stellar activity

This tag is associated with 16 posts

Three Stars in a High-Energy Dance

Stars: steady-burning nuclear flames that pierce the darkness of space. Except when they’re not. The star known as HD 181068 is bright, but it’s no standard candle. On closer inspection, this well-studied system is actually home to three stars locked in a complex cosmic dance.

Hide and Seek Planets

Is CoRoT-7d real, or is it stellar activity masquerading as a planet? Haywood et al. build a noise model to analyze CoRoT-7’s activity to find out.

Linking Stellar Age, Rotation, and Magnetic Activity

We have repeatedly seen how Kepler goes above and beyond its original mission of finding exoplanets. Today’s paper is no exception.

Lessons from radio transits

We are used to thinking about planet transits in visible wavelengths. What can we learn from planet transits in the radio band? Today, we discuss what these transits might tell us about the magnetic activity and the atmosphere of a star.

This star lives in exciting times, or, How did Betelgeuse make that funny shape?

Sometimes we see strange shapes when we look through our fancy telescopes and we’re left wondering how they formed. How did the rings and “pearls” of SN1987A form? Or the hexagonal cloud pattern on Saturn? The star Betelgeuse – famous for being Orion’s left shoulder – presents another unusual geometric appearance.

M Dwarfs Are Not Passé

This paper delves into some of the physical properties of early M dwarfs (M0-M4.5), focusing on chromospheric/magnetic activity and rotation. The authors present a catalog of activity and rotation for 334 early M dwarfs.

Supernova imposters and Eta Carinae’s Great Eruption

Eta Carinae’s Great Eruption is thought to be the paradigmatic “supernova imposter.” But, using light echoes, Rest et al. find that the mechanism causing it is actually a hydrodynamic explosion and not the opaque stellar wind thought to create the other imposters observed.