Table of Contents
Galaxies, Volume 6, Issue 3 (September 2018)
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Cover Story (view full-size image) Most of the visible matter in our Galaxy and other galaxies is in the form of stars. If two stars [...] Read more. Most of the visible matter in our Galaxy and other galaxies is in the form of stars. If two stars started their lives close together, their life stories could be changed dramatically by an interaction between them. An example of a fate-changing interaction is a common envelope event, during which two stars temporarily orbit within a shared envelope. The episode ends with an exciting outburst, leaving behind either a significantly shrunken binary, or a single merged star. The outburst could be observed as recently discovered Luminous Red Novae. The expelled envelope starts its expansion and could appear in a future as a planetary nebulae. Physics of these violent interactions is a key for to understand life-stories of X-ray binaries, Type Ia supernovae, and progenitors of gravitational wave sources recently observed by the Laser Interferometer Gravitational-Wave Observatory (LIGO). View the paper