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We have identified a first group of 33 new candidates for symbiotic stars(SySt) of the accreting-only variety among the 600,255 stars so far observed bythe GALAH high-resolution spectroscopic survey of the Southern Hemisphere, morethan doubling the number of those previously known. GALAH aims to highlatitudes and this offers the possibility to sound the Galaxy for new SySt awayfrom the usual Plane and Bulge hunting regions. In this paper we focus on SyStof the M spectral type, showing an Halpha emission with a peak in excess of 0.5above the adjacent continuum level, and not affected by coherent radialpulsations. These constraints will be relaxed in future studies. The 33 newcandidate SySt were subjected to a vast array of follow-up confirmatoryobservations (X-ray/UV observations with the Swift satellite, search foroptical flickering, presence of a near-UV upturn in ground-based photometricand spectroscopic data, radial velocity changes suggestive of orbital motion,variability of the emission line profiles). According to Gaia eDR3 parallaxes,the new SySt are located at the tip of the Giant Branch, sharing the samedistribution in M(Ks) of the well established SySt. The accretion luminositiesof the new SySt are in the range 1-10 Lsun, corresponding to mass-accretionrates of 0.1-1x10(-9) Msun/yr for WDs of 1 Msun. The M giant of one of the newSySt presents a large Lithium over-abundance.

The GALAH Survey and Symbiotic Stars. I. Discovery and follow-up of 33 candidate accreting-only systems