# Isochrones of M67 with an Expanded Set of Parameters

## TL;DR

This paper generates detailed isochrones for the star cluster M67 using the Yale Rotating Stellar Evolution Code, exploring a wide range of parameters including metallicity, mixing length, helium abundance, convective overshoot, and diffusion.

## Contribution

It introduces a comprehensive set of isochrones with varied parameters, demonstrating the effects of diffusion and overshoot on fitting M67's properties.

## Key findings

- Age of M67 estimated between 3.6 and 4.8 Gyr.
- Distance to M67 estimated between 755 and 868 pc.
- Including diffusion allows fitting M67 without overshoot.

## Abstract

We create isochrones of M67 using the Yale Rotating Stellar Evolution Code. In addition to metallicity, parameters that are traditionally held fixed, such as the mixing length parameter and initial helium abundance, also vary. The amount of convective overshoot is also changed in different sets of isochrones. Models are constructed both with and without diffusion. From the resulting isochrones that fit the cluster, the age range is between 3.6 and 4.8 Gyr and the distance is between 755 and 868 pc. We also confirm Michaud et al. (2004) claim that M67 can be fit without overshoot if diffusion is included.