Hot Blue Star On M47

Astronomy Science ~ Messier 47 is located about 1,600 light years from Earth, in the Puppis constellation. The star cluster was first seen...

Astronomy Science ~ Messier 47 is located about 1,600 light years from Earth, in the Puppis constellation. The star cluster was first seen several times before in 1654 by the Italian astronomer Giovanni Battista Hodierna and subsequently independently discovered by Charles Messier himself, who seems to have no knowledge of the previous Hodierna observations.

Although bright and easy to see, Messier 47 is one of the open star cluster that is less densely populated. Only about 50 stars visible in the area about 12 light-years, compared with other similar star clusters which can contain thousands of stars.

Messier 47
Messier 47
Messier 47 is not always easy to identify. In fact, over the years, the object was thought to be lost, such as the wrong note Messier coordinates. The cluster was then rediscovered and given the designation of other catalogs - NGC 2422. The nature of Messier's error, and the firm conclusion that Messier 47 and NGC 2422 is indeed the same object, only founded in 1959 by Canadian astronomers TF Morris.

Bright blue-white color of these stars is an indication of their temperature, hot stars appear blue and cold star looks red. The relationship between color, brightness and temperature can be visualized by using the Planck curve. However, more detailed studies about the color of stars using spectroscopy also tell astronomers more-including how fast these stars spin and chemical composition. There are also some bright red stars are visible in the picture. This is a red giant star which is included in the advanced life cycle where it was swell.

Incidentally, Messier 47 appears in the sky close to the other star cluster, cluster Messier 46. Messier 47 is relatively close, about 1600 light-years away, but Messier 46 is located about 5500 light-years across and contains more stars, at least 500 stars. Although it contains more stars, its appearance is significantly dimmed because the distance is greater.

Messier 46 can be considered as a brother of Messier 47, since older age about 300 million years old Messier 47 compared to 78 million years. As a result, many of the stars of the biggest and brightest Messier 46 underwent their short lives and are no longer visible, so most of the stars in the older cluster looks redder and cooler.
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Astronomy Science: Hot Blue Star On M47
Hot Blue Star On M47
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