For the first time, a European research team from Göttingen University discovered the remains of a nova in a galactic globular cluster. The remnant is located near the center of the globular cluster Messier 22 and was recently observed with modern instruments. The results are published in the journal Astronomy & Astrophysics .
A nova is an explosion of hydrogen on the surface of a star, which makes it much brighter. The remains form a luminous mist. "The position and brightness of the remains are consistent with an entry from 48 BC in an old collection of observations by Chinese astronomers," says the first author Fabian Göttgens of the Institute of Astrophysics of the University of Göttingen. He did this promotion. Research in the research group Stellar Astrophysics under the direction of Professor Dreizler. "You probably saw the original nova in the same place," he adds. Modern measurements thus confirm one of the oldest observations of an event outside the solar system.
Globular clusters are large, spherical clusters of several hundreds of thousands of very old stars that circle together around their home galaxy. There are 1
The newly discovered remains of the nova form a red glowing mist of hydrogen gas and other gases, which has a diameter of about 8000 times the distance between earth and sun. Despite its size, the fog is relatively light with a mass about 30 times that of the earth, as the gas was scattered by the explosion.
Image: Hubble catches a crowded cluster
Fabian Göttgens et al. Discovery of an ancient Nova remnant in the galactic globular cluster M22. Astronomy & Astrophysics (2019). DOI: 10.1051 / 0004-6361 / 201935221, Preprint: arXiv: 1904.11515: https://arxiv.org/abs/1904.11515
Astronomers discover 2000 year old rest of a nova (2019, April 30)
retrieved on April 30, 2019
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