Using the Canada-France-Hawaii Telescope. Canada France Hawaii Telescope (CFHT) astronomers have chemically observed
The team of astronomers was led by Gauthier Mathis of the European Southern Observatory (ESO) in Chile.They observed HD 213258 with the ESPaDOnS spectrograph at CFHT, which gave them more insight into the nature of the object."The star we recently identified has a unique combination of rare and remarkable properties," they writeresearchers in the article.
The observations showed that the average modulus of the magnetic field of HD 213258 is about 3.8 kGs (without significant changes over the observation period of two years). This means that HD 213258 is a strongly magnetic Ap star.
Part of the spectrum of HD 213258. Credit & Copyright: Mathis et al., 2022
Astronomers have calculated that the stellar rotation period of HD 213258 is about 50 years, which makesone of the slowest spinning Ap stars known to date. This star was also found to oscillate rapidly, exhibiting high overtone pulsations with a period of approximately 7.58 minutes. The researchers classified HD 213258 as a roAp — a rapidly oscillating Ap star.
HD 213258 (also known as BD 35 4815) is located about 363 light-years from Earth (close in cosmic terms) in the constellation Lacerta, and representsIt is estimated to be about 2.4 times the size of the Sun.The absolute magnitude of the star is 2.39 magnitude, and its effective temperature is estimated to be between 7,500 and 10,000 K (7,226.85 –9726.85 °C).
Chemically peculiarChemically peculiar (CP) stars are objects with unusual metal contents, so certain elements are characterized by strong or weak spectral lines. Some CP stars have stronger magnetic fields than classical A- or B-type stars and are therefore known as magnetic chemically peculiar (mCP) stars (Ap and BP stars). Astronomers consider this class of stars to be a natural atomic and magnetic laboratory for studying star formation and evolution.
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On the cover: an artist's impression of a magnetar, image courtesy of ESA, Christophe Carreau