Stars at High Spatial Resolution. (arXiv:1908.05665v1 [astro-ph.SR])

Stars at High Spatial Resolution. (arXiv:1908.05665v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Carpenter_K/0/1/0/all/0/1">Kenneth G. Carpenter</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Belle_G/0/1/0/all/0/1">Gerard van Belle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brown_A/0/1/0/all/0/1">Alexander Brown</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cranmer_S/0/1/0/all/0/1">Steven R. Cranmer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Drake_J/0/1/0/all/0/1">Jeremy Drake</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dupree_A/0/1/0/all/0/1">Andrea K. Dupree</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Creech_Eakman_M/0/1/0/all/0/1">Michelle Creech-Eakman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Evans_N/0/1/0/all/0/1">Nancy R. Evans</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Grady_C/0/1/0/all/0/1">Carol A. Grady</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Guinan_E/0/1/0/all/0/1">Edward F. Guinan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Harper_G/0/1/0/all/0/1">Graham Harper</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Karovska_M/0/1/0/all/0/1">Margarita Karovska</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kolenberg_K/0/1/0/all/0/1">Katrien Kolenberg</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Labeyrie_A/0/1/0/all/0/1">Antoine Labeyrie</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Linsky_J/0/1/0/all/0/1">Jeffrey Linsky</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Peters_G/0/1/0/all/0/1">Geraldine J. Peters</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rau_G/0/1/0/all/0/1">Gioia Rau</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ridgway_S/0/1/0/all/0/1">Stephen Ridgway</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Roettenbacher_R/0/1/0/all/0/1">Rachael M. Roettenbacher</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Saar_S/0/1/0/all/0/1">Steven H. Saar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Walter_F/0/1/0/all/0/1">Frederick M. Walter</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wood_B/0/1/0/all/0/1">Brian Wood</a>

We summarize some of the compelling new scientific opportunities for
understanding stars and stellar systems that can be enabled by sub-milliarcsec
(sub-mas) angular resolution, UV-Optical spectral imaging observations, which
can reveal the details of the many dynamic processes (e.g., evolving magnetic
fields, accretion, convection, shocks, pulsations, winds, and jets) that affect
stellar formation, structure, and evolution. These observations can only be
provided by long-baseline interferometers or sparse aperture telescopes in
space, since the aperture diameters required are in excess of 500 m (a regime
in which monolithic or segmented designs are not and will not be feasible) and
since they require observations at wavelengths (UV) not accessible from the
ground. Such observational capabilities would enable tremendous gains in our
understanding of the individual stars and stellar systems that are the building
blocks of our Universe and which serve as the hosts for life throughout the
Cosmos.

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