Change the star particles and include chemistry struct

src/stars/Eagle/stars_part.h

@@ -54,10 +54,10 @@ struct spart {
   /*! Star mass */
   float mass;
 
-  /* Initial star mass */
+  /*! Initial star mass */
   float mass_init;
 
-  /* Stellar age */ 
+  /*! Stellar age */
   float age;
 
   /* Particle cutoff radius. */
@@ -123,12 +123,6 @@ struct stars_props {
 
   /*! Maximal change of h over one time-step */
   float log_max_h_change;
-
-  /*! Fixed mass ratio Ca to Si */
-  float Ca_to_Si;
-
-  /*! Fixed mass ratio S to Si */
-  float S_to_Si;
 };
 
 #endif /* SWIFT_EAGLE_STAR_PART_H */