D-type Symbiotic Systems and its relation with Mira variable stars.

N. E. NUÑEZ; E. DONOSO; M. JAQUE ARANCIBIA; M. GROSSO; L. VEGA; N. MAZA

La Serena

Congreso; Reunión Binacional AAA-SOCHIAS; 2018

Asociación Argentina de Astronomía- Asociación Chilena de Astronomía

About half of all stars are actually binary systems where some of the most dramatic brightness fluctuations happen very often. This means variability and binarity are closely linked through the lifetime of stars. Symbiotic Systems (SS) are interactive binaries where important physical processes such as mass transfer, disk instabilities, Raman dispersion and wind collisions are of great relevance. There is a renewed interest in SS, as evidence suggest they might be precursors of SNIa (Meng & Han 2016; Dimitriadis et al. 2014).So far, only 253 SS are known (Akras et al., in preparation). Therefore, it is very important to increase the number of objects in order to improve their statistical footprint and to do a fair comparison with stellar evolutionary models (e.g. Mohamed S. & Podsiadlowski 2007, 2010, 2011).We conducted a new search of SS, focusing in particular in the least studied symbiotic systems known as Symbiotic Mira (SM), in which the two stellar components and the nebular envelope are present. For that, we devised a new identification procedure that incorporates both color and variability criteria.