S. Josephine Chan
Diamond Light Source
 

"Search for Evolved Objects: Candidates"
 

Processed material is returned to the interstellar medium during the late stages of stellar evolution, to enrich the existing gas and to form new generations of stars. The main outcome of the studies carried out during the post‑IRAS phase was to establish reliable selection criteria based on IRAS colours which enable us to select well defined and statistically meaningful samples of the evolved objects from PSC.  Nevertheless, the determination of special colour regions for the evolved objects provides us with a powerful tool to search for new candidates for these groups of infrared sources. The pilot approach is to study the Spitzer-IRAC colour diagram of LMC. While we have a global picture of all infrared objects (e.g.: post-AGB stars) in a galaxy, we can split some groups. This is because the sample is all at the same distance to a good approximation. The main approach is to find out how many candidate objects there are in the GLIMPSE archives. Once the group of interesting objects are found, 2MASS data and for MIPS data (especially at 24µm) to further refine the selection.  Preliminary search results will be presented.