Spectroscopic evidence for a large spot on the dimming Betelgeuse View Full Text


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Article Info

DATE

2021-08-05

AUTHORS

Sofya Alexeeva, Gang Zhao, Dong-Yang Gao, Junju Du, Aigen Li, Kai Li, Shaoming Hu

ABSTRACT

During October 2019 and March 2020, the luminous red supergiant Betelgeuse demonstrated an unusually deep minimum of its brightness. It became fainter by more than one magnitude and this is the most significant dimming observed in the recent decades. While the reason for the dimming is debated, pre-phase of supernova explosion, obscuring dust, or changes in the photosphere of the star were suggested scenarios. Here, we present spectroscopic studies of Betelgeuse using high-resolution and high signal-to-noise ratio near-infrared spectra obtained at Weihai Observatory on four epochs in 2020 covering the phases of during and after dimming. We show that the dimming episode is caused by the dropping of its effective temperature by at least 170 K on 2020 January 31, that can be attributed to the emergence of a large dark spot on the surface of the star. More... »

PAGES

4719

References to SciGraph publications

  • 2009-05-02. Starspots in THE ASTRONOMY AND ASTROPHYSICS REVIEW
  • 2014-07-15. Non-LTE sodium abundance in galactic thick- and thin-disk red giants in ASTRONOMY LETTERS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/s41467-021-25018-3

    DOI

    http://dx.doi.org/10.1038/s41467-021-25018-3

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1140212296

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/34354072


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