We have developed a technique for the measurement of state-to-state rotational relaxation rates due to collisions in the gas phase. A single J state of the v_{2}=1 vibrational level of acetylene is populated by a Stimulated Raman process. After a variable delay of a few ns we record high resolution (˜ 0.003 cm^{-1}) spectra of the Q-branch of the v

Context: The knowledge of the binary properties of metal-poor and solar-metallicity stars can shed light on the potential differences between the formation processes responsible for both types of objects. Aims: The aim of the project is to determine the binary properties (separation, mass ratio, frequency of companions) for M subdwarfs, the low

Context: γ Dor stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the knowledge of these stars considerably. Aims: A selected group of γ Dor stars and some candidates were observed with the Mercator telescope to find and/or confirm the

gamma Dor stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the knowledge of these stars considerably. A selected group of gamma Dor stars and some candidates were observed with the Mercator telescope to find and/or confirm the

One of the most useful spectral windows for spectropolarimetric investigations of the solar chromosphere is the one provided by the spectral lines of the He I 10830 Å multiplet, whose polarization signals are sensitive to the Hanle and Zeeman effects. However, in order to be able to carry out reliable diagnostics of the dynamic and magnetic

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