Arved Sapar

Arved-Ervin Sapar (7 February 1933 – 1 December 2021) was an Estonian theoretical astrophysicist and cosmologist. He was elected a member of the Estonian Academy of Sciences in 1990 and worked for most of his career at the institutions that evolved into the Tartu Observatory.

Independent obituaries in Estonia’s cultural weekly Sirp and public broadcaster Eesti Rahvusringhääling described his long-running leadership roles in stellar-atmosphere research organizations in the late Soviet period and his continued work at Tõravere after Estonia regained independence.

Early life and education Sapar was born in Paatna village, Rakvere Parish (historically, Virumaa). He completed secondary school in Rakvere and graduated from the University of Tartu in 1957, specializing in theoretical physics.

ERR’s obituary notes that he held international scientific-organization roles, including work connected to the International Astronomical Union and leadership roles in Soviet-era stellar-atmosphere working groups and astronomical societies. He was also awarded the Estonian Academy of Sciences Medal (1986). A minor planet was named in his honour; this is described in Estonian popular-history coverage and in Academy yearbook material. Sapar, A.; Sapar, L.; Poolamäe, R. (2003). “Analytical solutions for saturated P Cygni type profiles II: General case.” Astrophysics and Space Science 286:333. Sapar, A. (2000). “Modelling and diagnostics of smooth winds.” In: Thermal and Ionization Aspects of Flows from Hot Stars: Observations and Theory (ASP Conf. Ser. 204).