The Stellar “Snake” I: Whole Structure and Properties. (arXiv:2109.05999v1 [astro-ph.GA])

The Stellar “Snake” I: Whole Structure and Properties. (arXiv:2109.05999v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Fan_W/0/1/0/all/0/1">Wang Fan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hai_Jun_T/0/1/0/all/0/1">Tian Hai-Jun</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dan_Q/0/1/0/all/0/1">Qiu Dan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Qi_X/0/1/0/all/0/1">Xu Qi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Min_F/0/1/0/all/0/1">Fang Min</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hao_T/0/1/0/all/0/1">Tian Hao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Di_L/0/1/0/all/0/1">Li Di</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bird_S/0/1/0/all/0/1">Sarah Bird</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jian_Rong_S/0/1/0/all/0/1">Shi Jian-Rong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Xiao_Ting_F/0/1/0/all/0/1">Fu Xiao-Ting</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gao_Chao_L/0/1/0/all/0/1">Liu Gao-Chao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sheng_C/0/1/0/all/0/1">Cui Sheng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yong_Z/0/1/0/all/0/1">Zhang Yong</a>

To complement our previous discovery of the young snake-like structure in the
solar neighborhood and reveal the structure’s full extent, we explore {tt Gaia
EDR3} data within and surround the “snake” territory. With the
friends-of-friends algorithm, we identify 2694 and 9615 Snake member candidates
from the two samples. Thirteen open clusters are embedded in these member
candidates. By combining the spectroscopic data from multiple surveys, we
investigate the comprehensive properties of the candidates and find that they
actually belong to one sizable structure, since most of the components are well
bridged in their spatial distributions, and follow a single stellar population
with an age of $30-40$,Myr and with solar metallicity. This sizable structure
should be a hierarchically primordial structure, and probably formed from a
filamentary giant molecular cloud with different formation history in the local
regions. The whole structure is expanding. To further analyze the dynamics of
the Snake, we divide the structure into five groups according to their
tangential kinematics. We find that the groups are expanding at a coherent rate
($kappa_Xsim3.0,times10^{-2},rm km,s^{-1},pc^ {-1}$) in along the
length of the structure ($X$ direction). With over ten thousand member stars,
the Snake is an ideal laboratory to study nearby coeval stellar formation,
stellar physics, and environmental evolution over a large spatial extent.

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