File:Evolution of the light echo around V838 Monocerotis (Heic0617a).ogv
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Summary
[edit]DescriptionEvolution of the light echo around V838 Monocerotis (Heic0617a).ogv |
English: The unusual variable star V838 Monocerotis (V838 Mon) continues to puzzle astronomers. This previously inconspicuous star underwent an outburst early in 2002, during which it temporarily increased in brightness to become 600,000 times more luminous than our Sun. Light from this sudden eruption is illuminating the interstellar dust surrounding the star, producing the most spectacular "light echo" in the history of astronomy.
As light from the eruption propagates outward into the dust, it is scattered by the dust and travels to the Earth. The scattered light has travelled an extra distance in comparison to light that reaches Earth directly from the stellar outburst. Such a light echo is the optical analogue of the sound echo produced when an Alpine yodel is reflected from the surrounding mountainsides. The NASA/ESA Hubble Space Telescope has been observing the V838 Mon light echo since 2002. Each new observation of the light echo reveals a new and unique "thin-section" through the interstellar dust around the star. The numerous whorls and eddies in the interstellar dust are particularly noticeable. Possibly they have been produced by the effects of magnetic fields in the space between the stars. The Hubble observations have been used to determine the distance to V838 Mon, using a technique based on the polarisation of the reflected light. Hubble has polarising filters that only pass light that vibrates at certain angles. This method yields a distance of 20,000 light-years for V838 Mon, suggesting that, during its outburst, V838 Mon was one of the brightest stars in the entire Milky Way. Although the reason for the eruption is still unclear, some astronomers have suggested it might have resulted from the collision of two stars.Čeština: Světlo uvolněné a rozptylované vzniklými prachovými částicemi po výbuchu proměnné hvězdy V838 Monocerotis v roce 2002 pozorované Hubbleovým vesmírným dalekohledem až do roku 2006.
Македонски: Развојот на светлината и растурањето на прашина по избувот на променливата ѕвезда V838 Еднорог. Снимено со вселенскиот телескоп „Хабл“ од 2002 до 2006 г.
Polski: Ekspansja echa świetlnego powstałego w wyniku odbicia światła wyemitowanego podczas wybuchu gwiazdy zmiennej V838 Monocerotis od otaczającego ją pyłu kosmicznego. Zjawisko obserwowane w latach 2002–2006 za pomocą Kosmicznego Teleskopu Hubble’a. |
Date |
between 2002 and 2006 date QS:P,+2002-00-00T00:00:00Z/8,P1319,+2002-00-00T00:00:00Z/9,P1326,+2006-00-00T00:00:00Z/9 |
Source | http://www.spacetelescope.org/videos/heic0617a/ |
Author | ESA/Hubble |
Assessment
[edit]This file was selected as the media of the day for 10 October 2017. It was captioned as follows:
English: Evolution of light and its dispersion on dust released after explosion of the variable star V838 Monocerotis in the year 2002 observed by Hubble Space Telescope until the year 2006.
Other languages
Čeština: Světlo uvolněné a rozptylované vzniklými prachovými částicemi po výbuchu proměnné hvězdy V838 Monocerotis v roce 2002 pozorované Hubbleovým vesmírným dalekohledem až do roku 2006. English: Evolution of light and its dispersion on dust released after explosion of the variable star V838 Monocerotis in the year 2002 observed by Hubble Space Telescope until the year 2006. Македонски: Развојот на светлината и растурањето на прашина по избувот на променливата ѕвезда V838 Еднорог. Снимено со вселенскиот телескоп „Хабл“ од 2002 до 2006 г. Polski: Ekspansja echa świetlnego powstałego w wyniku odbicia światła wyemitowanego podczas wybuchu gwiazdy zmiennej V838 Monocerotis od otaczającego ją pyłu kosmicznego. Zjawisko obserwowane w latach 2002–2006 za pomocą Kosmicznego Teleskopu Hubble’a.
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[edit]Public domainPublic domainfalsefalse |
This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag. |
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Author | European Space Agency |
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Short title | The evolution of the light echo around V838 Monocerotis |
Copyright holder | ESA/Hubble |
Usage terms | Public domain |
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