Member stars of the GD1 tidal stream from the SDSS, LAMOST and Gaia
  surveys
  With the photometric data from the SDSS survey, the spectroscopic data from
the SDSS/SEGUE and the LAMOST surveys, and the astrometric data from the Gaia
DR2, we have identified 71 highly-probable member stars of the GD-1 cold
stellar stream spread along almost its entire length (i.e. from 126 to 203
degree in Right Ascension). With the accurate spectroscopic (i.e. metallicity
and line-of-sight velocity) and astrometric (i.e. proper motions) information,
the position-velocity diagrams, i.e. $\phi_{1}$-$\mu_{\alpha}$,
$\phi_{1}$-$\mu_{\delta}$ and $\phi_{1}$-${v_{\rm gsr}}$, of the GD-1 stream
are well mapped. The stream has an average metallicity [Fe/H] $= -1.95 \pm
0.23$. The rich information of member stars of the stream now available allow
one not only to model its origin, but also to place strong constraints on the
mass distribution and the gravitational potential of the Milky Way.
