Abstract
We explore the possibility that a charged particle moving in thegravitational field generated by a scalar star could radiateenergy via a recently proposed gravitational Cerenkovmechanism. We provenumerically that this is not possible forstable boson stars. We also show that soliton stars could haveCerenkov radiation for particular values of the boson mass,althoughthe diluteness of the star grows and actual observationalpossibility decreases for the more usually discussed boson masses.These conclusions diminish, although do not completely rule out, theobservational possibility of actuallydetecting scalar stars using this mechanism, and lead us to considerother forms, such as gravitational lensing.
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