1. Saint Mary’s University, Department of Astronomy and Physics and the Institute for Computational Astrophysics, 923 Robie Street, Halifax, Nova Scotia B3H 3C3, Canada
2. Laboratoire d’Astrophysique de Marseille, Université Aix-Marseille, 38 rue Frederic Joliot Curie, Marseille F-13388, France
3. Physics Department, Mount Allison University, 62 York Street, Sackville, New Brunswick E4L 1E2, Canada