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Using the Navy Precision Optical Interferometer, we measured the angular diameters of 10 stars that have previously measured solar-like oscillations. Our sample covered a range of evolutionary stages but focused on evolved subgiant and…

Solar and Stellar Astrophysics · Physics 2015-06-18 Ellyn K. Baines , J. Thomas Armstrong , Henrique R. Schmitt , James A. Benson , R. T. Zavala , Gerard T. van Belle

We measured the angular diameters of 44 stars with the Navy Precision Optical Interferometer, obtaining uncertainties on the limb darkened diameter of 2% or less for all but four stars. We then used our diameters with Gaia or Hipparcos…

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…

Solar and Stellar Astrophysics · Physics 2025-05-30 Ellyn K. Baines , James H. Clark , Henrique R. Schmitt , Jordan M. Stone , Kaspar von Braun

We have executed a survey of nearby, main sequence A, F, and G-type stars with the CHARA Array, successfully measuring the angular diameters of fortyfour stars with an average precision of ~ 1.5%. We present new measures of the bolometric…

Based on CHARA Array measurements, we present the angular diameters of 23 nearby, main- sequence stars, ranging from spectral type A7 to K0, five of which are exoplanet host stars. We derive linear radii, effective temperatures, and…

We present new or updated angular diameters, physical radii, and effective temperatures for 145 stars from the Navy Precision Optical Interferometer data archive. We used data from 1996 to late-2021, and we describe the differences between…

Solar and Stellar Astrophysics · Physics 2025-06-04 Ellyn K. Baines , James H. Clark , Bradley I. Kingsley , Henrique R. Schmitt , Jordan M. Stone

We present angular diameters for 42 luminosity class I stars and 32 luminosity class II stars that have been interferometrically determined with the Palomar Testbed Interferometer. Derived values of radius and effective temperature are…

Astrophysics · Physics 2015-05-13 G. T. van Belle , M. J. Creech-Eakman , A. Hart

Using Georgia State University's CHARA Array interferometer, we measured angular diameters for 25 giant stars, six of which host exoplanets. The combination of these measurements and Hipparcos parallaxes produce physical linear radii for…

We present interferometric angular sizes for 12 stars with known planetary companions, for comparison with 28 additional main-sequence stars not known to host planets. For all objects we estimate bolometric fluxes and reddenings through…

Solar and Stellar Astrophysics · Physics 2011-02-11 Gerard T. van Belle , Kaspar von Braun

While the search for exoplanets around main sequence stars more massive than the Sun have found relatively few such objects, surveys performed around giant stars have led to the discovery of more than 30 new exoplanets. The interest in…

Solar and Stellar Astrophysics · Physics 2015-06-03 F. Cusano , C. Paladini , A. Richichi , E. W. Guenther , B. Aringer , K. Biazzo , R. Molinaro , L. Pasquini , A. P. Hatzes

The number of stellar angular diameter measurements has greatly increased over the past few years due to innovations and developments in the field of long baseline optical interferometry (LBOI). We use a collection of high-precision angular…

Solar and Stellar Astrophysics · Physics 2015-06-17 Tabetha Boyajian , Gerard van Belle , Kaspar von Braun

We calculate directly determined values for effective temperature ($T_{\rm EFF}$) and radius ($R$) for 191 giant stars based upon high resolution angular size measurements from optical interferometry at the Palomar Testbed Interferometer.…

This paper presents a method to determine effective temperatures, angular semi-diameters and bolometric corrections for population I and II FGK type stars based on V and 2MASS IR photometry. Accurate calibration is accomplished by using a…

Astrophysics · Physics 2009-11-11 E. Masana , C. Jordi , I. Ribas

Benchmark stars with known angular diameters are key to calibrating interferometric observations. With the advent of optical interferometry, there is a need for suitably bright, well-vetted calibrator stars over a large portion of the sky.…

Solar and Stellar Astrophysics · Physics 2017-06-20 Samuel J. Swihart , E. Victor Garcia , Keivan G. Stassun , Gerard van Belle , Matthew W. Mutterspaugh , Nicholas Elias

The apparent size of stars is a crucial benchmark for fundamental stellar properties such as effective temperatures, radii and surface gravities. While interferometric measurements of stellar angular diameters are the most direct method to…

Solar and Stellar Astrophysics · Physics 2014-05-23 L. Casagrande , L. Portinari , I. S. Glass , D. Laney , V. Silva Aguirre , J. Datson , J. Andersen , B. Nordström , J. Holmberg , C. Flynn , M. Asplund

We present interferometric observations of six O-type stars that were made with the Precision Astronomical Visible Observations (PAVO) beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array. The observations include…

Solar and Stellar Astrophysics · Physics 2018-12-19 Kathryn D. Gordon , Douglas R. Gies , Gail H. Schaefer , Daniel Huber , Michael Ireland , D. John Hillier

We present bolometric fluxes and angular diameters for over 1.6 million stars in the {\it Tycho-2} catalog, determined using previously-determined empirical color-temperature and color-flux relations. We vet these relations via full fits to…

Solar and Stellar Astrophysics · Physics 2017-12-13 Daniel J. Stevens , Keivan G. Stassun , B. Scott Gaudi

PIONIER stands for Precision Integrated-Optics Near-infrared Imaging ExpeRiment. It combines four 1.8m Auxilliary Telescopes or four 8m Unit Telescopes of the Very Large Telescope Interferometer (ESO, Chile) using an integrated optics…

Thanks to their large angular dimension and brightness, red giants and supergiants are privileged targets for optical long-baseline interferometers. Sixteen red giants and supergiants have been observed with the VLTI/AMBER facility over a…

Solar and Stellar Astrophysics · Physics 2015-06-16 P. Cruzalèbes , A. Jorissen , Y. Rabbia , S. Sacuto , A. Chiavassa , E. Pasquato , B. Plez , K. Eriksson , A. Spang , O. Chesneau

We report on 13 new high-precision measurements of stellar diameters for low-mass dwarfs obtained by means of near-infrared long-baseline interferometry with PIONIER at the Very Large Telescope Interferometer. Together with accurate…

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