Poster Open Access

The Curious Case of Betelgeuse

Granzer, Thomas; Weber, Michael; Strassmeier, Klaus G.; Dupree, Andrea

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Granzer, Thomas</dc:creator>
  <dc:creator>Weber, Michael</dc:creator>
  <dc:creator>Strassmeier, Klaus G.</dc:creator>
  <dc:creator>Dupree, Andrea</dc:creator>
  <dc:description>Since more than a decade, the AIP is monitoring \(\alpha\) Ori with its robotic spectroscopic facility STELLA/SES in Teide observatory, Tenerife along with its automated photoelectric telescope T7 in Fairborn observatory, Az. Additionally, we got access with exclusive two-band photometric data on Betelgeuse from the BRITE satellite consortium, covering the last seven seasons. In late 2019, Betelgeuse showed a rapid brightness decline, reaching an all-time low in Feb. 2020, followed by a quick re-brightening. This poster  shows radial velocity data together with the photometry. The radial velocity follows the photometry in general, but sometimes shows a time-shift, which was particularly visible in the grand dimming event. Interesting is the time-frequency analysis of the different data set: All three show similar features at split-periods around the known P=420d.</dc:description>
  <dc:subject>Post main sequence cool stars</dc:subject>
  <dc:title>The Curious Case of Betelgeuse</dc:title>
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