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Article

Radio Stars of the SKA

by 1,2, 2,* and 1
1
Department of Astronomy, Beijing Normal University, Beijing 100875, China
2
Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Roberto Mignani
Universe 2021, 7(5), 119; https://doi.org/10.3390/universe7050119
Received: 19 March 2021 / Revised: 13 April 2021 / Accepted: 20 April 2021 / Published: 22 April 2021
(This article belongs to the Special Issue Stellar Astrophysics)
Radio emission from stars can be used, for example, to study ionized winds or stellar flares. The radio emission is faint and studies have been limited to few objects. The Square Kilometer Array (SKA) brings a survey ability to the topic of radio stars. In this paper we investigate what the SKA can detect, and what sensitivity will be required for deep surveys of the stellar Milky Way. We focus on the radio emission from OB stars, Be stars, flares from M dwarfs, and Ultra Compact HII regions. The stellar distribution in the Milky Way is simulated using the Besançon model, and various relations are used to predict their radio flux. We find that the full SKA will easily detect all UltraCompact HII regions. At the limit of 10 nJy at 5 GHz, the SKA can detect 1500 Be stars and 50 OB stars per square degree, out to several kpc. It can also detect flares from 4500 M dwarfs per square degree. At 100 nJy, the numbers become about 8 times smaller. SKA surveys of the Galactic plane should be designed for high sensitivity. Deep imaging should consider the significant number of faint flares in the field, even outside the plane of the Milky Way. View Full-Text
Keywords: radio astronomy; OB stars; be stars; ultra compact HII regions; square kilometer array; star evolutionary; galaxy radio astronomy; OB stars; be stars; ultra compact HII regions; square kilometer array; star evolutionary; galaxy
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MDPI and ACS Style

Yu, B.; Zijlstra, A.; Jiang, B. Radio Stars of the SKA. Universe 2021, 7, 119. https://doi.org/10.3390/universe7050119

AMA Style

Yu B, Zijlstra A, Jiang B. Radio Stars of the SKA. Universe. 2021; 7(5):119. https://doi.org/10.3390/universe7050119

Chicago/Turabian Style

Yu, Bin, Albert Zijlstra, and Biwei Jiang. 2021. "Radio Stars of the SKA" Universe 7, no. 5: 119. https://doi.org/10.3390/universe7050119

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