▪ Abstract In this article we first review the main physical effects to be considered in the
building of evolutionary models of rotating stars on the Upper Main-Sequence (MS). The …

Hypersonic bipolar outflows are a ubiquitous phenomena associated with both young and
highly evolved stars. Observations of Planetary Nebulae, the nebulae surrounding …

An optical imaging study of old nova remnants has revealed previously unobserved features
in the shells of 13 classical novae–DQ Her, FH Ser, HR Del, GK Per, V1500 Cyg, T Aur …

Supernova 1987A, the first naked-eye supernova observed since Kepler's supernova in
1604, defies a number of theoretical expectations. Its anomalies have long been attributed to …

The narrow emission lines from the inner ring around SN 1987A during the first $\sim 2000$
days are modeled. The analysis extends that in Lundqvist & Fransson (1991) to include an …

We examine a binary merger model for the formation of the mysterious triple-ring nebula
surrounding Supernova 1987A, which still has not been convincingly explained in detailed …

We present seven years of radio observations of SN 1987A made with the Australia
Telescope Compact Array. At 1.4, 2.4, 4.8, and 8.6 GHz, the flux density of the radio remnant …

We report late-time spectroscopic observations of the Type IIn supernova (SN) 1998S, taken
14 years after explosion using the Large Binocular Telescope. The optical spectrum exhibits …

We present the results of 2.5 D hydrodynamic calculations of the effects of the underlying
binary system on shaping the ejecta in a classical nova outburst. In the model, the outburst …

Surrounding SN 1987A is a three-ring nebula attributed to interacting stellar winds, yet no
model has successfully reproduced this system. Fortunately, the progenitor's mass-loss …