Radio Stars of the SKA
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/7/5/119 |
| _version_ | 1827694434488156160 |
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| author | Bin Yu Albert Zijlstra Biwei Jiang |
| author_facet | Bin Yu Albert Zijlstra Biwei Jiang |
| author_sort | Bin Yu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T12:04:03Z |
| format | Article |
| id | doaj.art-af6e5fd3eb714fb1986f1d49b30c75dc |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-10T12:04:03Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-af6e5fd3eb714fb1986f1d49b30c75dc2023-11-21T16:43:02ZengMDPI AGUniverse2218-19972021-04-017511910.3390/universe7050119Radio Stars of the SKABin Yu0Albert Zijlstra1Biwei Jiang2Department of Astronomy, Beijing Normal University, Beijing 100875, ChinaDepartment of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UKDepartment of Astronomy, Beijing Normal University, Beijing 100875, ChinaRadio 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.https://www.mdpi.com/2218-1997/7/5/119radio astronomyOB starsbe starsultra compact HII regionssquare kilometer arraystar evolutionary |
| spellingShingle | Bin Yu Albert Zijlstra Biwei Jiang Radio Stars of the SKA Universe radio astronomy OB stars be stars ultra compact HII regions square kilometer array star evolutionary |
| title | Radio Stars of the SKA |
| title_full | Radio Stars of the SKA |
| title_fullStr | Radio Stars of the SKA |
| title_full_unstemmed | Radio Stars of the SKA |
| title_short | Radio Stars of the SKA |
| title_sort | radio stars of the ska |
| topic | radio astronomy OB stars be stars ultra compact HII regions square kilometer array star evolutionary |
| url | https://www.mdpi.com/2218-1997/7/5/119 |
| work_keys_str_mv | AT binyu radiostarsoftheska AT albertzijlstra radiostarsoftheska AT biweijiang radiostarsoftheska |