The Eclipsing Binaries from the LAMOST Medium-resolution Survey.III. A High-precision Empirical Stellar Mass Library

TL;DR

This paper presents a high-precision empirical stellar mass library based on 184 binaries, including new data from LAMOST, to improve calibration of stellar models across various spectral types and metallicities.

Contribution

It provides a comprehensive catalog of binaries with accurate masses and radii, including new LAMOST data, enhancing the diversity and precision of the stellar mass library.

Findings

The catalog contains 184 binaries with <5% uncertainties in mass and radius.

The new data increase the metallicity range and include 9 hot stars with Teff>8000 K.

Comparison shows typical mass estimate uncertainties >10%, radius >15%.

Abstract

High-precision stellar mass and radius measured directly from binaries can effectively calibrate the stellar models. However, such a database containing full spectral types and large range of metallicity is still not fully established. A continuous effort of data collecting and analysis are requested to complete the database. In this work, we provide a catalog containing 184 binaries with independent atmospheric parameters and accurate masses and radii as the benchmark of stellar mass and radius. The catalog contains 56 new detached binaries from LAMOST Medium-resolution spectroscopic (MRS) survey and 128 detached eclipsing binaries compiled from previous studies. We obtain the orbital solutions of the new detached binaries with uncertainties of masses and radii smaller than 5%. These new samples densify the distribution of metallicity of the high-precision stellar mass library and add 9 hot stars with Teff>8000 K. Comparisons show that these samples well agree with the PARSEC isochrones in Teff-logg-mass-radius-luminosity space. We compare mass and radius estimates from isochrone and SED fitting, respectively, with those from the binary orbital solution. We find that the precision of the stellar-model dependent mass estimates is >10% and the precision of the radius estimates based on atmospheric parameters is >15%. These give a general view of the uncertainty of the usual approaches to estimate stellar mass and radius.