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

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Abstract

Our study focuses on analysing the coronal, transition and chromospheric activity of four rapidly rotating stars located within 50 pc in the solar neighborhood. 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 reported 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.

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Notes

  1. http://www.tifr.res.in/~astrosat_sxt/index.html.

  2. http://www.atomdb.org.

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Acknowledgements

This publication uses the data from the AstroSat mission of the Indian Space Research Organization (ISRO). These sources were observed as part of both the SXT guaranteed time program and AO. In particular, the data used were observed from the Soft X-ray Telescope (SXT) developed at TIFR, Mumbai. We thank the SXT and UVIT payload operation center for verifying and releasing the data via the ISSDC data archive and providing the necessary software tools. This work has also made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC) (https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia Multilateral Agreement. The work has also made use of software, and/or web tools obtained from NASA’s High Energy Astrophysics Science Archive Research Center (HEASARC), a service of the Goddard Space Flight Center and the Smithsonian Astrophysical Observatory. K. P. Singh thanks the Indian National Science Academy for support under the INSA Senior Scientist Program.

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Authors and Affiliations

  1. School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    Lalitha Sairam

  2. Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India

    Utkarsh Pathak

  3. Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, SAS Nagar, Manauli, 140306, India

    Utkarsh Pathak & Kulinder Pal Singh

  4. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India

    Kulinder Pal Singh

Authors
  1. Lalitha Sairam
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  2. Utkarsh Pathak
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  3. Kulinder Pal Singh
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Correspondence to Lalitha Sairam.

Appendix: Details of spectral modeling

Appendix: Details of spectral modeling

See Table 5.

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Sairam, L., Pathak, U. & Singh, K.P. Surface activity of rapidly rotating stars from simultaneous X-ray and UV observations with AstroSat. J Astrophys Astron 44, 90 (2023). https://doi.org/10.1007/s12036-023-09975-3

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