The Angular Diameter and Fundamental Parameters of Sirius A
J. Davis A , M. J. Ireland B , J. R. North B , J. G. Robertson B C , W. J. Tango B and P. G. Tuthill BA Deceased. Formerly of Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
B Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
C Corresponding author. Email: Gordon.Robertson@sydney.edu.au
Publications of the Astronomical Society of Australia 28(1) 58-65 https://doi.org/10.1071/AS10010
Submitted: 23 April 2010 Accepted: 8 October 2010 Published: 5 January 2011
Abstract
The Sydney University Stellar Interferometer (SUSI) has been used to make a new determination of the angular diameter of Sirius A. The observations were made at an effective wavelength of 694.1 nm and the new value for the limb-darkened angular diameter is 6.048 ± 0.040 mas (±0.66%). This new result is compared with previous measurements and is found to be in excellent agreement with a conventionally calibrated measurement made with the European Southern Observatory’s Very Large Telescope Interferometer (VLTI) at 2.176 μm (but not with a second globally calibrated VLTI measurement). A weighted mean of the SUSI and first VLTI results gives the limb-darkened angular diameter of Sirius A as 6.041 ± 0.017 mas (±0.28%). Combination with the Hipparcos parallax gives the radius equal to 1.713 ± 0.009 R⊙. The bolometric flux has been determined from published photometry and spectrophotometry and, combined with the angular diameter, yields the emergent flux at the stellar surface equal to (5.32 ± 0.14) × 108 W m–2 and the effective temperature equal to 9845 ± 64 K. The luminosity is 24.7 ± 0.7 L⊙.
Keywords: stars: individual (α CMa, HR 2491) — stars: distances — techniques: interferometric
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