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    stellar pulsations tagged posts

    Study of Supergiant star Betelgeuse unveils the cause of its Pulsations

    February 10, 2021, Categories  Astronomy/Space

    Recent brightness variations of Betelgeuse. Stellar pulsation causes the star’s brightness to vary, but the large dip in brightness in early 2020 is unprecedented. A comparison of direct images of the surface of Betelgeuse between January 2019 and December 2019 show that large portions of the star faded in December 2019, which could indicate a dust cloud appearing in front of it. The images were taken by the European Southern Observatory’s (ESO’s) Very Large Telescope. (Credit: ESO/M. Montargès et al.) For brightness data, see the caption of Fig 2.

    Recalibrated its mass, radius, and distance. Betelgeuse is normally one of the brightest, most recognizable stars of the winter sky, marking the left shoulder of the constellation Orion...

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    Breakthrough study of Perplexing Stellar Pulsations

    May 17, 2020, Categories  Astronomy/Space

    Sound waves bouncing around inside a star cause it to expand and contract, which results in detectable brightness changes. This animation depicts one type of Delta Scuti pulsation — called a radial mode — that is driven by waves (blue arrows) traveling between the star’s core and surface. In reality, a star may pulsate in many different modes, creating complicated patterns that enable scientists to learn about its interior.
    Credits: NASA’s Goddard Space Flight Center

    Astronomers have detected elusive pulsation patterns in dozens of young, rapidly rotating stars thanks to data from NASA’s Transiting Exoplanet Survey Satellite (TESS)...

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