Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994an....315..343h&link_type=abstract
Astronomische Nachrichten (ISSN 0004-6337), vol. 315, no. 5, p. 343-348
Astronomy and Astrophysics
Astronomy
8
A Stars, Magnetic Stars, Peculiar Stars, Radial Velocity, Star Clusters, Stellar Evolution, Stellar Models, Hertzsprung-Russell Diagram, Stellar Luminosity, Stellar Magnetic Fields
Scientific paper
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 alpha 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.
Hubrig Svetlana
Mathys Gautier
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