Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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.

14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
2
The categories of this paper are: math