A WISE view on extreme AGB stars

(abridged) Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period related to luminosity and mass-loss rate (MLR) star. Long-period variables (LPVs) Mira are most prominent all types variability evolved stars. However, reddest, obscured AGB too faint in optical have eluded large surveys. Our goal obtain sample LPVs with MLRs by analysing WISE W1 W2 light curves (LCs) for about 2000 sources, photometrically selected include known C-stars 11.3 mu silicon carbide dust feature absorption, Galactic O-stars periods longer than 1000 days. Epoch photometry was retrieved from AllWISE NEOWISE database fitted sinus curve. Photometry other surveys also downloaded fitted. For subset 316 reddest stars, spectral energy distributions (SEDs) were constructed, and, together mid-infrared (MIR) spectra when available, radiative transfer programme order derive MLRs. based LCs fits data presented Inspired recent paper, number non-variable OH/IRs identified. Based selection amplitude, 750 (candidate) which 145 over days, many them being new. colours C-rich extremely red objects (EROs) fitting SEDs (and available MIR spectra) separates into C- O-rich objects. The EROs appears be complete up 5~kpc total return solar neighbourhood this class determined. Magellanic Clouds, bolometric derived.