For example, it is not clear that enough matter can be accreted by a white dwarf, at the distance of the purported secondary star implied by the orbital period, sufficient to power an X-ray emission of nearly 10 33 erg/s or 100 YW. However, there are difficulties with either of these hypotheses. Historically, it has been held that these X-rays might be excited by matter originating from the star, from a hot wind or a disk around the star, accreting onto the surface of a degenerate companion, such as a white dwarf or neutron star. The character of the X-ray spectrum is Be thermal, possibly emitted from plasmas of temperatures up to least ten million kelvins, and shows very short term and long-term cycles. Gamma Cassiopeiae is the prototype of a small group of stellar sources of X-ray radiation that is about 10 times stronger than emitted from other B or Be stars. The outer atmosphere has an intense effective temperature of 25,000 K, which is causing it to glow with a blue-white hue. At this rate of emission, the star has reached the end of its life as a late O-type main sequence star after a relatively brief 8 million years. It has 17 times the Sun's mass and is radiating as much energy as 34,000 Suns. This places it among a category known as Be stars in fact, the first such star ever to be so designated. The 'e' suffix is used for stars that show emission lines of hydrogen in the spectrum, caused in this case by the circumstellar disk. A luminosity class of IV identifies it as a subgiant star that has reached a stage of its evolution where it is exhausting the supply of hydrogen in its core region and transforming into a giant star. The spectrum of this massive star matches a stellar classification of B0.5 IVe. The emissions and brightness variations are apparently caused by this " decretion disk". When combined with the star's high luminosity, the result is the ejection of matter that forms a hot circumstellar disk of gas. Gamma Cassiopeiae is a rapidly spinning star with a projected rotational velocity of 472 km s −1, giving it a pronounced equatorial bulge. At maximum intensity, γ Cassiopeiae outshines both Schedar (α Cas magnitude 2.25) and Caph (β Cas 2.3). It has since been gradually brightening back to around 2.2. In the late 1930s it underwent what is described as a shell episode and the brightness increased to above magnitude 2.0, then dropped rapidly to 3.4. It is the prototype of the class of Gamma Cassiopeiae variable stars. Gamma Cassiopeiae is an eruptive variable star, whose apparent magnitude changes irregularly from 1.6 at its brightest to 3.0 at its dimmest. The bright star due south of Gamma Cassiopeiae is HD 5408, a common proper motion companion. For more in depth work sheets on constellations. Click on Kidskonnect Worksheetsįor further reading and more information on the Cassiopeia Constellation visit image of γ Cassiopeiae and the associated nebulae IC63 and IC59. What number star ranking is Cassiopeia in the celestial sphere?ĭownload questions about the Cassiopeia Constellation here: Cassiopeia (answers are on this page) How many stars have planets in Cassiopeia? What are the brightest star in Cassiopeia ? How many main stars does Cassiopeia have? Alpha Cassiopeiae is the brightest star in Cassiopeia. Tycho’s Star supernova was visible in Cassiopeia from Earth in 1572. # 1. Cassiopeia has 14 stars with planets. Main Stars:Cassiopeia consists of 5 main stars. Star Raking: 25th largest constellation in the celestial sphere. The hero Perseus however saved Andromeda.īordering Constellations: Cassiopeia is bordered by constellations Perseus, Andromeda, Lacerta, Cepheus & Camelopardalis. The myth goes that Cassiopeia & Cepheus attempted sacrifice their daughter Andromeda to god of the sea Poseidon to rid themselves of the curse of the monster bestowed onto them by Poseidon. In Greek mythology, Cassiopeia was a vain queen, the wife of king Cepheus. Symbolism: Cassiopeia is also known as ‘The Vain Queen’Ĭassiopeia is a constellation in the northern sky, and is easily recognizable due to its shape of its 5 main stars, that form a W. Cassiopeia is one of the 88 constellations within the celestial sphere.Ĭassiopeia is one of the 17 constellations that represents a mythological character.
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