We report first results on elliptic flow of identified particles at midrapi
dity in Au + Au collisions at root (NN)-N-S = 130 GeV using the STAR TPC at
RHIC. The elliptic flow as a function of transverse momentum and centralit
y differs significantly for particles of different masses. This dependence
can be accounted for in hydrodynamic models, indicating that the system cre
ated shows a behavior consistent with collective hydrodynamical flow. The f
it to the data with a simple model gives information on the temperature and
flow velocities at freeze-out.