First Results from the CHARA Array. I. An Interferometric and Spectroscopic Study of the Fast Rotator α Leonis (Regulus)

@article{Mcalister2005FirstRF,
  title={First Results from the CHARA Array. I. An Interferometric and Spectroscopic Study of the Fast Rotator $\alpha$ Leonis (Regulus)},
  author={H. Mcalister and T. Brummelaar and D. Gies and W. Huang and W. Bagnuolo and Jr. and M. Shure and J. Sturmann and L. Sturmann and N. Turner and S. Taylor and D. Berger and E. Baines and E. Grundstrom and C. Ogden and S. Ridgway and G. Belle},
  journal={The Astrophysical Journal},
  year={2005},
  volume={628},
  pages={439-452}
}
We report on K-band interferometric observations of the bright, rapidly rotating star Regulus (type B7 V) made with the CHARA Array on Mount Wilson, California. Through a combination of interferometric and spectroscopic measurements, we have determined for Regulus the equatorial and polar diameters and temperatures, the rotational velocity and period, the inclination and position angle of the spin axis, and the gravity darkening coefficient. These first results from the CHARA Array provide the… Expand
First Results from the CHARA Array. VII. Long-Baseline Interferometric Measurements of Vega Consistent with a Pole-On, Rapidly Rotating Star
We have obtained high-precision interferometric measurements of Vega with the CHARA Array and FLUOR beam combiner in the K’ band at projected baselines between 103m and 273m. The measured visibilityExpand
COLDER AND HOTTER: INTERFEROMETRIC IMAGING OF β CASSIOPEIAE AND α LEONIS
Near-infrared interferometers have recently imaged a number of rapidly rotating A-type stars, finding levels of gravity darkening inconsistent with theoretical expectations. Here, we present newExpand
INNER ORBITS IN HIERARCHICAL TRIPLE SYSTEMS FROM THE CHARA ARRAY. I. V819 Her B
We employ the wide component of a triple system to calibrate the interferometric visibility of the inner, short-period orbit in the case of V819 Her. The orbit for V819 Her B was thereby derived byExpand
First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars
We have measured the angular diameters of six M dwarfs with the CHARA Array, a long-baseline optical interferometer located at Mount Wilson Observatory. Spectral types range from M1.0 V to M3.0 VandExpand
First Results from the CHARA Array. V. Binary Star Astrometry: The Case of 12 Persei
We have obtained high-resolution orbital data with the CHARA Array for the bright star 12 Persei, a resolved double-lined spectroscopic binary. We describe the data reduction process, which can giveExpand
FUNDAMENTAL PARAMETERS OF THE EXOPLANET HOST K GIANT STAR ι DRACONIS FROM THE CHARA ARRAY
We measured the angular diameter of the exoplanet host star ι Dra with Georgia State University's Center for High Angular Resolution Astronomy Array interferometer and, using the star's parallax andExpand
ANGULAR DIAMETERS OF THE HYADES GIANTS MEASURED WITH THE CHARA ARRAY
We present angular diameters of the Hyades giants, γ, δ1, , and θ1 Tau from interferometric measurements with the CHARA Array. Our errors in the limb-darkened angular diameters for these stars areExpand
A Spectroscopic Orbit for Regulus
We present a radial velocity study of the rapidly rotating B star Regulus that indicates the star is a single-lined spectroscopic binary. The orbital period (40.11 days) and probable semimajor axisExpand
THE VISUAL ORBIT OF THE 1.1 DAY SPECTROSCOPIC BINARY σ2CORONAE BOREALIS FROM INTERFEROMETRY AT THE CHARA ARRAY
We present an updated spectroscopic orbit and a new visual orbit for the double-lined spectroscopic binary σ2 Coronae Borealis (CrB) based on radial velocity measurements at the Oak Ridge ObservatoryExpand
Imaging rapid rotators with the PAVO beam combiner at CHARA
Rotation plays a crucial role in the shaping and evolution of a star. Widely incorporated into early and late-stage stellar models, rotational effects remain poorly understood in main-sequence stars,Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 61 REFERENCES
V AND I IN ROTATING STARS FROM COPERNICUS UV DATA.
Results are presented for line-width measurements made on visual spectra and Copernicus scans over the wavelength range from 1000 to 1300 A of twenty high-rotation, low-rotation, and referenceExpand
The spinning-top Be star Achernar from VLTI-VINCI
We report here the first observations of a rapidly rotating Be star, Eridani, using Earth-rotation synthesis on the Very Large Telescope (VLT) Interferometer. Our measures correspond to a 2a=2b= 1:56Expand
First Results from the CHARA Array. II. A Description of the Instrument
The CHARA Array is a six 1 m telescope optical/IR interferometric array located on Mount Wilson, California, designed and built by the Center for High Angular Resolution Astronomy of Georgia StateExpand
Altair’s Oblateness and Rotation Velocity from Long-Baseline Interferometry
We present infrared interferometric angular size measurements for the A7IV-V star Altair that indicate a noncircular projected disk brightness distribution. Given the known rapid rotation of thisExpand
Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.
We have embarked on a project, under the aegis of the Nearby Stars (NStars)/Space Interferometry Mission Preparatory Science Program, to obtain spectra, spectral types, and, where feasible, basicExpand
Modelling rapid rotators for stellar interferometry
Optical long baseline interferometry is a powerful tool to study detailed stellar structures. In particular, rapid rotation induces interferometric signatures requiring a detailed modelling forExpand
Infrared beam combination at the CHARA Array
The CHARA Array consists of six 1-meter telescopes. The telescopes are at fixed positions laid out in a Y-shaped pattern, where the longest available baseline is 330 meters. The resolving power ofExpand
H. cap alpha. variations in the spectra of the brighter, northern Be stars
Photoelectric scans of H..cap alpha.. in the spectra of 35 bright Be stars accessible from Flagstaff, Arizona, were obtained during five observing periods in 1975--1977 with the Perkins 72 inch (1.8Expand
Studies on stellar rotation - III. An improvement of the treatment of the brightening distribution of rotating and tidally distorted stars
We have computed new values of the gravity-darkening exponents β 1 (GDE) incorporating the interior-atmosphere coupling by combining our method developed previously and the properties of modernExpand
An Improved, "Newtonian" Version of the Ebert-Fastie Spectrograph
ABSTRACT A new variation of the off‐plane Ebert‐Fastie spectrograph is described in which a Newtonian folding arrangement is mounted between the collimator/camera mirror and the grating. ThisExpand
...
1
2
3
4
5
...