Delta a Photometric survey of the small magellanic cloud

• Autoři: ZEJDA Miloslav; PAUNZEN Ernst; MIKULÁŠEK Zdeněk
• Rok publikování: 2019
• Druh: Článek ve sborníku
• Konference: Symposium S339 (Southern Horizons in Time-Domain Astronomy)
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• www: https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/photometric-survey-of-the-small-magellanic-cloud/489C1CF7F548C8BD7718196AE027BF49
• Doi: http://dx.doi.org/10.1017/S1743921318002995
• Klíčová slova: Stars: chemically peculiar; stars: emission-line; Be; galaxies: Small Magellanic Cloud; techniques: photometric: Detla a
• Popis: The narrow-band delta a photometric system measures the flux depression at lambda 5200 angstrom 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 delta a values (of up to +100 mmag), whereas Be/Ae/B[e] and metal weak stars (including lambda Bootis types) exhibit significant negative values of delta a. 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.

Související projekty

• F. Magellanes: projekt podpory studia hvězd a hvězdných soustav na základě pozorování ze Země a z kosmického prostoru
• Atmosféry a okolohvězdné prostředí magnetických horkých hvězd