3 papers
astro-ph.SR2025
Photospheric Helium Abundance in Cool Giants -- A Comprehensive Study
B. P. Hema, Gajendra Pandey
High-resolution optical spectra of sixteen red giants, two early asymptotic giant branch (AGB) stars, and two supergiants, having no/minimal to super lithium (Li)-rich abundances,…
astro-ph.SR2024
Detection of Enhanced Germanium in a New Cool Extreme Helium Star A 980: Insights and Implications
Ajay Kumar Saini, Gajendra Pandey
A fine abundance analysis of a recently discovered hydrogen-deficient carbon (HdC) star, A 980, is presented. Based on the observed high-resolution optical spectrum, we ascertain t…
astro-ph.SR2024
Helium Abundance of the Sun: A Spectroscopic Analysis
Satyajeet Moharana, B. P. Hema, Gajendra Pandey
Determining the He/H ratio in cool stars presents a fundamental astrophysical challenge. While this ratio is established for hot O and B stars, its extrapolation to cool stars rema…