The YREC Stellar Evolution Code: Public Data Release

Abstract

In this paper we present the public release of the Yale Rotating Evolution Code (YREC). YREC is a stellar evolution code that covers brown dwarfs and stars across a wide range of masses, and evolutionary states from the pre-MS through helium burning. We summarize the key ingredients of the code, document the code performance, and discuss its strengths and limitations. We present libraries of input files, documentation, sample use cases, and scripts. In addition to usage as a research tool, we highlight the utility of the code for educational purposes.

Figures (22)

• Figure 1: A schematic illustration of the steps in the YREC code.
• Figure 2: The locus in the $\rho-T$ plane of 0.1(lower right), 0.3, 1, 3 and 9 $M_{\odot}$ models (upper left) at the zero-age main sequence, defined here as the point where the central hydrogen mass fraction is 0.005 lower than the birth value. These are solar metallicity models using the base model physics. The domains where radiation pressure equals gas pressure, and where zero-temperature degeneracy pressure equals gas pressure, are indicated by the respective red lines.
• Figure 3: Central temperature as a function of central density at ZAMS (black) and TAMS (red) locations. Comparisons are shown between YREC, MIST, and PARSEC evolution tracks for solar metallicity (YREC, $Z = 0.016492$; MIST, $Z = 0.0142$) and $Z = 0.017$ (PARSEC).
• Figure 4: Kippenhahn diagram showing the evolution of convective boundaries for the 1M$_\odot$ (top panel) and 3M$_\odot$ (bottom panel) models. Shaded gray regions indicate convective zones shown as a function of age and fractional mass coordinate.
• Figure 5: Radius as a function of mass for tracks 0.3 - 9.0 M$_\odot$ at ZAMS and TAMS. 2010Torres masses and radii of eclipsing binaries plotted for reference.