FS CMa Objects In The Outer Galaxy And The Large Magellanic Clouds

FS CMa objects is a group of intermediate luminosity B- and early A-type stars that exhibit the B[e] phenomenon (simultaneous presence of forbidden lines and a strong IR excess). Their nature is not completely clear yet, but there is strong evidence that these objects are not very young or very evolved. They most likely recently created circumstellar dust, which has not been previously thought to exist around stars of this temperature and luminosity range. Theoretical mass loss rates from single stars are insufficient to explain the strong emission-line spectra of FS CMa objects, thus we suggest that they are a group of binary systems that have experienced strong mass transfer, responsible for the formation of extended gaseous and dusty envelopes. Currently the FS CMa group contains only objects brighter than V = 15 mag located within about 4 kpc from the Sun. Being ultimately identified by spectroscopy, FS CMa objects show distinct photometric properties that allow us to search for them in catalogs of faint emission-line stars and IR data. Here we present a list of recently found fainter candidates to the group both in the Galaxy, some of which are located over 10 kpc from the Galactic center, and in the Large Magellanic Cloud. We believe that further investigation of these candidates will expand the FS CMa group and show that dust formation near hot non-supergiant stars can occur even in lower-metallicity environments. FS CMa objects appear to be important producers of dust in the Galaxy, and their role in dust production in the earlier universe might have been even higher.