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The Emergent Flux and Effective Temperature of δ Canis Majoris

Published online by Cambridge University Press:  05 March 2013

J. Davis*
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
A. J. Booth
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
M. J. Ireland
Affiliation:
Planetary Science, MS 150-21, Caltech, 1200 E. California Blvd, Pasadena, CA 91125, USA
A. P. Jacob
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
J. R. North
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
S. M. Owens
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
J. G. Robertson
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
W. J. Tango
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
P. G. Tuthill
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia
*
DCorresponding author. Email: j.davis@physics.usyd.edu.au
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Abstract

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New angular diameter determinations for the bright southern F8 supergiant δ CMa enable the bolometric emergent flux and effective temperature of the star to be determined with improved accuracy. The spectral flux distribution and bolometric flux have been determined from published photometry and spectrophotometry and combined with the angular diameter to derive the bolometric emergent flux ℱ = (6.50 ± 0.24) × 107 Wm−2 and the effective temperature Teff = 5818 ± 53 K. The new value for the effective temperature is compared with previous interferometric and infrared flux method determinations. The accuracy of the effective temperature is now limited by the uncertainty in the bolometric flux rather than by the uncertainty in the angular diameter.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2007

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