XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J0440.9+4431 N. La Palombara, L. Sidoli, P. Esposito, A. Tiengo and S. Mereghetti A&A, 539 (2012) A82 Published online: 27 February 2012 DOI: 10.1051/0004-6361/201118221