La Superba (Y CVn, Y Canum Venaticorum) is a variable star in the constellation Canes Venatici, well known for its strikingly red appearance.
Appearance [edit]. La Superba is a semiregular variable star, varying by about a magnitude over a roughly 160-day cycle, but with slower variation over a larger range. Periods of 194 and 186 days have been suggested, with a resonance between the periods. La Superba is most likely in the final stages of fusing its remaining secondary fuel (helium) into carbon and shedding its mass at the rate of about a million times that of the Sun's solar wind. Astronomers gauge the “redness” of a star by measuring its magnitude contrast through a blue and visible (green peaking) filters. This is what is known as its B-V index, and the higher the value, the redder the star. La Superba has a B-V value of +2.5. For contrast, the familiar orange-red stars Antares and Betelgeuse have a B-V value of +1.83 & +1.85, respectively. I’ve shown off carbon stars such as La Superba and Hind’s Crimson Star at public star parties to great effect. They can be an excellent star party “ secret weapon ” when every other ‘scope down the line is aimed at the Orion nebula. For a faint constellation, Canes Venatici has lots to offer. The name  La Superba was given to Y CVn by Father Angelo Secchi (a 19th century star classifier) because of the beauty of its spectrum. La Superba, is a variable star, with a period of 160 days. It's magnitude varies from 4.8 to 6.4. According to James Kaler, Y CVn is one of the coolest naked eye stars, with a temperature of 2200 Kelvin. If you cannot detect using your naked eyes, don't worry. La Superba is easy to locate. Start at 12 Alpha Canum Venaticorum, also knows as Cor Caroli, a double star of magnitude 2.89. One class of stars can induce this effect. They’re known as carbon stars. A fine example of just such an object rides high in the late spring sky for northern hemisphere observers. This is the variable star Y Canum Venaticorum, also abbreviated as Y CVn or “ La Superba ” (The magnificent). This name was given to the star by Father Angelo Secchi in the mid-19 th century. I’ve shown off carbon stars such as La Superba and Hind’s Crimson Star at public star parties to great effect. They can be an excellent star party “ secret weapon ” when every other ‘scope down the line is aimed at the Orion nebula. For a faint constellation, Canes Venatici has lots to offer. Deepsky Top-100 (11): Y cnv (La Superba). In Canes Venatici, the hunting dogs, you can find a beautiful red star, Y Canum Venaticorum, or La Superba. Y CVn is a carbon star. Most of these class C stars are evolved cooling giants with a large abundance of carbon dust in their outer shells. According to James Kaler, Y CVn is one of the coolest naked eye stars, with a temperature of 2200 Kelvin. If you cannot detect using your naked eyes, don't worry. La Superba is easy to locate. Start at 12 Alpha Canum Venaticorum, also knows as Cor Caroli, a double star of magnitude 2.89. Near maximum, it becomes just bright enough to see with the unaided eye, but the star's beautiful red hue is easy to see in binoculars or a small telescope. In fact, La Superba is among the brightest of the carbon stars-cool, highly evolved red giant stars with exceptional abundances of carbon. Explanation: Y Canum Venaticorum (Y CVn) is a very rare star in planet Earth's night sky. It's also very red, exhibiting such a remarkable spectrum of light, 19th century astronomer Angelo Secchi dubbed it La Superba. It is similar to the Sun in terms of age, mass and stage of evolution, and it has been called a solar analogue or solar twin. La Superba – Y Canum Venaticorum (Gamma Canum Venaticorum, Y CVn). La Superba is a well known star in Canes Venatici and one of the reddest stars in the sky. It was named La Superba by 19th century Italian astronomer Angelo Secchi because of its striking appearance. The star is believed to be in the last stages of fusing its secondary fuel, helium, into carbon.  La Superba (Y CVn, Y Canum Venaticorum) is a variable star in the constellation Canes Venatici, well known for its strikingly red appearance. La Superba is most likely in the final stages of fusing its remaining secondary fuel (helium) into carbon and shedding its mass at the rate of about a million times that of the Sun's solar wind.
https://en.wikipedia.org/wiki/La_Superba http://www.universetoday.com/102161/seeing-the-red-of-la-superba-a-magnificent-springtime-carbon-star/ http://www.backyard-astro.com/deepsky/top100/11.html http://www.universetoday.com/102161/seeing-the-red-of-la-superba-a-magnificent-springtime-carbon-star/ http://www.backyard-astro.com/deepsky/top100/11.html http://apod.nasa.gov/apod/ap081218.html http://www.constellation-guide.com/constellation-list/canes-venatici-constellation/ https://en.wikipedia.org/wiki/La_Superba
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