Kavli Affiliate: Moritz Guenther
| First 5 Authors: Nancy Remage Evans, Alexandre Gallenne, Pierre Kervella, H. Moritz Guenther, Joanna Kuraszkiewicz
| Summary:
The system V350 Sgr has a classical Cepheid for the primary. Interferometry
is presented for the system and the full orbit is determined. The mass of the
companion has been determined from an {it IUE} spectrum and comparison with
the mass-temperature relation from Detached Eclipsing Binaries. Combined with
the mass of the companion (2.6 $pm$ 0.2 M$_odot$), the mass of the Cepheid is
determined to be 4.7 $pm$ 0.8 M$_odot$. For systems with less complete
information, Cepheid masses can be determined from a single-lined spectroscopic
orbit, {it Gaia} proper motion anomalies, and the mass of the companion from
the ultraviolet. Uncertainties resulting from different approaches to mass
determination are discussed, and are expected to be reduced after the {it
Gaia} DR4 release. Temperatures for Morgan Keenan (MK) standard stars from the
ultraviolet are also provided.
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