Astronomy & Astrophysics, 488, 3, pp. 1093-1100 Astronomy & Astrophysics, 488(3), 1093-1100. EDP Sciences Department of Physics and Astronomy Faculty Publications Astronomy & Astrophysics, 488, 1093-1100 Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2008, 488, pp.1093-1100. ⟨10.1051/0004-6361:200809634⟩ Astronomy and astrophysics 1093-1100 (2008). doi:10.1051/0004-6361:200809634 SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP Astronomy and Astrophysics, Vol. 488, No 3 (2008) pp. 1093-1100