CHARA Commissioning Science Observations: The Diameter of λ Boötes

Details CHARA Commissioning Science Observations: The Diameter of λ Boötes CHARA Commissioning Science Observations: The Diameter of λ Boötes

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1420c&link_type=abstract

American Astronomical Society Meeting 206, #14.20; Bulletin of the American Astronomical Society, Vol. 37, p.456

Astronomy and Astrophysics

Astronomy

Scientific paper

We present commissioning science observations with the CHARA array of λ Boötes. We have used the longest baselines of the CHARA array to observe the prototype of this subclass of unevolved A stars. λ Boötes is a chemically peculiar A star, with near-solar abundances of light elements such as C, N, O, & S ([Fe/H] ≈ 0.0) and highly depleted abundances of heavy elements such as Mg, Ca, Fe, Ti, & Sr ([Fe/H] ≈ -2.0). Our observations of λ Boo demonstrate that the star has an effective temperature of 10,280 ± 960 K typical of early A-type stars, but a linear radius of only 1.49 ± 0.28 R{&sun;}. The star is 25% smaller than would be expected for an A0 star of solar metallicity, but the star is also 33% larger than would be expected for an A0 star of extremely low metallicity ([Fe/H] = -2.0). We discuss the implications of these unique observations performed with the CHARA array.

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