Kavli Affiliate: Moritz Guenther
| Summary:
Cepheid masses continue to be important tests of evolutionary tracks for intermediate mass stars as well as important predictors of their future fate. For systems where the secondary is a B star, it Hubble Space Telescope ultraviolet spectra have been obtained. From these spectra a temperature can be derived, and from this a mass of the companion M$_2$. Once it Gaia DR4 is available, proper motions can be used to determine the inclination of the orbit.
Combining mass of the companion, M$_2$, the mass function from the ground-based orbit of the Cepheid and the inclination produces the mass of the Cepheid, M$_1$. The Cepheid system FN Vel is used here to demonstrate this approach and what limits can be put on the Cepheid mass for inclination between 50 and 130$^o$.
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