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The Angular Diameter and Fundamental Parameters of Sirius A

Published online by Cambridge University Press:  02 January 2013

J. Davis ,
M. J. Ireland ,
J. R. North ,
J. G. Robertson ,
W. J. Tango  and
P. G. Tuthill
J. Davis
Affiliation:
Deceased. Formerly of Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
M. J. Ireland
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
J. R. North
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
J. G. Robertson*
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
W. J. Tango
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
P. G. Tuthill
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
*
CCorresponding author. Email: Gordon.Robertson@sydney.edu.au
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Abstract

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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: distancestechniques: interferometric
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 28 , Issue 1 , 2011 , pp. 58 - 65
Copyright
Copyright © Astronomical Society of Australia 2011

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