Radial velocity measurements secured from a single-trail spectrogram of DY Her yield a mean velocity of -49 km s⁻¹. The velocity curve has been integrated to obtain a radius-excursion curve. A radius ...
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 ...
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