An extensive Δa-photometric survey of southern B and A type bright stars

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dc.contributor.authorVogt, N
dc.contributor.authorKerschbaum, F
dc.contributor.authorMaitzen, HM
dc.contributor.authorFaundez-Abans, M
dc.date.accessioned2025-01-21T01:32:39Z
dc.date.available2025-01-21T01:32:39Z
dc.date.issued1998
dc.description.abstractPhotoelectric photometry of 803 southern BS objects in the aa-system as detection tool for magnetic chemically peculiar (=CP2) stars has been carried out and compared to published spectral types. The statistical yield of such objects detected by both techniques is practically the same. We show that there are several factors which contaminate the search for these stars, but this contamination is only of the order of 10% in both techniques. We find a smooth transition from normal to peculiar stars.
dc.description.abstractOur sample exhibits the largest fraction of CP2 stars at their bluest colour interval, i.e. 10% of all stars in the colour range -0.19 less than or equal to B - Sr < -0.10 or -0.10 less than or equal to b - y < -0.05. No peculiar stars based on the aa-criterion were found at bluer colours. Towards the red side the fraction of CP2 stars drops to about 3% for positive values of B - Sr or b - y with red limits roughly corresponding to normal stars of spectral type A5.
dc.description.abstractThe photometric behaviour of other peculiar stars: Am, HgMn, delta Del, lambda Boo, He abnormal stars, as well as Be/shell stars and supergiants shows some slight, but definite deviations from normal stars. Spectroscopic and visual binaries are not distinguished from normal stars in their aa behaviour.
dc.description.abstractThe results of this work justify larger statistical work (e.g. in open clusters) employing more time-saving photometric methods (CCD).
dc.fuente.origenWOS
dc.identifier.issn0365-0138
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97298
dc.identifier.wosidWOS:000074292200007
dc.issue.numero3
dc.language.isoen
dc.pagina.final464
dc.pagina.inicio455
dc.revistaAstronomy & astrophysics supplement series
dc.rightsacceso restringido
dc.subjecttechniques, photometric
dc.subjectstars, chemically peculiar
dc.subjectcatalogues
dc.titleAn extensive Δa-photometric survey of southern B and A type bright stars
dc.typeartículo
dc.volumen130
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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