Isotopic Anomalies in CP Stars: Helium, Mercury, Platinum, and Calcium
C. R. Cowley, S. Hubrig, and F. Castelli
TL;DR
This paper reviews isotopic abundance anomalies in chemically peculiar stars, focusing on calcium isotopic variations, including rare Ca-48 dominance in certain hot and magnetic stars.
Contribution
It provides a comprehensive review of isotopic anomalies in CP stars, highlighting the recent discovery of calcium-48 dominance in various stellar types.
Findings
Calcium-48 can dominate over calcium-40 in some CP stars.
Isotopic anomalies are observed in both hot, non-magnetic and cool, magnetic CP stars.
The calcium anomaly is linked to specific stellar environments and compositions.
Abstract
We review the classical observational results for isotopic abundance variations for several elements in CP stars. We concentrate on the "newest" anomaly, in calcium. The cosmically very rare isotope, Ca-48 can rival and even dominate the more common, alpha nuclide, Ca-40. Relevant examples are found in the hot, non-magnetic HgMn stars, and the field horizontal-branch star, Feige 86. The calcium anomaly is also present in cool, magnetic stars, including the notorious HD 101065, Przybylski's star.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies