Stars

Definition

Stars are large balls of plasma, predominantly hydrogen and helium. The birth, evolution and death of stars are of particular research interest. Other important topics include understanding the internal processes, such as fusion, that generate great quantities of radiation and the gravitational interactions between stars.

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Latest Research and Reviews

  • Research |

    M dwarfs harbour stellar dynamos driven by convective motions in their interiors. Previously, the magnetic field strengths generated by these dynamos were thought to saturate at 4 kG, but this limit has now been busted by four stars with dipole dynamo states.

    • D. Shulyak
    • , A. Reiners
    • , A. Engeln
    • , L. Malo
    • , R. Yadav
    • , J. Morin
    •  & O. Kochukhov
  • Research |

    Some star clusters in the Large Magellanic Cloud have extended main-sequence turnoffs, suggesting that the component stars have different ages. However, if the blue main-sequence stars were initially spinning rapidly, and experienced braking, the apparent age difference disappears.

    • Francesca D’Antona
    • , Antonino P. Milone
    • , Marco Tailo
    • , Paolo Ventura
    • , Enrico Vesperini
    •  & Marcella Di Criscienzo
  • Research |

    Multiple stars are thought to form either through disk fragmentation or turbulent fragmentation, but the latter has had no clear observational confirmation. Here the authors report misaligned disks around a wide-binary pair, a sign of turbulent fragmentation.

    • Jeong-Eun Lee
    • , Seokho Lee
    • , Michael M. Dunham
    • , Ken’ichi Tatematsu
    • , Minho Choi
    • , Edwin A. Bergin
    •  & Neal J. Evans
  • Research |

    A previously unidentified class of variable stars has been found in OGLE survey data, characterized by periodic brightness variations on ~30-min timescales, amplitudes of ~0.3 mag and temperatures of ~30,000 K. They are potentially evolved low-mass stars.

    • Paweł Pietrukowicz
    • , Wojciech A. Dziembowski
    • , Marilyn Latour
    • , Rodolfo Angeloni
    • , Radosław Poleski
    • , Francesco di Mille
    • , Igor Soszyński
    • , Andrzej Udalski
    • , Michał K. Szymański
    • , Łukasz Wyrzykowski
    • , Szymon Kozłowski
    • , Jan Skowron
    • , Dorota Skowron
    • , Przemek Mróz
    • , Michał Pawlak
    •  & Krzysztof Ulaczyk
  • Research |

    Combining studies of star formation rates with studies of cloud–magnetic field alignment has revealed that magnetic fields are a primary regulator of star formation. Perpendicular alignment inhibits star formation, whereas parallel alignment facilitates it.

    • Hua-bai Li
    • , Hangjin Jiang
    • , Xiaodan Fan
    • , Qilao Gu
    •  & Yapeng Zhang

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