Amplitude Modulation of Cepheid Radial Velocity Curves as a Systematic Source of Uncertainty for Baade-Wesselink Distances

Anderson, Richard I. ; Anderson, Richard I.

In: Proceedings of the International Astronomical Union, 2014, vol. 9, no. S307, p. 286-287

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    I report on the recent discovery of modulation in the radial velocity curves in four classical Cepheids. This discovery may enable significant improvements in the accuracy of Baade-Wesselink distances by revealing a not previously considered systematic source of uncertainty