- photospheres
- n. bright visible surface of the sun'fəʊtəʊsfɪr /'fəʊtəsfɪə
English contemporary dictionary. 2014.
photospheres
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Model photosphere — Some essential steps in model atmosphere analysis for determining stellar abundances (Figure by Bengt Gustafsson, Astronomical Observatory, Uppsala). The photosphere denotes those solar or stellar surface layers from which optical radiation… … Wikipedia
Star — For other uses, see Star (disambiguation) … Wikipedia
Photosphere — The photosphere of an astronomical object is the region from which externally received light comes. The term itself is derived from Ancient Greek roots, φως¨ φωτος/ photos meaning light and σφαιρος/ sphairos meaning ball, in reference to the fact … Wikipedia
Differential rotation — is seen when different parts of a rotating object move with different angular velocities (rates of rotation) at different latitudes and/or depths of the body and/or in time. This indicates that the object is not solid. In fluid objects, such as… … Wikipedia
Astronomical spectroscopy — is the technique of spectroscopy used in astronomy. The object of study is the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other celestial objects. Spectroscopy can be used to derive many… … Wikipedia
Differential rotation in stars — What is differential rotation? *Differential rotation is when a rotating body has different angular velocities at different latitudes and/or depths of the body and/or in time. Differential rotation can be applied to any type of fluid body such as … Wikipedia
Ap and Bp star — Ap and Bp stars are peculiar stars (hence the “p”) of types A and B which show overabundances of some rare earth metals (e.g., europium) or others (e.g., strontium). These stars have a much slower rotation than normal for A and B type stars ,… … Wikipedia
Doppler imaging — Not to be confused with Doppler ultrasound. Inhomogeneous structures on stellar surfaces, i.e. temperature differences, chemical composition or magnetic fields, create characteristic distortions in the spectral lines due to the Doppler effect.… … Wikipedia
General Catalogue of Stellar Radial Velocities — The General Catalogue of Stellar Radial Velocities is a star catalogue which lists radial velocities for 15,107 stars. [p. 18, The Observation and Analysis of Stellar Photospheres , David F. Gray, Cambridge University Press, 2005, ISBN 0521851866 … Wikipedia
Äquivalentbreite — Die Äquivalentbreite ist eine Messgröße der Astrospektroskopie für die Stärke der Linien in einem Absorptionsspektrum. Sie stellt eine Größe dar, die nicht von den Eigenschaften der verwendeten Apparatur abhängt, und eignet sich deshalb gut zum… … Deutsch Wikipedia
