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April11
April11

Properties of Main Sequence Stars
Properties of Main Sequence Stars

Mountain-Skies-2016-0718
Mountain-Skies-2016-0718

... To   the   northeast   of   Lyra   is   the   bright   star   Deneb   that   represents   the   tail   of   the   beautiful   swan   Cygnus.    Tracing  a  line  of  stars  from  Deneb  towards  the  south,  we  note  the  body  and  long  neck  of  the   swan   terminating   in   the   star   Albir ...
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... Measuring Distance to Stars • Parallax is determined by taking a picture of a star at one time, and another picture six months later; using the angle between its apparent shift, astronomers can determine how far away it is • The nearest stars have large parallax angles, while those of distant stars ...
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Lecture 22 - Star Formation from Molecular Clouds
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Lyra



Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.
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