A sample of 678 in the Magellanic Clouds will be observed in order to obtain multiple radial-velocity (RV) measurements. This survey is a spectroscopic follow-up of the ellipsoidal binary stars discovered by the Optical Gravitational Lensing Experiment (OGLE), in order to study the short-period binary population, with periods less than 2.5 days and for discovery of dormant black holes and neutron stars in non-interacting systems. PI Michal Pawlak (Jagiellonian University), Tsevi Mazeh (Tel Aviv University) Spectroscopic Discovery of Binaries with Dormant Black Holes The survey will provide stellar ages, radial velocities and chemical abundances for 130,000 stars, and will thus increase the number of stars in dwarf galaxies and streams with detailed abundance information (>15 elements) by several orders of magnitude by quantifying the number of previous mergers in the Milky Way, and within the dwarf galaxies themselves. This survey aims at providing new and valuable insights into: 1) the properties of the first stars 2) various nucleosynthetic channels, such as SN type Ia, AGB stars and the r-process 3) The hierarchical galaxy formation, e.g. In addition, the survey will focus on the Sagittarius stream, which is a major constituent of the Galactic halo, and presents our best opportunity to observe a galaxy being currently disrupted. PI Asa Skuladottir (University of Florence)ĤDWARFS will target all the dwarf galaxies in the 4MOST footprint, in particular the main bodies of three large dwarf spheroidal galaxies, Sagittarius, Fornax and Sculptor. Together these analyses will map the mass of the Milky Way out to 100 kpc and test models of the dark sector.ĤMOST survey of dwarf galaxies and their stellar streams (4DWARFS): small but fundamental. It will also enable the identification of coherent dynamically-cold streams. ![]() Armed with the missing radial velocity, 4GRoundS will provide the community an exquisite sample that will enable studies of the orbital structure of the halo and outer disk, and allow realistic modelling of these components. Their excellent photometric distances enable the exquisite Gaia proper motions to be converted into physically-useful transverse velocities. The most accurate distances to old, distant stellar populations are those to RR Lyrae, making them invaluable dynamical tracers of the Galaxy. This survey aims at measuring the radial velocities and metallicities of RR Lyrae stars selected from Gaia DR3. ![]() PI Rodrigo Ibata (Observatoire Astronomique de Strasbourg) Galactic surveys 4MOST Gaia RRLyrae Survey (4GRoundS) Following the recommendations of the Public Survey Panel (PSP) and Observing Programmes Commitee (OPC), ESO has selected fiftheen surveys to be conducted during the first five years of 4MOST operations, together with the ten GTO surveys.
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