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Symbiotic stars (SySts) are long-period interacting binaries composed of ahot compact star, an evolved giant star, and a tangled network of gas and dustnebulae. They represent unique laboratories for studying a variety of importantastrophysical problems, and have also been proposed as possible progenitors ofSNIa. Presently, we know 257 SySts in the Milky Way and 69 in externalgalaxies. However, these numbers are still in striking contrast with thepredicted population of SySts in our Galaxy. Because of other astrophysicalsources that mimic SySt colors, no photometric diagnostic tool has so fardemonstrated the power to unambiguously identify a SySt, thus making therecourse to costly spectroscopic follow-up still inescapable. In this paper wepresent the concept, commissioning, and science verification phases, as well asthe first scientific results, of RAMSES II - a Gemini Observatory InstrumentUpgrade Project that has provided each GMOS instrument at both Geminitelescopes with a set of narrow-band filters centered on the Raman OVI 6830 Aband. Continuum-subtracted images using these new filters clearly revealedknown SySts with a range of Raman OVI line strengths, even in crowded fields.RAMSES II observations also produced the first detection of Raman OVI emissionfrom the SySt LMC 1 and confirmed Hen 3-1768 as a new SySt - the firstphotometric confirmation of a SySt. Via Raman OVI narrow-band imaging, RAMSESII provides the astronomical community with the first purely photometric toolfor hunting SySts in the local Universe.

RAMSES II - RAMan Search for Extragalactic Symbiotic Stars. Project concept, commissioning, and early results from the science verification phase