Thirty-Three New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble

TL;DR

This paper reports 33 new stellar angular diameters measured with the NPOI, achieving high precision, and compares these measurements with other methods to validate and analyze stellar properties across different spectral types.

Contribution

The study provides a significant set of new stellar diameters with high accuracy and compares them with existing measurements, enhancing the reliability of stellar parameter determinations.

Findings

33 new stellar diameters with ≤2% uncertainty

Comparison shows consistency between NPOI measurements and other methods

Analysis covers a range of stellar types from mid-A to mid-K

Abstract

We present new angular diameter measurements for 33 stars from the Navy Precision Optical Interferometer, reaching uncertainties on the limb-darkened diameter of 2% or less for 21 targets. We also determined the physical radius, bolometric flux, luminosity, and effective temperature for each star. Our sample is a mix of giant, subgiant, and dwarf stars, and span spectral classes from mid-A to to mid-K. We combined these 33 stars with samples from previous publications to analyze how the NPOI diameters compare to those obtained using other means, namely (V-K) color, the JMMC Stellar Diameters Catalog, and Gaia predictions.