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We have carried out a search for optically visible post-Asymptotic GiantBranch (post-AGB) stars in the Large Magellanic Cloud (LMC). First, we selectedcandidates with a mid-IR excess and then obtained their optical spectra. Wedisentangled contaminants with unique spectra such as M-stars, C-stars,planetary nebulae, quasi-stellar objects and background galaxies. Subsequently,we performed a detailed spectroscopic analysis of the remaining candidates toestimate their stellar parameters such as effective temperature, surfacegravity (log g), metallicity ([Fe/H]), reddening and their luminosities. Thisresulted in a sample of 35 likely post-AGB candidates with late-G to late-Aspectral types, low log g, and [Fe/H] < -0.5. Furthermore, our study confirmedthe existence of the dusty post-Red Giant Branch (post-RGB) stars, discoveredpreviously in our SMC survey, by revealing 119 such objects in the LMC. Theseobjects have mid-IR excesses and stellar parameters (Teff, log g, [Fe/H])similar to those of post-AGB stars except that their luminosities (< 2500Lsun), and hence masses and radii, are lower. These post-RGB stars are likelyto be products of binary interaction on the RGB. The post-AGB and post-RGBobjects show SED properties similar to the Galactic post-AGB stars, where somehave a surrounding circumstellar shell, while some others have a surroundingstable disc similar to the Galactic post-AGB binaries. This study also resultedin a new sample of 162 young stellar objects, identified based on a robust logg criterion. Other interesting outcomes include objects with an UV continuumand an emission line spectrum; luminous supergiants; hot main-sequence stars;and 15 B[e] star candidates, 12 of which are newly discovered in this study.

Optically Visible Post-AGB Stars, Post-RGB Stars and Young Stellar Objects in the Large Magellanic Cloud