SIMBAD references

2018ApJ...866...30E - Astrophys. J., 866, 30-30 (2018/October-2)

The mass of the Cepheid V350 Sgr.

EVANS N.R., PROFFITT C., CARPENTER K.G., WINSTON E.M., KOBER G.V., GUNTHER H.M., GORYNYA N., RASTORGUEV A. and INNO L.

Abstract (from CDS):

V350 Sgr is a classical Cepheid suitable for mass determination. It has a hot companion which is prominent in the ultraviolet (UV) and which is not itself a binary. We have obtained two high-resolution echelle spectra of the companion at orbital velocity maximum and minimum with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope in the 1320 to 1510 Å region. By cross-correlating these spectra we obtained the orbital velocity amplitude of the companion with an uncertainty in the companion amplitude of 1.9 km s–1. This provides a mass ratio of the Cepheid to the companion of 2.1. The UV energy distribution of the companion provides the mass of the companion, yielding a Cepheid mass of 5.2 ± 0.3 M. This mass requires some combination of moderate main sequence core convective overshoot and rotation to match evolutionary tracks.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: spectroscopic - stars: fundamental parameters - stars: variables: Cepheids

Simbad objects: 9

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2019.09.19-19:40:38

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