منابع مشابه
Magnetic topologies of cool stars
Stellar magnetic fields can be investigated using several, very complementary approaches. While conventional spectroscopy is capable of estimating the average magnetic strength of potentially complex field configurations thanks to its low sensitivity to the vector properties of the field, spectropolarimetry can be used to map the mediumand large-scale structure of magnetic topologies. In partic...
متن کاملAn Atlas of K - line Spectra for Cool Magnetic CP Stars
We present a short atlas illustrating the unusual Ca ii K-line profiles in upper main sequence stars with anomalous abundances. Slopes of the profiles for 10 cool, magnetic chemically peculiar (CP) stars change abruptly at the very core, forming a deep " nib. " The nibs show the same or nearly the same radial velocity as the other atomic lines. The near wings are generally more shallow than in ...
متن کاملMagnetic fields of cool active stars
Rosén, L. 2016. Magnetic fields of cool active stars. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1367. 67 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9561-9. Magnetic fields are present throughout the universe and are very important for many astrophysical processes. Magnetic field influences a star throughout its life and...
متن کاملMultiplicity among chemically peculiar stars II . Cool magnetic Ap stars ⋆
We present new orbits for sixteen Ap spectroscopic binaries, four of which might in fact be Am stars, and give their orbital elements. Rough estimates of the individual masses of the components of HD 65339 (53 Cam) are given, combining our radial velocities with the results of speckle interferometry and with Hipparcos parallaxes. Considering the mass functions of 74 spectroscopic binaries from ...
متن کاملMagnetic flux transport on active cool stars and starspot lifetimes
Context. Many rapidly rotating cool stars show signatures of large magnetic regions at all latitudes. Mid-latitude starspots and magnetic regions have characteristic lifetimes of 1 month or less, as indicated by observations using (Zeeman-) Doppler imaging techniques. Aims. We aim to estimate the lifetimes of bipolar magnetic regions and starspots on the surfaces of cool stars. We consider diff...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1986
ISSN: 0252-9211
DOI: 10.1017/s0252921100091703