Open AccessAbundance analysis of the cool extreme helium star LSS 3378
Author(s) -
Pandey Gajendra,
Reddy Bacham E.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10398.x
Subject(s) - physics , metallicity , stars , astrophysics , abundance (ecology) , nucleosynthesis , abundance of the chemical elements , helium , stellar atmosphere , astronomy , effective temperature , stellar evolution , line (geometry) , atomic physics , fishery , biology , geometry , mathematics
Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is presented. The abundance analysis is done using local thermodynamic equilibrium (LTE) line formation and LTE model atmospheres constructed for EHe stars. The atmosphere of LSS 3378 shows evidence of H‐burning, He‐burning, and s ‐process nucleosynthesis. The derived abundances of iron peak and α‐elements indicate the absence of selective fractionation or any other processes that can distort chemical composition of these elements. Hence, the Fe abundance [log ε(Fe) = 6.1] is adopted as an initial metallicity indicator. The measured abundances of LSS 3378 are compared with those of R Coronae Borealis (RCB) stars and with rest of the EHe stars as a group.