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

Harold A. McAlister | Zendy; Theo A. ten Brummelaar | Zendy; Douglas R. Gies | Zendy; W. Huang | Zendy; W. G. Bagnuolo | Zendy; M. A. Shure | Zendy; J. Sturmann | Zendy; L. Sturmann | Zendy; N. H. Turner | Zendy; Stuart F. Taylor | Zendy; David H. Berger | Zendy; Ellyn K. Baines | Zendy; Erika D. Grundstrom | Zendy; Chad Ogden | Zendy; Stephen T. Ridgway | Zendy; Gerald van Belle | Zendy

Open Access

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

Author(s) -

Harold A. McAlister,

Theo A. ten Brummelaar,

Douglas R. Gies,

W. Huang,

W. G. Bagnuolo,

M. A. Shure,

J. Sturmann,

L. Sturmann,

N. H. Turner,

Stuart F. Taylor,

David H. Berger,

Ellyn K. Baines,

Erika D. Grundstrom,

Chad Ogden,

Stephen T. Ridgway,

Gerald van Belle

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/430730

Subject(s) - interferometry , physics , position angle , astrophysics , polar , astronomy , optics , galaxy

We report on K-band interferometric observations of the bright, rapidlyrotating star Regulus (type B7 V) made with the CHARA Array on Mount Wilson,California. Through a combination of interferometric and spectroscopicmeasurements, we have determined for Regulus the equatorial and polar diametersand temperatures, the rotational velocity and period, the inclination andposition angle of the spin axis, and the gravity darkening coefficient. Thesefirst results from the CHARA Array provide the first interferometricmeasurement of gravity darkening in a rapidly rotating star and represent thefirst detection of gravity darkening in a star that is not a member of aneclipsing binary system.Comment: Accepted for publication in The Astrophysical Journal, 44 pages w/ 14 figure

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