Hedayat received 9 1/2 years, while Asadi was given seven years.
The charges against them included insulting Iran’s leaders and acting against national security.
Hedayat's husband, Amin Ahmadian, has described her sentence as "shocking." He said it seems to be aimed as a warning to students and called it an attempt to create fear ahead of the first anniversary of last year's presidential vote.
The student group's website, advarnews.us, says the severity of the sentences are unprecedented.
Both Hedayat and Asadi were reportedly arrested in December 2009.
Here is a video message from Hedayat -- in Persian with English subtitles -- in which she speaks about the pressures faced by Iranian student activists and the role the activists play in Iran’s pro-democracy movement. She says students have been the main victims of the postelection crackdown in Iran:
-- Golnaz Esfandiari