The Emergent Flux and Effective Temperature of Delta Canis Majoris

TL;DR

This paper refines the measurements of Delta Canis Majoris's flux and temperature using new angular diameter data, leading to more accurate stellar parameters and comparisons with previous methods.

Contribution

The study provides improved estimates of the star's bolometric flux and effective temperature using new angular diameter measurements, enhancing accuracy over prior determinations.

Findings

Effective temperature Teff = 5818 ± 53 K.

Bolometric flux F = (6.50 ± 0.24) x 10^7 W/m^2.

Accuracy limited by bolometric flux uncertainty.

Abstract

New angular diameter determinations for the bright southern F8 supergiant Delta 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 plus/minus 0.24) x 10^7 W/m^2 and the effective temperature Teff = 5818 plus/minus 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.