VELOCE observations trace the expansion and contraction of Cepheid stars with unprecedented precision. (IMAGE)

Ecole Polytechnique Fédérale de Lausanne

VELOCE observations trace the expansion and contraction of Cepheid stars with unprecedented precision.

Caption

VELOCE observations trace the expansion and contraction of Cepheid stars with unprecedented precision. On the left: observed spectra of the Cepheid archetype Delta Cephei as they change in wavelength due to the pulsations. On the right: the radial velocity curve measured by VELOCE, with the star's variable size shown (not to scale) using star-shaped symbols.

Credit

R.I. Anderson (EPFL)

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