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      https://www.ias.ac.in/article/fulltext/joaa/023/01-02/0009-0014

    • Keywords

       

      Stars; variable, optical photometry, X-rays; source

    • Abstract

       

      We present photometric observations of four stars that are optical counterparts of soft X-ray/EUV sources, namely 1ES 0829+15.9, 1ES0920-13.6, 2RE J1 10159+223509 and 1ES 1737+61.2. We have discovered periodic variability in two of the stars, viz., MCC 527 (1ES 0829+15.9; Period = 0d.828 ± 0.0047) and HD 81032 (1ES 0920-13.6; Period = ∼ 57.02 ± 0.560 days). HD 95559 (2RE J1 10159+223509) is found to show a period of 3d. HD 160934 (1ES1737+61.2) also shows photometric variability but needs to be monitored further for finding its period. These stars most likely belong to the class of chromospherically active stars.

    • Author Affiliations

       

      J. C. Pandey1 K. P. Singh2 R. Sagar1 3 S. A. Drake4

      1. State Observatory, Naini Tal - 263 129, India
      2. Tata Institute of Fundamental Research, Mumbai, India
      3. Indian Institute of Astrophysics, Bangalore, India
      4. Code 668, LHEA, NASA/Goddaard Space Flight Center, Greenbelt, MD - 20771, USA
    • Dates

       
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