\u03b2 Lyrae (Sheliak)<\/strong><\/em> is one of the stars that are best explored. In binoculars you can clearly see two stars, separated 46 arc seconds from each other. The darker star is at a constant 6.7m<\/sup>, while the brighter star is one of the most remarkable eclipsing binaries. Within 12.94 days its brightness decreases twice from 3.3m<\/sup> to 3.8m<\/sup> and 4.1m<\/sup>. You can see the light change very well if you compare it to the 3.3m<\/sup> bright \u03b3 Lyrae. \u03b2\u00b9 consists of two stars with fifteen and nineteen times the solar diameter, which are separated only by 22 million miles (35 million kilometers). Thus, the atmospheres of the two stars, which are distorted to an elliptical shape, overlap. Moreover, they mutually exchange matter, which slows the period. The light curve appears rounded by the deformation of the stars. \u03b4 Lyrae<\/strong><\/em> is an optical double star. The main star is a 5.6m<\/sup> bluish-white star at a distance of 1,080 light-years. 10.5 arc minutes away from it you can find a red giant with a distance of 900 light-years. This red giant changes its brightness regularly from 4.5 and 6.5m<\/sup>. The color contrast between the two stars is striking. A look at the surrounding area is also worth it. The star pair marks the open cluster Stephenson 1<\/em><\/strong>, which is also referred to as \u03b4 Lyrae group<\/em><\/strong>. The 1,000 light-years distant star cluster has a diameter of about 20 arc minutes, which corresponds to six light-years. It is 50 million years old, about as old as the Pleiades, and offers a pretty sight especially in larger binoculars.<\/p>\n \u03b5 Lyrae<\/em><\/strong> is a popular object at every star party to demonstrate the resolution capability of smaller telescopes. \u03b5 \u00b9 and \u03b5\u00b2 stand 208 arcsec apart, which corresponds approximately to the resolution limit of the naked eye. \u03b5\u00b9 is the more northerly of the two stars that shine approximately at the same brightness \u2013 5.0 and 5.2m<\/sup>. \u03b5 Lyrae is 160 light-years away, so the two stars are separated by 0.2 light-years from each other.<\/p>\n In a telescope with at least 100x magnification, you can see that each of the two stars has a close companion. As \u201eDouble Double\u201c<\/em><\/strong>, this quadruple star is one of the most well-known multiple stars and is often used as a test object for small telescopes. The brightest star might even be a spectroscopic binary, but this is not for sure yet. The most famous object in this constellation is M 57, the Ring Nebula<\/em><\/strong>. It can be seen in binoculars at best as an unobtrusive, 9.0m<\/sup> bright star. At 15x magnification it appears a bit fuzzy (see the illustration in the chapter Stars and Deep-Sky-Objects). Although it is one of the most beautiful planetary nebulae, which can be observed through the telescope, it remains at best a difficult object even in large binoculars \u2013 only a telescope can deliver the necessary magnification. The 1,800 light-years distant stellar corpse is only about one minute of arc in size and slightly southward from the line of \u03b2 and \u03b3 Lyrae. The real diameter of M\u200957 is half a light-year, the nebula extends with about 11 miles per second (18 km\/s). It was created about 20,000 years ago.<\/p>\n The five minutes of arc large globular cluster M 56<\/em><\/strong> is slightly easier to see than M\u200957 and appears as 8.3m<\/sup> bright, structure less patch of light. It is located about halfway between \u03b2 Cygni (Albireo) and \u03b3 Lyrae in a star-rich region. 32,000 light-years separate us from it.<\/p>\n","protected":false},"excerpt":{"rendered":" Lyra with the bright main star Vega is a small but distinctive constellation. The deep-sky objects in Lyra are mainly interesting for telescope owners, but it also contains some bright stars for the naked eye. \u03b1 Lyrae (Vega) is only 25 light-years away. It is a very young star and still surrounded by a disk … Lyra<\/span> weiterlesen
\nFour other stars also belong to the 880 light-years away \u03b2 Lyrae system, but they remain invisible in binoculars and require a telescope.<\/p>\n
\n\u03b6 Lyrae is a physical double star, whose components are 44 seconds of arc apart. It can easily be separated with 7x magnification. \u03b6 Lyrae is 155 light-years away, the two individual stars are 4.4 and 5.6m<\/sup> bright.<\/p>\n![\"Der](\"http:\/\/freebook.fernglas-astronomie.de\/wp-content\/uploads\/2014\/04\/M57.jpg\")
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