# Astro2020 Science White Paper: High Angular Resolution Astrophysics - Fundamental Stellar Parameters

## TL;DR

High angular resolution astrophysics, especially long-baseline optical interferometry, is crucial for accurately measuring fundamental stellar parameters, enabling comprehensive understanding of stars, their environments, and exoplanets.

## Contribution

This white paper highlights the advancements and importance of high angular resolution techniques, particularly interferometry, in empirically determining stellar parameters and characterizing stellar systems.

## Key findings

- Large survey samples improve empirical stellar parameter measurements.
- True imaging and parametric fitting are now routinely achievable.
- Enhanced resolution techniques enable detailed characterization of stars and exoplanets.

## Abstract

Direct determination of fundamental stellar parameters has many profound and wide-ranging impacts throughout astrophysics. These determinations are rooted in high angular resolution observations. In particular, as long-baseline optical interferometry has matured over the past decade, increasingly large survey samples are serving to empirically ground the basic parameters of these building blocks of the universe. True imaging and improved parametric fitting are becoming routinely available, an essential component of fully characterizing stars, stellar environments, and planets these stars may host.