Surface activity of rapidly rotating stars from simultaneous X-ray and UV observations with AstroSat

• DOI: 10.13140/rg.2.2.23617.74088
• Publication Date: 2023-10-31
• Authors: Lalitha Sairam; Utkarsh Pathak; Kulinder Pal Singh
• Keywords: Astrophysics - Solar and Stellar Astrophysics; 13. Climate action; FOS: Physical sciences; Solar and Stellar Astrophysics (astro-ph.SR)

Accepted for publication in Journal of Astrophysics and Astronomy<br/>Our study focuses on analysing the coronal, transition and chromospheric activity of four rapidly rotating stars located within 50 pc in the solar neighbourhood. We have used the multi-wavelength capabilities of AstroSat, to investigate the outer atmospheres of AB Dor, BO Mic, DG CVn and GJ 3331. These stars, classified as M and K type active stars, are known for their short rotation periods, leading to increased surface magnetic activity. Our soft X-ray observations provide the coronal properties such as emission measures, temperatures and elemental coronal abundances. We report the detection of X-ray flares from AB Dor, BO Mic, and DG CVn, while UV light curves reveal flares in both BO Mic and DG CVn.<br/>