https://phys.org/ en-us Latest news from Royal Observatory of Belgium A recent five-year study has uncovered new insights into the properties of yellow hypergiants, a heavy star class known for their dramatic outbursts. Scientists focused on Rho Cassiopeiae (Rho Cas), HR 8752, and HR 5171A, revealing that Rho Cas exhibits cyclical outbursts every 10 to 40 years, with large fluctuations of its surface temperature. https://phys.org/news/2025-02-rho-cas-kin-insights-mysterious.html Astronomy Mon, 17 Feb 2025 16:11:04 EST news659031061 A joint scientific team led by the Royal Observatory of Belgium (ROB) and the KU Leuven has found that high-frequency magnetic waves could play an essential role in keeping the sun's atmosphere at millions of degrees. This finding sheds a new light on the most intriguing solar mystery: what makes the sun's atmosphere hotter than its surface? https://phys.org/news/2023-07-astronomers-high-frequency-magnetic-play-essential.html Astronomy Fri, 28 Jul 2023 10:12:58 EDT news609757975 An international team of professional and amateur astronomers, which includes Alex Lobel, astronomer at the Royal Observatory of Belgium, has determined in detail how the temperature of four yellow hypergiants increases from 4000 degrees to 8000 degrees and back again in a few decades. They will publish their findings in the professional journal Astronomy & Astrophysics. https://phys.org/news/2019-10-astronomers-supergiant-stars-repeatedly-cool.html Astronomy Thu, 10 Oct 2019 10:48:39 EDT news489923314