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| 132 files in 12 albums and 1 categories with 0 comments viewed 93,606 times |
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etaha-2.jpgEta Carinae in HA.736 viewsThis stellar system is currently one of the most massive that can be studied in great detail. Until recently, Eta Carinae was thought to be the most massive single star, but it was recently demoted to a binary system.[7] The most massive star in the Eta Carinae multiple star system has more than 100 times the mass of the Sun. Other known massive stars are more luminous and more massive.
Stars in the mass class of Eta Carinae, with more than 100 times the mass of the Sun, produce more than a million times as much light as the Sun. They are quite rare — only a few dozen in a galaxy as big as the Milky Way. They are assumed to approach (or potentially exceed) the Eddington limit, i.e., the outward pressure of their radiation is almost strong enough to counteract gravity. Stars that are more than 120 solar masses exceed the theoretical Eddington limit, and their gravity is barely strong enough to hold in their radiation and gas.
Eta Carinae's chief significance for astrophysics is based on its giant eruption or supernova impostor event, which was observed around 1843. In a few years, Eta Carinae produced almost as much visible light as a supernova explosion, but it survived. Other supernova impostors have been seen in other galaxies, for example the false supernovae SN 1961v in NGC 1058[8] and SN 2006jc in UGC 4904,[9] which produced a false supernova, noted in October 2004. Significantly, SN 2006jc was destroyed in a supernova explosion two years later, observed on October 9, 2006.[10] The supernova impostor phenomenon may represent a surface instability[11] or a failed supernova. Eta Carinae's giant eruption was the prototype for this phenomenon, and after nearly 170 years the star's internal structure has not fully recovered.Martin
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IMG_0499.jpg297 viewsMark swinging the log splitterMartin
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Eta_Carina.jpgEta Carinae698 viewstest image with OAG.Martin
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NGC4945_supernova.jpgNGC4945726 viewsNGC4945 with the supernova 2011ja (January 01-2012).Martin
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Eta-done2G.jpgEta Carinae guiding test with a OAG on the g11 and G2 controller.693 viewsLuminance 5 Minutes and RGB 200 Seconds eachMartin
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IMG_0518.jpgnice view949 viewsnice viewMartinMay 21, 2016
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IMG_0517.jpgARB Kev1003 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg476 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg488 viewsJacki and carMartinMay 21, 2016
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IMG_0514.jpg486 viewsAlex's carMartinMay 21, 2016
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IMG_0513.jpg496 viewsScotty's carMartinMay 21, 2016
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IMG_0512.jpg495 viewsMark beside his carMartinMay 21, 2016
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IMG_0511.jpg485 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016
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