WDEC - A code for modeling white dwarf structure and pulsations

TL;DR

WDEC is a Fortran-based, versatile, and fast code for modeling white dwarf stars and their pulsations, incorporating modern physics and used extensively in asteroseismic research since the 1960s.

Contribution

This paper provides a comprehensive overview of WDEC's history, physics, features, and updates, facilitating its use in white dwarf modeling and asteroseismology.

Findings

WDEC accurately models white dwarf evolution from hot to cooler states.

It can compute g-mode oscillation modes for white dwarf models.

The code has been extensively used in asteroseismic studies since the 1970s.

Abstract

The White Dwarf Evolution Code (WDEC), written in Fortran, makes models of white dwarf stars. It is fast, versatile, and includes the latest physics. The code evolves hot (~ 100,000 K) input models down to a chosen effective temperature by relaxing the models to be solutions of the equations of stellar structure. The code can also be used to obtain g-mode oscillation modes for the models. WDEC has a long history going back to the late 1960's. Over the years, it has been updated and re-packaged for modern computer architectures, and has specifically been used in computationally intensive asteroseismic fitting. Generations of white dwarf astronomers and dozens of publications have made use of the WDEC, although the last true instrument paper is the original one, published in 1975. This paper discusses the history of the code, necessary to understand why it works the way it does, details the physics and features in the code today, and points the reader to where to find the code and a user guide.