A tomographic study of the classical nova RR Pictoris

We present the results of spectrophotometric observations of the old nova RR Pictoris performed in two spectral ranges, one centered in the Ha line, and other covering H beta and H gamma spectral lines. From the Hb radial velocity study, we found a primary radial semiamplitude of K-1 = 37(1) km s(-1) and a systemic velocity of gamma = 1.8(2) km s(-1). With these new values, a mass diagram is constructed, constraining the possible mass intervals for the system. The possible orbital inclination range was restricted, given the fact that RR Pic presents shallow eclipses. A secondary mass range below the limit of a main-sequence star filling its Roche lobe indicates an evolved companion. We also calculated the H alpha, H beta, H gamma, He I lambda 6678, and He II lambda 4686 Doppler tomograms. The most conspicuous differences are found between the He I and He II tomograms; the former has a ring shape, while the second is filled at low velocities, suggesting that the low-velocity emission is not coming from the accretion disk. Radial emissivity profiles for these lines were also derived.