2 papers
astro-ph.SR2026
Gravitational trapping and ram pressure trapping of ultracompact and hypercompact H II regions
Lauren Martini, André Oliva, Rolf Kuiper +1
Observationally, early H II regions are classified by size into ultracompact and hypercompact configurations. It remains unclear whether these phases are long-lived or transient. U…
astro-ph.SR2025
Gas infall via accretion disk feeding Cepheus A HW2
A. Sanna, A. Oliva, L. Moscadelli +10
The star-forming region Cepheus A hosts a very young star, called HW2, that is the second closest to us growing a dozen times more massive than our Sun. The circumstellar environme…