This tag is associated with 10 posts

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.

A New Pulsating, Magnetic, Carbon Atmosphere White Dwarf

The authors present the discovery of a new hot carbon-atmosphere white dwarf with a strong magnetic field. This discovery might help illuminate the origins of a recently found class of white dwarfs.

The galaxy’s red giant bones

“Galactic archaeology” is the term that has come to refer to using the motions and chemical compositions of stars of different ages to learn about the history of the Milky Way. It seems to me that “galactic paleontology” might be a bit more accurate. I hope to see galactic archaeology v. galactic paleontology fought out in the comments!

Convection in the Sun is Slower than We Thought

In the sun, subsurface flows are 20-100 times slower than what is predicted in widely used theoretical models.

The discovery of pulsations in the white dwarf J1840: the first of its kind

Title:  SDSS J184037.78+642312.3: The First Pulsating Extremely Low Mass White Dwarf Authors: J. J. Hermes, M. H. Montgomery, D. E. Winget, Warren R. Brown, Mukremin Kilic, Scott J. Kenyon First Author’s Institution: UT Austin, TX 97% of all stars — those with initial masses less than about 8 solar masses — end their lives as […]

Finding the Helium Flash

Just as seismologists determine the structure of the Earth through surface vibrations, so asteroseismologists do the same for stars

Investigating stars like our Sun using asteroseismology

If there’s one type of star you’d think astronomers would know a lot about, it’s probably solar-type stars. After all, humans have been staring at our very near neighbor for millennia and in the recent century have dedicated entire space missions to studying this archetype. But there is always more to be learned and new tools like asteroseismology continue to open up avenues of study previously closed.

Quakes on Jupiter: a new look at a familiar object

In this paper, techniques from helioseismology – using waves to learn about the interior of the Sun – are applied to yet another object: Jupiter. Because Jupiter is largely a fluid, like the Sun, astronomers have expected it to show global seismic behavior since the mid-1970s; the signal was even theorized to be about the same magnitude as solar oscillations. However, attempts to detect Jupiter’s global oscillations in the 80s and 90s were largely unsuccessful.

AAS #218: Boston or bust

Over the past three and a half days, I joined astronomers from all over the world for the 218th meeting of the American Astronomical Society. The AAS holds two major meetings every year, one in the winter and one in the summer. This year’s summer conference in Boston just wrapped up and in this astrobite I’ll report on two of the talks I attended.

Starquakes in Red Giants

Previously, it was impossible to find out the inner source behind a red giant’s light – hydrogen fusion in a shell, or helium fusion in the core? Using Kepler, the authors of this paper show how to do this observationally using asteroseismology.

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