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The evolutionary state of magnetic Ap stars
Author(s) -
Hubrig S.,
Mathys G.
Publication year - 1994
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2103150504
Subject(s) - stars , physics , supercluster (genetic) , astrophysics , star cluster , star (game theory) , herbig ae/be star , proper motion , astronomy , cluster (spacecraft) , open cluster , k type main sequence star , t tauri star , biology , phylogenetics , genetics , computer science , gene , programming language
The characteristics of two stars, 25 Sex and HD 21699, as additional candidates for the sample of magnetic stars belonging to superclusters, are discussed. For 25 Sex, which was already accepted as a probable member of the Hyades supercluster in a previous study, arguments supporting the view that this star indeed is a magnetic star are presented. In the case of HD 21699, the radial velocity derived from our observations is not inconsistent with membership. But from the determinations of its proper motion found in the literature, this star cannot be regarded as a probable member of the α Per cluster. On the basis of recent evolutionary models, all the well established Ap cluster members appear to be close to the end of their main‐sequence life. This suggests that A stars possibly become magnetic at the end of core hydrogen burning.