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Stellar Weather Watch
In a new paper, Simon Jeffery reports the discovery of standing waves on two small hot stars similar to the pattern of jet streams seen in the Earth’s atmosphere.
Stars
Hydrogen-Deficient Stars 2018 – Armagh Observatory and Planetarium
September 2018 will see over 50 astronomers from around the world gather at the Armagh Observatory and Planetarium to discuss the latest news about hydrogen-deficient stars. These stars have lost nearly all the hydrogen from which they were made, to leave only nuclear ash. Astronomers want to learn how these rare and short-lived remnants formed, and what drives their spectacular changes in brightness.
Stars
Discovery of the first new extreme helium star for 40 years
In a paper entitled ‘GALEX J184559.8−413827: a new extreme helium star identified using SALT’, Armagh astronomer Simon Jeffery reports the first new extreme helium star to be discovered in nearly 40 years. Extreme helium stars represent a small group of low-mass supergiant stars. They have spectral types equivalent to A Read more…