2001MNRAS.326L..13O

We present BeppoSAX observations of Nova Velorum 1999 (V382 Vel), carried out in a broad X-ray band covering 0.1-300keV only 15d after the discovery(ref???[q4]) and again after 6 months. The nova was detected at day 15 with the BeppoSAX instruments which measured a flux F_x≃1.8x10^–11erg.cm^–2.s^–1 in the 0.1-10keV range and a 2σ upper limit F_x<6.7x10^–12erg.cm^–2.s^–1 in the 15-60keV range. We attribute the emission to shocked nebular ejecta at a plasma temperature kT≃6keV. At six months no bright component emerged in the 15-60keV range, but a bright central supersoft X-ray source appeared. The hot nebular component previously detected had cooled to a plasma temperature kT<1keV. There was strong intrinsic absorption of the ejecta in the first observation and not in the second, because the column density of neutral hydrogen decreased from N(H)≃1.7x10²³ to N(H)≃10²¹cm^–2 (close to the interstellar value). The unabsorbed X-ray flux also decreased from F_x=4.3x10^–11 to F_x≃10^–12erg.cm^–2.s^–1.