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Browsing by Author "Ninan, Joe P"

Browsing by Author "Ninan, Joe P"

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  • The Active Chromospheres of Lithium-rich Red Giant Stars* 
    Sneden, Christopher; Afsar, Melike; Bozkurt, Zeynep; Adamow, Monika; Mallick, Anohita; Reddy, B. E; Janowiecki, Steven; Mahadevan, Suvrath; Bowler, Brendan P; Hawkins, Keith; Lind, Karin; Dupree, Andrea K; Ninan, Joe P; Nagarajan, Neel; Topcu, Gamze Bocek; Froning, Cynthia S; Bender, Chad F; Terrien, Ryan; Ramsey, Lawrence W; Mace, Gregory N (American Astronomical Society, 2022-11-20)
    We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their He I λ10830 absorption strengths. This transition is an indicator ...
  • Gaia 20eae: A Newly Discovered Episodically Accreting Young Star 
    Ghosh, Arpan; Sharma, Saurabh; Ninan, Joe P; Ojha, Devendra K; Bhatt, B. C; Kanodia, Shubham; Mahadevan, Suvrath; Stefansson, Gudmundur; Yadav, R. K; Gour, A. S; Pandey, Rakesh; Sinha, Tirthendu; Panwar, Neelam; Wisniewski, John P; Canas, Caleb I; Lin, Andrea S. J; Roy, Arpita; Hearty, Fred; Ramsey, Lawrence; Robertson, Paul; Schwab, Christian (American Astronomical Society, 2022-02-10)
    The Gaia Alert System issued an alert on 2020 August 28, on Gaia 20eae when its light curve showed a ∼4.25 magnitude outburst. We present multiwavelength photometric and spectroscopic follow-up observations of this source ...
  • Oxygen abundances of carbon-enhanced stellar population in the halo 
    Susmitha, A; Sivarani, T; Ojha, D. K; Ninan, Joe P; Bandyopadhyay, A; Surya, A; Athira, U (Springer, 2020-12)
    The large fraction of carbon-enhanced metal-poor (CEMP) stars at lower metallicities makes them an interesting class of objects to be probed further in greater detail. They show different abundance patterns of neutron-capture ...
  • Post-outburst Evolution of Bona Fide FU Ori-type V2493 Cygnus: A Spectro-photometric Monitoring 
    Ghosh, Arpan; Sharma, Saurabh; Ninan, Joe P; Ojha, Devendra K; Bhatt, B. C; Sahu, D. K; Baug, Tapas; Yadav, R. K; Irawati, Puji; Gour, A. S; Panwar, Neelam; Pandey, Rakesh; Sinha, Tirthendu; Verma, Aayushi (American Astronomical Society, 2023-09-01)
    We present here the results of 8 yr of our near-simultaneous optical–near-infrared spectro-photometric monitoring of the bona fide FU Ori (FUor)-type candidate V2493 Cygnus (V2493 Cyg) starting from 2013 September to 2021 ...

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