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NGC 7635 (Bubble Nebula)


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NGC 7635
Emission Nebula (散光星雲)
Bubble Nebula (バブル星雲)
Nb EN


別名 (Other names)
Sharpless 162, Sh 2-162, LBN 549 in Sh2-162, Caldwell 11

星座 (Constellation)
カシオペア座 (Cas) (Cassiopeia)

距離 (Distance)
11,000光年 (11,000 light-years)

NGC 7635(Sh2-162, Caldwell 11)は、カシオペヤ座に位置する散光星雲(HII領域)。
この星雲は、M52(散開星団)の近くに位置して見える。
1787年に、ウィリアム・ハーシェルによって発見された。

泡状に見える部分は、中心の8.71等の若く高温な大質量(15 ± 5 M☉)な恒星、SAO 20575(BD+60 2522)からの恒星風によって作られている。なお、SAO 20575(BD+60 2522)は、10-40太陽質量だと推測されている。

この星雲は巨大な分子雲の近くにあり、星雲自体は熱い中心星によって膨張している。

観望
8~10インチの望遠鏡では、星の周囲の大きいシェルは非常にぼんやりと見える。
星雲の西に位置する7等星が観望の邪魔になるが、そらし目を用いれば星雲を見ることができる。
16~18インチの望遠鏡では、かすかな星雲が不規則で南北方向に伸びていることがわかる。

NGC 7635 (Bubble Nebula) is an emission nebula located 11,000 light years from the Earth in the constellation Cassiopeia.

NGC 7635 (Bubble Nebula) : Picture

The Bubble Nebula
The Bubble Nebula
(C) Yves Van den Broek
Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape. Cataloged as NGC 7635, it is also known simply as The Bubble Nebula. Although it looks delicate, the 10 light-year diameter bubble offers evidence of violent processes at work. Above and right of the Bubble's center is a hot, O star, several hundred thousand times more luminous and around 45 times more massive than the Sun. A fierce stellar wind and intense radiation from that star has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud. The intriguing Bubble Nebula lies a mere 11,000 light-years away toward the boastful constellation Cassiopeia. This view of the cosmic bubble is composed of narrowband and broadband image data, capturing details in the emission region while recording a natural looking field of stars.

NGC 7635: The Bubble Nebula
NGC 7635: The Bubble Nebula
(C) Larry Van Vleet

The Bubble Nebula
The Bubble Nebula
(C) Dave Jurasevich (Mount Wilson Observatory)

The Bubble Nebula from NOAO
The Bubble Nebula from NOAO
(C) Brad Ehrhorn & Adam Block, NOAO, AURA, NSF

The Bubble Nebula
The Bubble Nebula
(C) Kent Wood

NGC 7635: The Bubble
NGC 7635: The Bubble
(C) Eric Mouquet

NGC 7635: The Bubble Nebula
NGC 7635: The Bubble Nebula
(C) T. Bonev et al. (Astron. Inst., U. Bonn), Pik Terskol Obs.

NGC 7635: The Bubble Nebula
NGC 7635: The Bubble Nebula
(C) Donald Walter (SCSU) et al., WFPC2, HST, NASA
What created this huge space bubble? A massive star that is not only bright and blue, but also emitting a fast stellar wind of ionized gas. The Bubble Nebula is actually the smallest of three bubbles surrounding massive star BD+602522, and part of gigantic bubble network S162 created with the help of other massive stars. As fast moving gas expands off BD+602522, it pushes surrounding sparse gas into a shell. The energetic starlight then ionizes the shell, causing it to glow. The above picture taken with the Hubble Space Telescope and released last week shows many details of the Bubble Nebula never seen before and many still not understood. The nebula, also known as NGC 7635, is about six light-years across and visible with a small telescope towards the constellation of Cassiopeia.

The Bubble and M52
The Bubble and M52
(C) Lóránd Fényes
To the eye, this cosmic composition nicely balances the Bubble Nebula at the lower right with open star cluster M52. The pair would be lopsided on other scales, though. Embedded in a complex of interstellar dust and gas and blown by the winds from a single, massive O-type star, the Bubble Nebula, also known as NGC 7635, is a mere 10 light-years wide. On the other hand, M52 is a rich open cluster of around a thousand stars. The cluster is about 25 light-years across. Seen toward the northern boundary of Cassiopeia, distance estimates for the Bubble Nebula and associated cloud complex are around 11,000 light-years, while star cluster M52 lies nearly 5,000 light-years away. The wide telescopic field of view spans about 1.5 degrees on the sky or three times the apparent size of the Full Moon.

The Bubble and M52
The Bubble and M52
(C) Tony Hallas

NGC 7635 : Bubble Nebula NGC 7635 : Bubble Nebula
NGC 7635 : Bubble Nebula
(C) Yves Van den Broek
NGC 7635 : Bubble Nebula
(C) Larry Van Vleet
NGC 7635 : Bubble Nebula NGC 7635 : Bubble Nebula
NGC 7635 : Bubble Nebula
(C) Dave Jurasevich
NGC 7635 : Bubble Nebula
(C) Kent Wood
NGC 7635 : Bubble Nebula NGC 7635 : Bubble Nebula
NGC 7635 : Bubble Nebula
(C) NOAO
NGC 7635 : Bubble Nebula
(C) Eric Mouquet
NGC 7635 : Bubble Nebula NGC 7635 : Bubble Nebula
NGC 7635 : Bubble Nebula
(C) T. Bonev et al., Pik Terskol Obs.
NGC 7635 : Bubble Nebula
(C) NASA
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「ウィキペディア(wikipedia):フリー百科事典」より文章引用。
NGC 7635. (2013, April 9). In Wikipedia.
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