Spectroscopic evidence for a large spot on the dimming Betelgeuse · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/2108.03472/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTSpectroscopic evidence for a large spot on the dimming Betelgeuse — mentioned by belterhttps://news.ycombinator.com/item?id=36083731urn:hackerpapers:mention:2108.03472:36083731Fri, 26 May 2023 13:21:31 GMT<p>From this paper : &quot;Spectroscopic evidence for a large spot on the dimming Betelgeuse&quot; - https://arxiv.org/pdf/2108.03472.pdf &quot;Evidence for a large cool spot: What could lead to a temperature drop by 170 K? It should be noted that the lowest temperature obtained on 31-01-2020, Teff = 3476 K, would be one of the coolest effective temperatures measured for a Galactic RSG... According to the stellar evolution theory, the Hayashi limit (the lower limit of Teff for stars in hydrostatic equilibrium) for a star like Betelgeuse is ∼3500 K (see, e.g., Figure 6.5 in 16). Nevertheless, the significance…</p><p><a href="https://hackerpaper.kaipfister.de/p/2108.03472/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.SR