BONN, Aug. 19—The two daughters of Sheik Mujibur Rahman, who was killed in Dacca with the rest of his family in a coup d'état Friday, are in seclusion in the Bangladesh Embassy in Bonn.

The two women—Hasina, who is 26 years old, and Rehana, who is 16, arrived here for a vacation two weeks ago. Hasina's husband, Dr. Wajed Mia, is a student at the German Atomic Research Center in Karlsruhe.

According to Ambassador Humayun Rasheed Choudhury, the daughters have been unable to find out anything about their father beyond what they had heard in news reports.