Chemical compositions of stars in two stellar streams from the Galactic
  thick disk
  We present abundances for 20 elements for stars in two stellar streams
identified by Arifyanto & Fuchs (2006, A&A, 449, 533): 18 stars from the
Arcturus stream and 26 from a new stream, which we call AF06 stream, both from
the Galactic thick disk. Results show both streams are metal-poor and very old
(10$-$14 Gyrs) with kinematics and abundances overlapping with the properties
of local field thick disk stars. Both streams exhibit a range in metallicity
but with relative elemental abundances that are identical to those of thick
disk stars of the same metallicity. These results show that neither stream can
result from dissolution of an open cluster. It is highly unlikely that either
stream represents tidal debris from an accreted satellite galaxy. Both streams
most probably owe their origin to dynamical perturbations within the Galaxy.
