Chemically peculiar upper main-sequence stars in the Milky Way and beyond

NETOPIL, M.; PAUNZEN, E.; MAITZEN, M.H.; PINTADO, O.I. ; ILLIENV, I.KH.

Putting A Stars into Context: Evolution, Environment, and Related Stars

: Publishing house «Pero»

Lugar: Moscu; Año: 2014; p. 10 - 18

Δa photometry is a valuable and economical tool for detecting magneticchemically peculiar stars, owing to their characteristic flux depression at 5200 Å. Ourmain focus of attention is to survey galactic open clusters in order to identify chemicallypeculiar cluster stars. Since open clusters offer the big advantage that parameters likeage or distance can be determined rather accurately, one can thence trace relationshipsbetween such parameters and other properties. On the basis of about 80 open clusterscovered so far with Δa photometry, we present a preliminary analysis that shows theevolution of magnetic chemically peculiar stars. Apart from the galactic representatives,Δa photometry has also been able to discover mCP stars in another environment: the LargeMagellanic Cloud. This nearby galaxy exhibits properties that are different from those ofthe MilkyWay, a factor which can also be invoked to investigate the conditions that favourthe formation of chemically peculiar stars.