The 21st Cambridge workshop on Cool Stars, Stellar Systems, and the Sun
Published January 31, 2023 | Version v1
Conference paper Open

Betelgeuse: Long Secondary Period, a Fundamental Mode and Overtones

Authors/Creators

  • 1. AIP
  • 2. Harvard-Smithsonian Center for Astrophysics

Contributors

Description

Betelgeuse is the brightest Red Supergiant (RSG) in the sky and thus has been studied over decades. Photometrically, a funda-
mental pulsation mode (FM) at a period P ≈400 d and a long, secondary period (LSP) with still disputed origin at P ≈2400 d have
been found. The Leibniz Institute for Astrophysics Potsdam (AIP) monitors Betelgeuse almost nightly since more than a decade
with its robotic spectroscopic telescope STELLA, collecting R≈55000 spectra covering wavelength ranges from 390-860 nm.
This proceeding reports about radial-velocity data, periods found within and their connection to photometric measurements.

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