HST/ACS observations of the old and metal-poor Sagittarius dwarf irregular galaxy Y. Momany, E. V. Held, I. Saviane, L. R. Bedin, M. Gullieuszik, M. Clemens, L. Rizzi, M. R. Rich and K. Kuijken A&A, 439 1 (2005) 111-127 Published online: 22 July 2005 DOI: 10.1051/0004-6361:20052747