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Browsing IIAP Publications by Author "Bhattacharyya, Suman"

Browsing IIAP Publications by Author "Bhattacharyya, Suman"

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  • Decoding the X-Ray Flare from MAXI J0709–159 Using Optical Spectroscopy and Multiepoch Photometry 
    Bhattacharyya, Suman; Mathew, Blesson; Ezhikode, Savithri H; Muneer, S; Selvakumar, G; Maheswar, G; Arun, R; Anilkumar, Hema; Banerjee, Gourav; Kumar, S. P; Kartha, Sreeja S; Paul, KT; Velu, C (IOP Publishing, 2022-07-10)
    We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/Gas Slit Camera observations in soft and hard X-rays from MAXI J0709–159 in the direction of HD 54786 (LY CMa), on 2022 January 25. ...
  • Optical Spectroscopy of Classical Be Stars in Old Open Clusters 
    Jagadeesh, Madhu Kashyap; Mathew, Blesson; Paul, K. T; Banerjee, Gourav; Bhattacharyya, Suman; Anusha, R; Pramod Kumar, S (IOP Publishing, 2023-03)
    We performed the optical spectroscopy of 16 classical Be stars in 11 open clusters older than 100 Myr. Ours is the first spectroscopic study of classical Be stars in open clusters older than 100 Myr. We found that the Hα ...
  • Study of transient nature of classical Be stars using multi-epoch optical spectroscopy 
    Banerjee, Gourav; Mathew, Blesson; Paul, K. T; Subramaniam, A; Balan, Anjusha; Bhattacharyya, Suman; Anusha, R; Moosa, Deeja; Dheeraj, C. S.; Charly, Aleeda; Raghu, Megha (Indian Academy of Sciences, 2022-12)
    Variability is a commonly observed property of classical Be stars (CBe) stars. In extreme cases, complete disappearance of the Hα emission line occurs, indicating a disc-less state in CBe stars. The disc-loss and reappearing ...

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