Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-14
Astrophys.J. 602 (2004) L113-L116
Astronomy and Astrophysics
Astrophysics
4 pages (embedded figure and table), accepted for publication in ApJ Letters
Scientific paper
10.1086/382684
Analysis of HST STIS ultraviolet spectra of two hot extreme helium stars (EHes): V1920 Cyg and HD 124448 provide the first measurements of abundances of neutron-capture elements for EHes. Although the two stars have similar abundances for elements up through the iron-group, they differ strikingly in their abundances of heavier elements: V1920 Cyg is enriched by a factor of 30 in light neutron-capture elements (Y/Fe, Zr/Fe) relative to HD 124448. These differences in abundances of neutron-capture elements among EHes mirrors that exhibited by the RCrB stars, and is evidence supporting the view that there is an evolutionary connection between these two groups of hydrogen-deficient stars. Also, the abundances of Y and Zr in V1920 Cyg provide evidence that at least one EHe star went through a s-process synthesis episode in its earlier evolution.
Jeffery Simon C.
Kameswara Rao N.
Lambert David L.
Pandey Gajendra
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