Abstract. Stellar streams are a group of gravitationally unbound stars which share same kinematic properties, and hence form coherent structures in the velocity space. Their origin is not clear. The concept of stellar streams or moving groups was introduced much early (Eggen 1958) and were thought as dispersed cluster remnants retaining the original kinematics. Subsequently, studies suggested that these are debris of accreted satellite galaxy in the Milkyway and belong to an old stellar population in the solar neighborhood. Kinematic studies reveal that the stream member stars are old and belong to thick disk of the Galaxy. Satellite acceretion scenario is one front runner proposal for the thick disk formation in the Galactic disk. In this study, we have explored one of the streams, known as Arcturus stream, through high resolution spectroscopy. Preliminary abundance results for a sample of Arcturus stream are obtained and compared with groups of stars that belong to thick disk and dwarf spheroidals. Alpha elements, that are known to be produced mainly in the massive but short lived SNII, seem to be enhanced relative to Fe, a dominant product in long lived SNIa. This suggests that the Arcturus stream stars are old and are mostly produced in the era where SNII was predominant. Abundance results are very similar to the results of Galactic thick disk, which is a distinct component in the disk, both kinematically and chemically. It seems Arcturus is a subgroup within the thick disk but to establish whether the group is distinct from the thick disk, we have to determine differential age estimate for a sample of thick disk and Arcturus stars at the overlapping [Fe/H].