The Emergent Flux and Effective Temperature of δ Canis Majoris

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Contents Vol 24(3)

doi:10.1071/AS07017

The Emergent Flux and Effective Temperature of δ Canis Majoris

J. Davis ^A ^D, A. J. Booth ^B, M. J. Ireland ^C, A. P. Jacob ^A, J. R. North ^A, S. M. Owens ^A, J. G. Robertson ^A, W. J. Tango ^A, P. G. Tuthill ^A

^A School of Physics, University of Sydney, Sydney NSW 2006, Australia
^B Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
^C Planetary Science, MS 150-21, Caltech, 1200 E. California Blvd, Pasadena, CA 91125, USA
^D Corresponding author. Email: j.davis@physics.usyd.edu.au





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Publications of the Astronomical Society of Australia 24(3) 151–158 http://dx.doi.org/10.1071/AS07017
Submitted: 17 May 2007 Accepted: 10 September 2007 Published online: 25 October 2007

Abstract

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 T _eff = 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.

Keywords: stars: atmospheres—stars: fundamental parameters—stars: individual (δ CMa)—techniques: interferometric