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stellar evolution

This tag is associated with 49 posts

A Mystery Star Wrapped in a Stingray

How can a star heat up by 40,000 K in just 30 years? Reindl et al. explore the star at the heart of the Stingray Nebula to find out.

A New Way to Die: What Happens to Supermassive Stars?

Supermassive black holes are everywhere in our Universe, but we don’t know where they came from. Supermassive stars could have given birth to these massive objects. However, that is not all these fifty to one hundred solar mass stars could be responsible for…

One Star, Two Star, Brown Star, Blue Star

Enter the observed oddball: a subdwarf B (sdB) star. These unexpected stars are fusing helium into carbon and oxygen in their core and only have a thin hydrogen envelope. So, where did the hydrogen go?

A star with a fake ID?

Most binary stars probably formed at the same time, meaning all stars in the same system should have the same age. The authors of this paper analyze a stellar binary system where one star appears to be lying about its age, as one star appears 3 billion years older than its companion.

Pulsations and Evolution

Kepler finds a new binary system with a Delta Scuti pulsator.

Timing is Everything: A Pulsar in Orbit

One of nature’s best clocks is a millisecond pulsar. These exotic stellar corpses are neutron stars: incredibly dense, rotating hundreds of times per second, and emitting powerful jets or beams of light. This creates a “pulsing” effect, much like a lighthouse.

Something cataclysmic in the Kepler field

Cataclysmic variables are binary star systems where one of the stars—a white dwarf—devours its main sequence partner over time. Kepler proves yet again that it can find a lot more than just exoplanets by identifying a cataclysmic variable with a period of less than an hour.

Dark matter and the Solar Interior

Depending on how they scatter with nuclei, dark matter particles might affect the structure and evolution of our Sun.

Progenitors of AM CVn systems

The progenitors of a special type of cataclysmic variable, AM CVn, and possibly supernovae have been found.

A Second Case for a Double Blue Straggler Sequence

The authors identify two distinct sequences of blue straggler stars in the globular cluster NGC 392. They hypothesize that one branch is formed via stellar mergers and the other is binary stars undergoing mass transfer. This is the second globular cluster found to possess this double sequence.

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