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Browsing by Author "Bharat Kumar, Y"

Browsing by Author "Bharat Kumar, Y"

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  • HD 77361: a new case of super Li-rich K giant with anomalous low C-12/C-13 ratio 
    Bharat Kumar, Y; Reddy, B. E (The American Astronomical Society, 2009-09)
    Results from high-resolution spectroscopic analysis of HD77361 are reported. LTE analysis shows that HD77361 is a K giant of atmospheric parameters: T-eff = 4580 +/- 75 K, log g = 2.5 +/- 0.1, and xi(t) = 1.40 +/- 0.5 km ...
  • Identifying Li-rich giants from low-resolution spectroscopic survey 
    Bharat Kumar, Y; Reddy, B. E; Zhao, G (Indian Academy of Sciences, 2018-04)
    In this paper we discuss our choice of a large unbiased sample used for the survey of red giant branch stars for finding Li-rich K giants, and the method used for identifying Li-rich candidates using low-resolution spectra. ...
  • A large sample of newly identified carbon-deficient red giants from APOGEE 
    Maben, Sunayana; Bharat Kumar, Y; Reddy, B. E; Campbell, Simon W; Zhao, Gang (Oxford University Press on behalf of Royal Astronomical Society, 2023-11)
    Based on the Apache Point Observatory Galactic Evolution Experiment survey we conducted a search for carbon-deficient red giants (CDGs). We found 103 new CDGs, increasing the number in the literature by more than a factor ...
  • Origin of Lithium Enrichment in K Giants 
    Bharat Kumar, Y; Reddy, B. E; Lambert, D. L (Institute of Physics Publishing, 2011-03-20)
    In this Letter, we report on a low-resolution spectroscopic survey for Li-rich K giants among 2000 low-mass (M ≤ 3 M sun) giants spanning the luminosity range from below to above the luminosity of the clump. Fifteen new ...
  • Spectroscopic study of two new super Li-rich red clump K giants 
    Raghubar, Singh; Reddy, B. E; Bharat Kumar, Y (Oxford University Press on behalf of the Royal Astronomical Society, 2019-01)
    In this paper, we report the discovery of two new super Li-rich K giants: HD 24960 and TYC 1751-1713-1. Based on high-resolution (R ≈ 60 000) spectroscopy, we have derived Li abundance of A(Li) ≈ 4.0 dex for both ...
  • Study of Li-rich K Giants 
    Bharat Kumar, Y (Indian Institute of Astrophysics, 2011-08)
  • Survey for Li-rich K giants 
    Bharat Kumar, Y; Reddy, B. E (Cambridge University Press, 2010-04)
    We present results from an ongoing survey of searching Li-rich K giants among low mass giants along the Red Giant Branch (RGB). A sample of 2500 stars with accurate astrometry have been selected from Hipparcos catalogue ...
  • Survey of Li-rich giants among Kepler and LAMOST fields: determination of Li-rich giants' evolutionary phase 
    Raghubar Singh; Reddy, B. E; Bharat Kumar, Y; Antia, H. M (IOP Publishing, 2019-06-10)
    In this Letter, we report the discovery of 24 new super Li-rich (A(Li) ≥ 3.2) giants of He-core burning phase at the red clump region. Results are based on a systematic search of a large sample of about 12,500 giants common ...
  • Tracking the evolution of Lithium in giants using asteroseismology: super-Li-rich stars are almost exclusively young red-clump stars 
    Raghubar Singh; Reddy, B. E; Campbell, S. W; Bharat Kumar, Y; Vrard, Mathieu (IOP Publishing, 2021-05-20)
    We report novel observational evidence on the evolutionary status of lithium-rich giant stars by combining asteroseismic and lithium abundance data. Comparing observations and models of the asteroseismic gravity-mode period ...
  • Two New Super Li-rich Core He-burning Giants: A New Twist to the Long Tale of Li Enhancement in K Giants 
    Bharat Kumar, Y; Singh, R; Reddy, B. E; Zhao, G (IOP Publishing, 2018-05-10)
    In this Letter we report two new super Li-rich K giants, KIC2305930 and KIC12645107, with Li abundances exceeding that of the interstellar medium (ISM; A(Li) ≥ 3.2 dex). Importantly, both of the giants have been classified ...
  • Weak G-band stars on the H-R diagram: clues to the origin of the Li anomaly 
    Palacios, A; Parthasarathy, M; Bharat Kumar, Y; Jasniewicz, G (EDP Sciences, 2012-02)
    Aims. Weak G-band (WGB) stars are a rare class of cool luminous stars that present a strong depletion in carbon, but also lithium abundance anomalies that have been little explored in the literature since the first discovery ...

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