Presentation on theme: "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."— Presentation transcript:
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 didn’t know anything of it because Sirius A is so bright.
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 can’t observe and weigh Sirius A. Sirius is located in the constellation Canis Major.
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.
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.
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 B’s radius is only about 5,800 km. According to Kepler’s law, we can infer that the mass of Sirius B is about 1.03 M.
The gravity on Sirius B is 400,000 times more than gravity on Earth!! One teaspoon of a white dwarf would way 5 tons In 1844, Sirius B was predicted because of the motion of Sirius A. Even though, Sirius B wasn’t seen until 1862! The average mass of a star is 0.58 M, when Sirius B’s mass is 1.03 M.