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Sirius B. By: Amber Shelton. About Sirius B…. - PowerPoint PPT Presentation

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By: Amber Shelton

By: Amber SheltonSirius B About Sirius B.Sirius B is a white dwarf. There was no such thing as Sirius B until 1862 when Alvan Clark discovered it while testing one of the best optical telescopes in the world, at the time. They didnt know anything of it because Sirius A is so bright.

About Sirius B.Sirius B orbits Sirius A. Since the discovery of Sirius B, scientists have been agitated and frustrated because Sirius A is so bright that they cant observe and weigh Sirius A. Sirius is located in the constellation Canis Major.

More about Sirius B.Sirius has a surface temperature of 25,000 degrees Celcius, which produces very low energy X-rays. Sirius B is 10, 000 times dimmer than Sirius A. Sirius B has a mass equal to the mass of the Sun, packed into a diameter that is 90% that of the Earth.Star formation

Theory of White dwarf stars:The theory of white dwarf stars was developed by S. Chandrasekhar, his name came from the Chandra X-ray Observatory. The story of Sirius B came full known when it was observed by Chandra in October 1999 during the test period.All about sirius b:Sirius B is not a normal star; its spectrum and luminosity indicates that it is hot, but extremely small.The reason is that the spectrum contains pressure-broadened hydrogen lines, implying a surface environment with a higher density than what a normal star would have.Assuming the spectrum of Sirius B being a blackbody and using the well-established distance to Sirius, we think that from its luminosity, Sirius Bs radius is only about 5,800 km.According to Keplers law, we can infer that the mass of Sirius B is about 1.03 M.

Interesting facts about sirius B: The gravity on Sirius B is 400,000 times more than gravity on Earth!!One teaspoon of a white dwarf would way 5 tonsIn 1844, Sirius B was predicted because of the motion of Sirius A. Even though, Sirius B wasnt seen until 1862!The average mass of a star is 0.58 M, when Sirius Bs mass is 1.03 M.8Pictures:

Summary:Sirius B is a white dwarf star. It is way less brighter than Sirius A. It orbits Sirius A and would way a lot just to pick a little bit of it up. It is a well-known star that is good for observing.Sirius BQuiz:Sirius B is in the main sequence.TrueFalseQuiz:What star does Sirius B orbit?PolarisVegaSirius AAltairQuiz:When was Sirius B discovered?201018621831192613Quiz:What type of star is Sirius B?Blue giantRed giantWhite dwarfYellow-white super giantQuiz: What constellation is the star located in?Canis MajorUrsa MajorLyraAquilaWorks Cited:http://www.ufodigest.com/siriusb.htmlhttp://space.about.com/od/stars/p/siriusinfo.htmhttp://chandra.harvard.edu/photo/2000/0065/http://hyperphysics.phy-astr.gsu.edu/hbase/astro/whdwar.html#c2http://hyperphysics.phy-astr.gsu.edu/hbase/astro/whdwar.htmlhttp://eagle.phys.utk.edu/guidry/astro411/lectures/lecture_ch12.pdf

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