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V838 Mon (Variable Star)


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V838 Mon
Variable Star (変光星)

星座 (Constellation)
いっかくじゅう座 (Mon) (Monoceros)


距離 (Distance)
20,000光年 (20,000 light-years)

V838星:2002年に出現した新星 (Nova Monocerotis 2002)。
同年1月6日にアウトバーストが始まり、現在もライト・エコーの広がりが観測されている。
当初は典型的な新星と考えられていたが、様々な相違点が指摘されている。
距離はおよそ2万光年(6キロパーセク)と推定されている。

V838 Mon is a variable star located 20,000 light years from the Earth in the constellation Monoceros.

V838 Mon (Variable Star) : Picture

Light Echoes from V838 Mon
Light Echoes from V838 Mon
(C) NASA, ESA, H. E. Bond (STScI)
What caused this outburst of V838 Mon? For reasons unknown, star V838 Mon's outer surface suddenly greatly expanded with the result that it became the brightest star in the entire Milky Way Galaxy in January 2002. Then, just as suddenly, it faded. A stellar flash like this had never been seen before -- supernovas and novas expel matter out into space. Although the V838 Mon flash appears to expel material into space, what is seen in the above image from the Hubble Space Telescope is actually an outwardly moving light echo of the bright flash. In a light echo, light from the flash is reflected by successively more distant rings in the complex array of ambient interstellar dust that already surrounded the star. V838 Mon lies about 20,000 light years away toward the constellation of Monoceros, while the light echo above spans about six light years in diameter.

V838 Mon: Echoes from the Edge
V838 Mon: Echoes from the Edge
(C) NASA, ESA, and H. Bond (STScI)

What the Hubble Saw
What the Hubble Saw
(C) Judy W. Ross,  Point Roberts, WA
In this striking 41 inch by 38 inch quilt, astronomy enthusiast Judy Ross has interpreted some of the Hubble Space Telescope's best galactic and extragalactic vistas. Featured in past APODs, clockwise from the lower right are; the Red Rectangle Nebula, the Eskimo Nebula, the Sleeping Beauty Galaxy, V838 Monocerotis - the Milky Way's most mysterious star, and supernova remnant N49 - the cosmic debris from an exploded star. Of course, quilts have been used historically to represent astronomical concepts. And while inspired by the images of the cosmos that she incorporates into her quilts, Ross reports that she is still a little daunted by the intricacies of the Cat's Eye Nebula revealed by the Hubble's sharp vision.

The Expanding Light Echo of Red Supergiant Star V838 Monocerotis
The Expanding Light Echo of Red Supergiant Star V838 Monocerotis
(C) NASA, ESA, and Z. Levay (STScI)
This image shows a time sequence of Hubble Space Telescope images of the light echo around V838 Mon, taken between May 2002 and October 2004. All six pictures were taken with Hubble's Advanced Camera for Surveys using filters sensitive to blue, visible, and infrared wavelengths. The apparent expansion of the light echo, as light from the early 2002 outburst of V838 Mon propagates outward into the surrounding dust, is clearly shown.

All of the images are shown at the same scale. Moreover, the images are also shown as they would appear for the same exposure times throughout the sequence. Thus the background stars appear constant in brightness, while the surface brightness of the light echo steadily declines. The fading of the light echo is primarily due to the light-scattering properties of interstellar dust. Consider a street lamp on a foggy night. The halo around the lamp is brightest right next to the lamp, while out to the side it is much fainter. Similarly, in the first V838 Mon image, taken in May 2002, the light echo was very bright and compact. At later times, we are seeing dust out to the side of the star, rather than dust that is immediately in front of the star, so the amount of light scattered in our direction is smaller. Hubble astronomers expect the light echo to continue to change its appearance and brightness over the next several years.

V838 Mon: Mystery Star
V838 Mon: Mystery Star
(C) Lisa Crause (Univ. Cape Town), Warrick Lawson (Australian Defence Force Academy)

V838 Mon
V838 Mon in the Milky Way Galaxy
(C) NASA/ESA, A. Feild (STScI) and the Hubble Heritage Team (AURA/STScI).
This diagram shows the location of V838 Mon in the Milky Way Galaxy.

V838 Mon V838 Mon
V838 Mon
(C) NASA, ESA
V838 Mon
(C) NASA, ESA
V838 Mon V838 Mon
V838 Mon
(C) NASA, ESA
V838 Mon
(C) NASA, ESA
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V838 Mon (Variable Star) : Movie

V838 Light Echo: The Movie

A Flash of Brilliance: Hubble's Universe Unfiltered
In 2002, star V838 Monocerotis brightened dramatically in a mysterious outburst, allowing Hubble to capture a series of images of the dust and gas around the star.
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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。
いっかくじゅう座. (2013, November 24). In Wikipedia.
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