The nature of light variations in magnetic hot stars

Autor(en)

J. Krtička, L. Huang, M. Jagelka, T. Lüftinger, Z. Mikulášek, E. Niemczura, M. Prvák, J. Silvester, G. Wade

Abstrakt

Magnetic stars show several types of light variability which is modulated by the stellar rotation. In chemically peculiar stars, the redistribution of the flux in the surface regions with peculiar chemical composition leads to the light variability with a typical amplitude of the order of hundredths of magnitude. The most efficient processes that cause the flux redistribution are bound-bound (line) transitions of iron and bound-free (ionization) transitions of silicon. This type of light variability typically leads to a complex dependence of the amplitude on the wavelength and shows antiphase light curves in the far ultraviolet and visual regions. In hot magnetic stars, the modulation of the stellar wind by the magnetic field and the wind blanketing cause the light variability with a typical amplitude of the order of millimagnitudes. We predict the light variations in selected magnetic hot stars and compare the simulated light curves with light variations derived from observations.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Masaryk University, Royal Military College of Canada, Uniwersytet Wrocławski, Uppsala University

Journal

Contributions of the Astronomical Observatory Skalnaté Pleso

Band

48

Seiten

170-174

Anzahl der Seiten

5

ISSN

1335-1842

Publikationsdatum

01-2018

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ff7c5041-10db-48cc-ab51-59f50c84c80a