We present observations and analyses of some of the most massive stars in the Milky Way, showing the potential and limits of current model atmospheres, and the...
Massive stars in metal-poor dwarf galaxies are often extreme rotators
We probe how common extremely rapid rotation is among massive stars in the early universe by measuring the OBe star fraction in nearby metal-poor dwarf galaxies...
The theory of radiatively-driven winds successfully explains the key points of the stellar winds of hot massive stars. However, it has been recently found that...
Massive Stars: Some Open Questions and the Role of Multi-Object Spectroscopy
Massive stars are key ingredients in the evolution of the Universe. Yet, important uncertainties and limits persist in our understanding of these objects, even...
Massive stellar systems: observational challenges and perspectives in the E-ELT era
We introduce the empirical framework concerning optical and near-infrared (NIR) photometry of crowded stellar fields. In particular, we address the impact that...
The MASTER auto-detection system at Tunka (Baykal Lake) detected a new transient source at the position (R.A., Dec) = 16h 39m 42.75s, +12d 24m 14s.4, (J2000)...
MASTER Follow-up Observations of LIGO GW170104 Event
We present the results of MASTER Global Robotic Net optical observations of the LIGO GW170104 error-box during the LIGO/Virgo O2 run. We observed 3421 square...