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We present our observational results of the recurrent nova T Pyxidis at itsearly stage of 2011 outburst, using a low-resolution spectrograph($R\approx400$) attached to a 28cm telescope. Total nights of our observationare 11, among which 9 nights are during the pre-maximum stage. As a result wehave obtained a detailed evolutional feature of this recurrent nova on the wayto its maximum light. At first, on the earliest three nights ($-25 \sim -21$days before maximum), broad and prominent emission lines such as Balmer series,He I, He II, N II, N III and O I together with P Cygni profile are seen on thespectra. The blueshifted absorption minima of H$\alpha$ yields a maximumexpansion velocity of approximately 2200 km s$^{-1}$, and the velocitygradually decreases. Then, Helium and Nitrogen lines are weakened day by day.After that (18 days before maximum light), Fe II (multiplets) lines emerge onthe spectra. These lines are then strengthened day by day, and the P Cygniprofiles also become more prominent. Accordingly, the expansion velocitiesturns to be gradual increase. In addition, during the pre-maximum stage, novaspectral type of T Pyx is thought to evolve from He/N type to Fe II one.

Low-Resolution Spectroscopy of the Recurrent Nova T Pyxidis at its Early Stage of 2011 Outburst