Partha Pratim Goswami

Chemical analysis of CH stars

Meenakshi Purandardas, Aruna Goswami, Partha Pratim Goswami, J. Shejeelammal et autres

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Spectroscopic study of Ba and CEMP-s stars

Partha Pratim Goswami, Aruna Goswami

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Three extremely metal-poor stars: discovery of a new CEMP-no star

Partha Pratim Goswami, Aruna Goswami

ABSTRACT We have conducted detailed high-resolution spectroscopic studies on three extremely metal-poor (EMP) stars HE 0401–0138, HE 1153–0518, and HE 1246–1344. For the stars HE 0401–0138 and HE 1246–1344, we have estimated the abundances of C, Na, Mg, Ca, Sc, Ti, Cr, …

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Three Extremely Metal-Poor stars: discovery of a new CEMP-no star

Partha Pratim Goswami, Aruna Goswami

We have conducted detailed high-resolution spectroscopic studies on three extremely metal-poor (EMP) stars HE 0401-0138, HE 1153-0518 and HE 1246-1344. For the stars HE 0401-0138 and HE 1246-1344, we have estimated the abundances of C, Na, Mg, Ca, Sc, Ti, Cr, Mn, …

Three Extremely Metal-Poor stars: discovery of a new CEMP-no star

Partha Pratim Goswami, Aruna Goswami

We have conducted detailed high-resolution spectroscopic studies on three extremely metal-poor (EMP) stars HE 0401-0138, HE 1153-0518 and HE 1246-1344. For the stars HE 0401-0138 and HE 1246-1344, we have estimated the abundances of C, Na, Mg, Ca, Sc, Ti, Cr, Mn, …

in (code pays fourni par la source)

High-precision K2/TESS photometry and HERMES spectroscopy of four bright field stars

Otto Trust, Santosh Joshi, Benard Nsamba, Sharon Aol et autres

ABSTRACT Space-based photometry from K2 and TESS, coupled with high-resolution spectroscopy, provides a unique opportunity to re-examine the variability and chemical nature of four bright stars (HD 73135, BD +19$^\circ$ 2045, BD +19$^\circ$ 2046, and TYC 1395-855-1), which were poorly characterized by …

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Constraining Neutron-Capture Nucleosynthesis from Surface Chemical Composition of Chemically Peculiar Stars: The Puzzling Case of HE 1005-1439

Aruna Goswami, A. Choplin, Partha Pratim Goswami, L. Siess et autres

The chemical composition of stellar atmospheres provides a valuable window into the complex processes of stellar nucleosynthesis. Among chemically peculiar cool stars, many objects are the products of mass transfer in binary systems, including most carbon stars, CH stars, and CEMP-s and …

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Asteroseismology of HD 23734, HD 68703, and HD 73345 using K2–TESS space-based photometry and high-resolution spectroscopy

Santosh Joshi, Athul Dileep, Е. А. Семенко, Mrinmoy Sarkar et autres

ABSTRACT In this paper, we present a comprehensive study of three stars, HD 23734, HD 68703, and HD 73345, which were previously observed as chemically peculiar candidates within the Nainital-Cape survey and reported as null results for the pulsational variability. Frequency analyses …

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Asteroseismology of HD 23734, HD 68703, and HD 73345 using K2-TESS Space-based Photometry and High-resolution Spectroscopy

Santosh Joshi, Athul Dileep, Е. А. Семенко, Mrinmoy Sarkar et autres

In this paper, we present a comprehensive study of three stars, HD 23734, HD 68703, and HD 73345, which were previously observed as chemically peculiar candidates within the Nainital-Cape survey and reported as null results for the pulsational variability. Frequency analyses of …

Formation Scenarios of Ba Stars: New Evidence from the Masses of the Companion AGBs

Partha Pratim Goswami, Aruna Goswami

The abundances of the slow neutron-capture (s-) process elements observed in barium stars can be explained by considering mass transfer in a binary system from an asymptotic giant branch (AGB) star onto a smaller mass and less evolved binary companion star. Based …

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On the potential of Carbon-Enhanced Metal-poor Stars for Galactic Archaeology

Aruna Goswami, J. Shejeelammal, Partha Pratim Goswami, Meenakshi Purandardas

The low-mass metal-poor stars in the Galaxy that preserve in their atmosphere, the chemical imprints of the gas clouds from which they were formed can be used as probes to get insight into the origin and evolution of elements in the early …

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CEMP (s- and r/s) stars: s- and i-process and implications for Galactic chemical evolution

Aruna Goswami, Partha Pratim Goswami, J. Shejeelammal, Meenakshi Purandardas

Abstract Low-mass and low-metallicity Aymptotic Giant Branch (AGB) stars contribute to the chemical evolution of heavy elements through slow (s) and intermediate (i) neutron-capture processes. During AGB stars evolution the i-process occur when protons are mixed in a convective helium burning zone …

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