectroscopic diameters.

Interferometric temperatures are generally hotter than spectroscopic ones by about 380 K.

Results will improve stellar mass estimates in oscillation studies.

Abstract

We present spectroscopic and interferometric measurements for a sample of nine K giant stars. These targets are of particular interest because they are slated for stellar oscillation observations. Our improved parameters will directly translate into reduced errors in the final masses for these stars when interferometric radii and asteroseismic densities are combined. Here we determine each star's limb-darkened angular diameter, physical radius, luminosity, bolometric flux, effective temperature, surface gravity, metallicity, and mass. When we compare our interferometric and spectroscopic results, we find no systematic offsets in the diameters and the values generally agree within the errors. Our interferometric temperatures for seven of the nine stars are hotter than those determined from spectroscopy with an average difference of about 380 K.