Is the additional increase of the star luminosity due to partial mixing real?

TL;DR

This paper investigates whether the observed increase in luminosity of early type B stars due to partial mixing between core and envelope is real, using high-quality binary star data to test the hypothesis.

Contribution

It provides evidence that the additional luminosity increase from partial mixing is consistent with observations when considering surface helium enrichment.

Findings

Additional luminosity increase does not contradict observed data.

Partial mixing intensity is constrained by surface helium content.

The hypothesis is supported by high-quality binary star measurements.

Abstract

The partial mixing of matter between the radiative envelope and the convective core in the early type B--star produces an additional increase of star luminosity during the main sequence evolution. The high quality data on stellar mass and luminosity defined from the studies of detached double-lined eclipsing binaries are used to check the existence of such additional increase. It is shown that the additional luminosity increase does not contradict to the observed data of high quality, if the intensity of partial mixing is restricted by the observed increase in surface helium content.