AM Herculis

AM Herculis

AM Herculis is the prototype for a category of cataclysmic variable stars called polars, or AM Herculis stars. It is located in the constellation Hercules, and was discovered in 1923 by Max Wolf in Heidelberg, Germany and was then listed in the General Catalogue of Variable Stars as an irregular variable which ranged from 12th to 14th magnitude. In 1976, the astronomer S. Tapia discovered that light from the star is both linearly and circularly polarized , showing that there was a strong magnetic field surrounding the system and revealing that the system was more complex than previously thought.

External links

* [http://www.aavso.org/vstar/vsots/0601.shtml Variable Star Of The Month] by the American Association of Variable Star Observers


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  • HERCULIS ins — hodie Asinara, teste Ortelio, ins. Sardiniae in ora Occid. ubi duas Herculis insulas, Plin. l. 3. c. 7. habet. Ea Linaria, teste Fran. Fara, cui magis habenda fides tamquam indigenae …   Hofmann J. Lexicon universale

  • Hercŭlis insŭlae — Hercŭlis insŭlae, zwei Eilande an der Nordwestspitze Sardiniens; jetzt Asinara u. Piana …   Pierer's Universal-Lexikon

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  • Hercŭlis promontorĭum — Hercŭlis promontorĭum, Vorgebirg, 1) in Britannia romana, an der Westküste; jetzt Hartland Point; 2) in Bruttium die südlichste Spitze Italiens; jetzt Cap Spartivento; 3) in Mauritanien; jetzt Cap Mogador …   Pierer's Universal-Lexikon

  • Hercŭlis scyphus — (Ant.), großer Becher, zwei Congii (ungefähr. 11/2 Kanne) fassend …   Pierer's Universal-Lexikon

  • Hercŭlis sylva — (a. Geogr.), Wald in Germanien, östlich von der Weser; jetzt der Süntel in Westfalen …   Pierer's Universal-Lexikon

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