Diameter and limb-darkening measures for Alpha Orionis

Details Diameter and limb-darkening measures for Alpha Orionis Diameter and limb-darkening measures for Alpha Orionis

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..737c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 737-744.

Astronomy and Astrophysics

Astrophysics

31

Diameters, Late Stars, Limb Darkening, Stellar Structure, Supergiant Stars, Interferometry, Power Spectra, Speckle Patterns, Stellar Models

Scientific paper

Previously reported speckle interferometric measurements of the angular diameter of Alpha Ori are widely scattered and apparently inconsistent. Stellar atmosphere models predict a stellar disk to be limb-darkened differently for different spectral features, and that less limb-darkening will be observed at longer wavelengths. Upon careful analysis of calibrated speckle observations obtained at various wavelengths with the KPNO 4 m telescope, a single diameter parameter is found to be inadequate to explain all of the features of the measurements. There is evidence for a central stellar component of 42.1(+ or - 1.1) mas diameter with extended structure surrounding it. Limb-darkening effects are suggested by attempts to fit cosine model image profiles to the data. These fits have significant residuals at large radii suggesting a faint envelope extending from 1 to 5 stellar radii.

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