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Δa Photometric Survey of the Small Magellanic Cloud

Published online by Cambridge University Press:  29 August 2019

M. Zejda ,
E. Paunzen  and
Z. Mikulášek
M. Zejda
Affiliation:
Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czech Republic email: zejda@physics.muni.cz
E. Paunzen
Affiliation:
Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czech Republic email: zejda@physics.muni.cz
Z. Mikulášek
Affiliation:
Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czech Republic email: zejda@physics.muni.cz
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Abstract

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The narrow-band Δa photometric system measures the flux depression at λ5200 Å by comparing the flux at the band centre to adjacent regions. It has been shown that virtually all peculiar stars with magnetic fields (mCPs) have significant positive Δa values (of up to +100 mmag), whereas Be/Ae/B[e] and metal weak stars (including lambda Bootis types) exhibit significant negative values of Δa. By using this photometric system we are therefore able to detect chemically peculiar (CP), emission types and metal-weak stars in an efficient way. The poster presented the first results of our survey of the Small Magellanic Cloud. In the selected field we found only 0.5 % of bona fide CP stars against 15 % in our Galaxy.

Keywords

Stars: chemically peculiarstars: emission-lineBegalaxies: Small Magellanic Cloudtechniques: photometric: Δa
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S339: Southern Horizons in Time-Domain Astronomy , November 2017 , pp. 349 - 352
Copyright
© International Astronomical Union 2019 

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