Nils H. Turner

Eleven Exoplanet Host Star Angular Diameters from the CHARA Array (2009)

Baines, Ellyn K., McAlister, Harold A., Brummelaar, Theo A. Ten, Sturmann, J., Sturmann, L., Turner, Nils H., ...

We directly measured the angular diameters for 11 exoplanet host stars using Georgia State University's CHARA Array interferometer and calculated their linear radii and effective temperatures. The...

Angular Diameters of the Hyades Giants Measured with the CHARA Array (2008)

Boyajian, Tabetha S., McAlister, Harold A., Cantrell, Justin R., Gies, Douglas R., Brummelaar, Theo A. Ten, Farrington, Chris, ...

We present angular diameters of the Hyades giants, gamma, delta^1, epsilon, and theta^1 Tau from interferometric measurements with the CHARA Array. Our errors in the limb-darkened angular diameters...

The Visual Orbit of the 1.1-day Spectroscopic Binary \sigma^2 Coronae Borealis from Interferometry at the CHARA Array (2008)

Raghavan, Deepak, McAlister, Harold A., Torres, Guillermo, Latham, David W., Mason, Brian D., Boyajian, Tabetha S., ...

We present an updated spectroscopic orbit and a new visual orbit for the double-lined spectroscopic binary \sigma^2 Coronae Borealis based on radial velocity measurements at the Oak Ridge Observatory...

Adaptive Optics Photometry and Astrometry of Binary Stars. III. A Faint Companion Search of O-Star Systems (2008)

Turner, Nils H., Brummelaar, Theo A. Ten, Roberts Jr., Lewis C., Mason, Brian D., Hartkopf, William I., Gies, Douglas R.

We present the results of an adaptive optics survey for faint companions among Galactic O-type star systems (V < 8) using the Advanced Electro-Optical System (AEOS) 3.6-meter telescope on Haleakala....

Angular Diameters of the G Subdwarf $\mu$ Cassiopeiae A and the K Dwarfs $\sigma$ Draconis and HR 511 from Interferometric Measurements with the CHARA Array (2008)

Boyajian, Tabetha S., McAlister, Harold A., Baines, Ellyn K., Gies, Douglas R., Henry, Todd, Jao, Wei-Chun, ...

Using the longest baselines of the CHARA Array, we have measured the angular diameter of the G5 V subdwarf $\mu$ Cas A, the first such determination for a halo population star. We compare this result...

The Search for Stellar Companions to Exoplanet Host Stars Using the CHARA Array (2008)

Baines, Ellyn K., McAlister, Harold A., Brummelaar, Theo A. Ten, Turner, Nils H., Sturmann, Judit, Sturmann, Laszlo, ...

Most exoplanets have been discovered via radial velocity studies, which are inherently insensitive to orbital inclination. Interferometric observations will show evidence of a stellar companion if it...

CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars (2008)

Baines, Ellyn K., McAlister, Harold A., Brummelaar, Theo A. Ten, Turner, Nils H., Sturmann, Judit, Sturmann, Laszlo, ...

We have measured the angular diameters for a sample of 24 exoplanet host stars using Georgia State University's CHARA Array interferometer. We use these improved angular diameters together with...

Direct measurement of the radius and density of the transiting exoplanet HD 189733B with the Chara array (2007)

Baines, Ellyn K., Van Belle, Gerard T., Ten Brummelaar, Theo A., McAlister, Harold A., Swain, Mark, Turner, Nils H., ...

We have measured the angular diameter of the transiting extrasolar planet host star HD 189733 using the CHARA optical/IR interferometric array. Combining our new angular diameter of 0.377 +/- 0.024...

The projection factor of delta Cephei A calibration of the Baade-Wesselink method using the CHARA Array (2005)

Antoine, Mérand, Kervella, Pierre, Foresto, Vincent Coude Du, Ridgway, Stephen T., Aufdenberg, Jason P., Brummelaar, Theo A. Ten, ...

Cepheids play a key role in astronomy as standard candles for measuring intergalactic distances. Their distance is usually inferred from the Period-Luminosity relationship, calibrated using the...