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Форум » Досуг » Космос » NGC 40 или Туманность Галстук-бабочка
NGC 40 или Туманность Галстук-бабочка
ingvarr
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Дата: 11.09.2016, 12:50:41 | Сообщение № 1
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NGC 40 или Туманность Галстук-бабочка — планетарная туманность в созвездии Цефей

Объект был открыт английским астрономом Уильямом Гершелем 25 ноября 1788 года.
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NGC 40, the Bow-Tie Nebula (= PGC 2923327)
Discovered (Nov 25, 1788) by William Herschel
Also observed (Nov 20, 1829) by John Herschel
A magnitude 12.3 planetary nebula in Cepheus (RA 00 13 01.0, Dec +72 31 19)
Historical Identification: Per Dreyer, NGC 40 (= GC 20 = JH 8 = WH IV 58, 1860 RA 00 05 27, NPD 18 15.4) is "faint, very small, round, very suddenly much brighter middle, 12th magnitude star to southwest". The position precesses to RA 00 13 00.7, Dec +72 31 20, dead center on the nebula listed above, and there is an appropriate star to the southwest, so the identification is certain.
Physical Information: NGC 40 is the result of a sunlike star ejecting material into space, during its transformation from a red giant (or dying star) to a white dwarf (or "dead" star). The central star in the nebula is a recently formed, very hot (about 100 thousand Fahrenheit degrees) proto-white dwarf. The nebula is about 3500 light years away, and 1 light year across. Most of the radiation from the nebula is given off by clouds of gas heated to about 20 thousand (Fahrenheit) degrees by the light of the star, but there are also regions which have been heated to millions of degrees by compressive forces generated by the collision of interstellar and previously ejected gases with a 2 million mile per hour stellar wind emitted by the dying star. Over a period of 30 or 40 thousand years, the radiation and stellar wind from the white dwarf will fade away, and the nebula will disappear from view. This is the blink of an eye in astronomical terms, but about one planetary nebula is formed in our galaxy each year, so at any given time there are tens of thousands of them scattered across the galaxy. NGC 40 is sometimes referred to as the "Bow-Tie Nebula" due to the faint extensions to the northwest and south, as shown in the wide-field images.

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