Scaling of Observable Properties in Rapidly Rotating Stars

TL;DR

This paper investigates how the observable properties like temperature and luminosity of rapidly rotating stars depend on inclination, using 2D models and spectral energy distributions, revealing scaling relations across a specific stellar mass range.

Contribution

It demonstrates that deduced effective temperature and luminosity scale with surface shape in rotating stars, extending previous findings to a broader mass range.

Findings

Deduced temperature and luminosity depend on inclination.

Surface property scaling applies to a 1.875-3.0 solar mass range.

Spectral energy distribution modeling informs inclination effects.

Abstract

The spectral energy distribution as a function of inclination is computed using 2D rotating stellar models and NLTE plane parallel stellar atmospheres. These models cover the range from $1.875M_{\odot}$ to $3.0M_{\odot}$. The deduced effective temperature is determined by B-V computed from the spectral energy distribution, and the deduced luminosity is computed as the integral of the spectral energy distribution over all frequencies, assuming the distance and reddening are known. These deduced quantities are obtained from the observed spectral energy distribution assuming the objects are spherically symmetric, and thus the results are dependent on the inclination. Previous work has shown that the surface properties between two rotating stellar models with the same surface shape scale, and this is also true for the deduced effective temperature and luminosity over this limited mass range.