Obtaining accurate radial velocities for Cepheid companions using the STIS echelles
1 Space Telescope Science Institute, Baltimore, MD 21218, USA
2 Smithsonian Astrophysical Observatory, MS 4, 60 Garden Street, Cambridge, MA 02138, USA
3 European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
4 LESIA, Obs. de Paris, CNRS UMR 8109, UPMC, Univ. Paris 7, 5 Pl. Jules Janssen, 92195 Meudon, France
5 CNRS UMI 3386, Departamento de Astronomía, Universidad de Chile, Las Condes, Chile
Published online: 8 September 2017
We discuss the high dispersion echelle observations of the hot binary companions of six Cepheids with known radial-velocity orbits that we have obtained with the STIS FUV E140H mode on board the Hubble Space Telescope, with the goal of determining the masses of these Cepheids. We discuss the stability and repeatability of the STIS echelle wavelength scale and other issues that may limit the final accuracy of our mass determinations.
© The Authors, published by EDP Sciences, 2017
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