2022.10.13 - Jorge García Rojas
Channel: Coloquio IRyA
Date: 2022-10-20

Speaker info: Dr. Jorge García Rojas, Severo Ochoa Postdoc, IAC, Spain

Title: The high abundance discrepancy problem in planetary nebulae through the eyes of a MUSE
Abstract:
The discrepancy between chemical abundances computed using optical recombination lines (ORLs) and collisionally excited lines (CELs) is a major unresolved problem that has been plagued nebular astrophysics in the last 70 years, and is generally characterized by the ratio between ORL and CEL abundances, i. e. the abundance discrepancy factor (ADF). In particular, In planetary nebulae (PNe) with large abundance discrepancies, there is increasing evidence that such discrepancy is caused by the presence of two gas phases: a hot component with standard metallicity, and a much cooler plasma with a highly enhanced content of heavy elements relative to hydrogen. Recent findings show that the largest abundance discrepancies are reached in PNe with close binary central stars and support the fact that probably two different gas phases coexist in these nebulae and that high abundance discrepancies can be explained in a framework of binary evolution. In this talk I will focus on the recent results obtained based on the analysis of IFU MUSE data of some high-ADF PNe .