Context. Physical and phenomenological properties (radius, luminosity, shape of the light curve, etc.) of Cepheids strongly depend on the pulsation period, with the exception of the pulsation amplitude. A possible factor causing a wide range of pulsation amplitudes might be the different atmospheric metallicities of individual Cepheids. Aims: We

We present the Northern Massive Dim Stars Survey (NoMaDS), a high-resolution spectroscopic campaign at the 9.2m Hobby-Eberly Telescope. The project aims at building the most complete and homogeneous spectroscopic database of hot, massive Galactic OB stars. NoMaDS is part of an international collaboration that combines observations from Chilean

We present the discovery of sub-stellar mass companions to six giant stars by the ongoing Penn State-Torun Planet Search conducted with the Hobby-Eberly Telescope. Each system has a single planet, with minimum masses ranging from 0.9 to 5.3 MJ and orbits ranging from 0.9 to 5.6 years, the longest period yet found by our survey. Three other stars

We use Hubble Space Telescope (HST) and ground-based imaging to study the multiple populations of 47 Tucanae (47 Tuc), combining high-precision photometry with calculations of synthetic spectra. Using filters covering a wide range of wavelengths, our HST photometry splits the main sequence into two branches, and we find that this duality is

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