Radio stars of the SKA
  Radio emission from stars can be used, e.g., to study ionized winds or
stellar flares. The radio emission is faint and studies have been limited to
few objects. The Square Kilometer Array (SKA) will bring a survey ability to
the topic of radio stars. In this paper we investigate what the SKA can detect,
and what sensitivity will be required for deep surveys of the stellar Milky
Way. We focus on the radio emission from OB stars, Be stars, flares from M
dwarfs, and Ultra Compact HII regions. The stellar distribution in the Milky
Way is simulated using the Besancon model, and various relations are used to
predict their radio flux. We find that the full SKA will easily detect all
UltraCompact HII regions. At the limit of 10 nJy at 5 GHz, the SKA can detect
1500 Be stars and 50 OB stars per square degree, out to several kpc. It can
also detect flares from 4500 M dwarfs per square degree. At 100 nJy the numbers
become about 8 times smaller. SKA surveys of the Galactic plane should be
designed for high sensitivity. Deep imaging should consider the significant
number of faint flares in the field, even outside the plane of the Milky Way.
