The problem of the collapse of a self gravitating disk is here considered. We show self-similar solutions for the above problem under a modified viscous parameter. Surface density depends on rm in the inner region, where m is -1.6. Therefore growing central mass goes on without mass inflow to the system.

• 유계화(이화여자대학교 과학교육과) | KYE HWA YOO (Department of Science Education, Ewha Womans University)
• 윤태석(경북대학교 천문대기과학과) | TAE SEOG YOON (Department of Astronomy and Atmospheric Sciences, Kyungpook National Universit)
• 강용희(경북대학교 지구과학교육과) | YONG HEE KANG (Department of Earth Science Education, Kyungpook National University)