Guzman-Ramirez, LizettePineda, J EZijlstra, Albert AStancliffe, R JKarakas, Amanda2015-12-130035-8711http://hdl.handle.net/1885/77600To understand the chemical evolution of the Galaxy, we need to understand the contribution of planetary nebulae (PNe) in the 3He abundance. 3He abundances have been detected only in a couple of PNe; their abundances are consistent with the standard modelsKeywords: Circumstellar matter; Planetary nebulae: general; Radio lines: general; Stars: abundances201310.1093/mnras/stt5122016-02-24