Publications (11)
591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2
Yin-Bi Li, A-Li Luo, You-Jun Lu +14
In this paper, we report 591 high velocity star candidates (HiVelSCs) selected from over 10 million spectra of the data release seven (DR7) of the Large Sky Area Multi-object Fiber…
Gaia DR2 in 6D: Searching for the fastest stars in the Galaxy
T. Marchetti, E. M. Rossi, A. G. A. Brown
We search for the fastest stars in the subset of stars with radial velocity measurements of the second data release (DR2) of the European Space Agency mission Gaia. Starting from t…
The intense production of silicates during the final AGB phases of intermediate mass stars
E. Marini, F. Dell'Agli, D. Kamath +7
The formation of silicates in circumstellar envelopes of stars evolving through the AGB is still debated given the uncertainties affecting stellar evolution modelling, the descript…
Constraints on the Galactic Centre environment from Gaia hypervelocity stars
F. A. Evans, T. Marchetti, E. M. Rossi
Following a dynamical encounter with Sgr A*, binaries in the Galactic Centre (GC) can be tidally separated and one member star ejected as a hyper-velocity star (HVS) with a velocit…
An artificial neural network to discover Hypervelocity stars: Candidates in Gaia DR1/TGAS
T. Marchetti, E. M. Rossi, G. Kordopatis +5
The paucity of hypervelocity stars (HVSs) known to date has severely hampered their potential to investigate the stellar population of the Galactic Centre and the Galactic Potentia…
Predicting the hypervelocity star population in Gaia
T. Marchetti, O. Contigiani, E. M. Rossi +3
Hypervelocity stars (HVSs) are amongst the fastest objects in our Milky Way. These stars are predicted to come from the Galactic center (GC) and travel along unbound orbits across…
A study of oxygen-rich post-AGB stars in the Milky Way to understand the production of silicates from evolved stars
F. Dell'Agli, S. Tosi, D. Kamath +4
The study of post asymptotic giant branch (post-AGB) stars is a valuable tool to study still poorly known aspects of the evolution of the stars through the AGB. This is due to the…
New candidate hypervelocity red clump stars in the inner Galactic bulge
A. Luna, T. Marchetti, M. Rejkuba +5
We search for high-velocity stars in the inner region of the Galactic bulge using a selected sample of red clump stars. Some of those stars might be considered hypervelocity stars…
Joint constraints on the Galactic dark matter halo and Galactic Centre from hypervelocity stars
Elena M. Rossi, T. Marchetti, M. Cacciato +2
The mass assembly history of the Milky Way can inform both theory of galaxy formation and the underlying cosmological model. Thus, observational constraints on the properties of bo…
Milky Way archaeology using RR Lyrae and type II Cepheids II. High velocity RR Lyrae stars, and mass of the Milky Way
Z. Prudil, A. J Koch-Hansen, B. Lemasle +10
We report the discovery of high velocity candidates among RR~Lyrae stars found in the Milky Way halo. We identified 9 RR~Lyrae stars with Galactocentric velocities exceeding the lo…
On measuring the Galactic dark matter halo with hypervelocity stars
O. Contigiani, E. M. Rossi, T. Marchetti
Hypervelocity stars (HVSs) travel from the Galactic Centre across the dark matter halo of the Milky Way, where they are observed with velocities in excess of the Galactic escape sp…