protosun

protosun

[′prōd·ō‚sən]
(astronomy)
The condensation of material that lay at the center of the solar nebula and accreted material from it to form the sun.
References in periodicals archive ?
The moment the protosun and protoplanets were beginning to take their final forms into the solar system you see today, the sun ignited and gave off a huge blast of solar wind.
These coalesced to form a central core, the putative protosun.
Thus the disk's angular momentum must be redistributed outward, which allows the inner-disk material to join the protosun while outlying matter is spun to greater radii.
Once the accumulating disk achieves a mass roughly one-third that of the protosun, it becomes gravitationally unstable and changes from an elegant, symmetric item of cosmic dinnerware to something less regular, perhaps resembling a miniature galaxy.