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Browsing by Author "Jasniewicz, G"

Browsing by Author "Jasniewicz, G"

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  • New determination of abundances and stellar parameters for a set of weak G-band stars 
    Palacios, A; Jasniewicz, G; Masseron, T; Thevenin, F; Itam-Pasquet, J; Parthasarathy, M (EDP Sciences, 2016-03)
    Context. Weak G -band (wGb) stars are a very peculiar class of red giants; th ey are almost devoided of carbon and often present mild lithium enrichment. Desp ite their very puzzling abundance pa tterns, very few ...
  • The puzzling high velocity G5 supergiant star HD 179821: new insight from Gaia DR2 data 
    Parthasarathy, M; Jasniewicz, G; Thevenin, F (Springer, 2019-01)
    HD 179821 is classified as G5 Ia star. From the IRAS colors and spectral energy distributions it was classified as a post-AGB star. But some studies classify it as a massive (30 to 19 M⊙) post-red supergiant evolving to ...
  • Search for Lithium-Rich Stars Among G-K Giants with IR-excess 
    Jasniewicz, G; Parthasarathy, M; de Laverny, P; Thevenin, F; Mauron, N; Chadid, M (International Astronomical Union, 2000)
    We report here new results about a search for Li- rich stars among 52 G-K giant stars which are known to have near IR excess. Eleven giants have been found to have loge (Li)≥ 1.0. Five are new Li-rich stars. We suspect ...
  • 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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