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Topic: V838 Monocerotis

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	V838 Monocerotis - Wikipedia, the free encyclopedia
		Observations have indicated that V838 Mon is a binary system where one of the stars somehow transformed itself over a period of months from a small under-luminous star a little hotter than the Sun, to a highly-luminous, cool supergiant star -- defying the conventional understanding of erupting stars and stellar life cycles.
		V838 Monocerotis as imaged by the Hubble Space Telescope on December 17, 2002
		The V838 Mon - dust - Earth path length is increasing at the speed of light, and the visible echo is simultaneously receding both from V838 Mon and from the Earth.
	en.wikipedia.org /wiki/V838_Monocerotis (453 words)

	V838 Monocerotis
		Observations have indicated that V838 Mon somehow transformed itself over a period of months from a small under-luminous star a little hotter than the Sun, to a highly-luminous, cool supergiant star -- defying the conventional understanding of erupting stars and stellar life cycles.
		In this spectacular image, one of a series recorded last year by the Hubble Space Telescope, the dimmed V838 Mon is surrounded by an "expanding" nebula.
		V838 Monocerotis is named after the constellation Unicorn, latin Monoceros.
	www.ebroadcast.com.au /lookup/encyclopedia/v8/V838_Monocerotis.html (207 words)

	Monoceros - Wikipedia, the free encyclopedia
		Beta Monocerotis is an impressive triple star system, the three stars form a triangle which seems to be fixed.
		S Monocerotis, or 15 Monocerotis, is a bluish white variable star and is located at the center of NGC 2264.
		V838 Monocerotis had an outburst starting on January 6, 2002.
	en.wikipedia.org /wiki/Monoceros (411 words)

	[astroCS] Conference on V838 Monocerotis (fwd) (Site not responding. Last check: 2007-11-04)
		V838 Mon progenitor must have been massive and young, given the presence of a normal B3V companion.
		The spectral evolution of V838 Mon was as peculiar as its light curve.
		Besides this, V838 Mon became one of the major attractions in stellar astrophysics over the last few years by displaying a 2 arcmin wide bright circumstellar light-echo, the first one seen in our Galaxy in the last 70 years.
	www.ta3.sk /cgi-bin/toUTF8.cs/pipermail/astrocs/2005q3/000312.html (651 words)

	AAVSO: V838 Mon, Dec 2002 Variable Star Of The Month
		When V838 Mon emerged from behind the Sun in November the light echo was large enough that amateurs could get into the act.
		The progenitor object for V838 Mon was likely an F class main sequence star (with a temperature around 6650° C [12,000° F]) and hovering around V=15.6 mag.
		V838 Mon is going down as one of the strangest and most interesting stars discovered.
	www.aavso.org /vstar/vsots/1202.shtml (1969 words)

	V838 Monocerotis
		They determine the position of V838 Mon by using 16 reference stars in the USNO A1.0 astrometric catalog, and their own CCD image of the area, with the K-585 array on the 1-meter Zeiss telescope.
		While the distance to V838 Mon might be in doubt, the location & nature of the star before it went into outburst, the progenitor star, seems to be much less controversial.
		From 1949 to 1994, V838 Mon did not vary by more than ±0.4 magnitudes, from a mean of 15.85, in the B band.
	www.tim-thompson.com /v838mon.html (1671 words)

	V838 Monocerotis: Stern erzeugt spektakuläres Lichtecho
		V838 Monocerotis in der Konstellation Einhorn hatte seine Sternstunde von der Erde aus gesehen im Januar des vergangenen Jahres: Damals entwickelt der bis dahin unauffällige Gasball für kurze Zeit die 600.000-fache Leuchtkraft unserer Sonne.
		The Hubble telescope has imaged V838 Mon and its light echo several times since the star's outburst in January 2002, in order to follow the constantly changing appearance of the dust as the pulse of illumination continues to expand away from the star at the speed of light.
		This we interpret as an evidence that the main energy source during decline was due to gravitational contraction of the object envelope inflated in eruption.
	hera.ph1.uni-koeln.de /~heintzma/Sp4/S201.htm (1854 words)

	HubbleSite - Flash From Star V838 Monocerotis Echoes Through Space - Image - 2/3/2005
		The dust surrounding V838 Mon may have been ejected from the star during a previous explosion, similar to the 2002 event.
		V838 Mon is located about 20,000 light-years away from Earth in the direction of the constellation Monoceros, placing the star at the outer edge of our Milky Way galaxy.
		The new image of V838 Mon, taken in October 2004 with Hubble's Advanced Camera for Surveys, was prepared from images obtained through filters that isolate blue, green, and infrared light.
	hubblesite.org /newscenter/newsdesk/archive/releases/2005/02/image/a (665 words)

	News - "The Strangest Star We Have Ever Observed"
		The star is called V838 Monocerotis because it is the 838th variable star discovered in the constellation Monocerotis, the unicorn.
		V838 Mon is about 20,000 light-years from Earth (117 quadrillion miles), which means the explosion actually took place 20,000 years ago in the late Paleolithic period, long before human civilization.
		V838 became so bright that for a few days it was the brightest star in the Milky Way.
	www.aero.org /news/newsitems/star-052603.html (659 words)

	APOD: 2004 March 5 - V838 Mon: Echoes from the Edge (Site not responding. Last check: 2007-11-04)
		Still, ever since a sudden outburst was detected in January 2002, this enigmatic star has taken the center of an astronomical stage while researchers try to understand where it fits into the picture of
		As light from the stellar flash echoes across pre-existing dust shells around V838 Mon, its appearance changes dramatically.
		Astronomers expect the expanding echoes to continue to light up the dusty environs of V838 Mon for at least the rest of the current decade.
	antwrp.gsfc.nasa.gov /apod/ap040305.html (187 words)

	ESA Portal - Hubble watches light echo from mysterious erupting star
		The brightness of V838 Monocerotis, as astronomers call the star, has long since returned to normal levels.
		V838 Monocerotis's outburst was somewhat similar to that of a nova, a more common stellar outburst.
		A typical nova is a normal star that dumps hydrogen onto a compact, white dwarf companion star.
	www.esa.int /export/esaCP/SEMYZ09YFDD_index_0.html (603 words)

	BBC NEWS \| Science/Nature \| Star devours planets
		Last year, the usually well behaved star V838 Monocerotis dramatically brightened three times, and astronomers were at a loss to explain why.
		V838 Monocerotis is located about 20,000 light-years away in the constellation Monoceros (the Unicorn).
		The researchers say that V838 Monocerotis flared because it was fuelled as it engulfed three orbiting planets.
	news.bbc.co.uk /1/hi/sci/tech/3113468.stm (367 words)

	ESA Science & Technology: V838 Monocerotis revisited: Space phenomenon imitates art [heic0405]
		The illumination of interstellar dust comes from the red supergiant star at the middle of the image, which gave off a flashbulb-like pulse of light two years ago.
		V838 Mon is located about 20 000 light-years away from Earth in the direction of the constellation Monoceros, placing the star at the outer edge of our Milky Way galaxy.
		The star has some similarities to a class of objects called "novae", which suddenly increase in brightness due to thermonuclear explosions at their surfaces; however, the detailed behaviour of V838 Mon, in particular its extremely red colour, has been completely different from any previously known nova.
	hubble.esa.int /science-e/www/object/index.cfm?fobjectid=34790 (570 words)

	V838 Mon
		Now a meager 16th-magnitude star, V838 Monocerotis (V838 Mon) was for a short time intrinsically brighter than any other star in our entire galaxy.
		According to a group of observers who studied the star's spectra with the United Kingdom Infrared Telescope in Hawaii, V838 Mon appears to be the coolest super giant ever seen.
		V838 Monocerotis has all the basic characteristics of fissioning to relieve electrical stress: nova-like brightening followed by loss of luminosity and loss of temperature; changing to a different spectral type with marked changes in its surface chemical composition; discovery of a binary companion; and the appearance of an expanding nebulous cloud.
	www.thunderbolts.info /tpod/2004/arch/040809v838-mon.htm (543 words)

	LSU Physics and Astronomy - Events/General Seminars (Site not responding. Last check: 2007-11-04)
		The most spectacular light echo in history is occurring now around the previously unknown star V838 Monocerotis, and is being imagedregularly by the Hubble Space Telescope.
		The light echo around V838 Mon, which had a sudden outburst in early 2002, leads to direct geometric determinations of the distance to the star and a fully 3-dimensional map of the dust distribution around it, both of these for the first time for any star in the Milky Way.
		The resulting distance shows that V838 Mon was temporarily one of the brightest stars in the entire Milky Way, and moreover its outburst was of a type not seen before, thus posing a severe puzzle to stellar theoreticians.
	www.phys.lsu.edu /dept/events/abbond.html (211 words)

	APOD: 2002 October 3 - V838 Mon: Mystery Star (Site not responding. Last check: 2007-11-04)
		At a distance of about 8,000 light-years, V838 Mon was discovered to be in outburst in January of this year.
		Observations indicate that the erupting star transformed itself over a period of months from a small under-luminous star a little hotter than the Sun, to a highly-luminous, cool supergiant star undergoing rapid and complex brightness changes.
		Seen above in two separate images from the South African Astronomical Observatory's 1 meter telescope, the nebula is probably a light echo from shells of formerly unseen material lost by the star during its previous evolution.
	antwrp.gsfc.nasa.gov /apod/ap021003.html (225 words)

	SPACE.com -- Hubble Chronicles Mysterious Outburst with 'Eye-Popping' Pictures
		V838 Mon did not explosively eject its outer envelope, so it remained cool throughout the event, which was observed from April to December 2002.
		The surface of V838 Mon is about 3,600 degrees Fahrenheit (2,000 degrees Celsius), less than half that at the surface of the Sun.
		This material is thought to be racing away from the star, but not near as fast as the fresh burst of light that illuminates the dust and continually overtakes new regions of it to create the expanding light echo.
	www.space.com /scienceastronomy/light_echo_030326.html (1492 words)

	Ouroboros & the Cosmos
		The Variable star V838 Monocerotis lies near the edge of our Milky Way Galaxy, about 20,000 light-years from the Sun.
		Still, ever since a sudden outburst was detected in January 2002, this enigmatic star has taken the center of an astronomical stage while researchers try to understand where it fits into the picture of stellar evolution.
		Revealed in a sharp snapshot recorded in February by the Hubble's Advanced Camera for Surveys, this portion of the dust shell is about six light-years in diameter.
	www.wisdomportal.com /Ouroboros.html (729 words)

	V838 Monocerotis - Bad Astronomy and Universe Today Forum
		I finally found the reason why V838 Mon is thought to be lighting up previously expelled layers.
		Also V838 Mon is a binary system, and I would be curious to know if this fact was known before the "eruption".
		Don Scott has explained what happened to V838 Mon using the Electric Model and it can be found at http://www.electric-cosmos.org/hrdiagr.htm, it is in the section commenting on variable stars that falsify current theory.
	www.bautforum.com /showthread.php?t=21350 (1037 words)

	V838 Monocerotis revisited: Space phenomenon imitates art
		This image, obtained with the Advanced Camera for Surveys on 8 February 2004, is Hubble's latest view of an expanding halo of light around a distant star, named V838 Monocerotis (V838 Mon).
		Called a 'light echo', the expanding illumination of a dusty cloud around the star has been revealing remarkable structures ever since the star suddenly brightened for several weeks in early 2002.
		The Hubble Space Telescope has imaged V838 Mon and its light echo several times since the star's outburst in January 2002, in order to follow the constantly changing appearance of the dust as the pulse of illumination continues to expand away from the star at the speed of light.
	www.eurekalert.org /pub_releases/2004-03/esa-vmr030404.php (504 words)

	Image of the Day
		Like a flashbulb, a red giant star known as V838 Monocerotis lit up its environment about two years ago, and astronomers have been puzzling over snapshots taken ever since.
		This latest in a series of images by the Hubble Space Telescope shows the flash of light illuminating gas and dust farther from the star than had been seen in previous images as the light continues to race outward at, well, at the speed of light.
		Of course, because V838 Monocerotis is 20,000 light-years away, everything we're seeing now actually happened 20,000 years ago in the time frame of the star.
	www.space.com /imageoftheday/image_of_day_040304.html (357 words)

	V838 Monocerotis (Info)
		M31 RV (erupted in 1988), V4332 Sgr (erupted in 1994) and V838 Mon (erupted in 2002).
		Explanation: Expanding light echoes continue to illuminate the dusty environs of V838 Monocerotis, mysterious variable star near the edge of our Galaxy.
		Studies indicate the V838 Mon is a young binary system with a massive star responsible for the outburst.
	hera.ph1.uni-koeln.de /~heintzma/PN/IV_V838_Mon.htm (338 words)

	V838 Monocerotis: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-04)
		Observations have indicated that V838 Mon is a binary system where one of the stars somehow transformed itself over a period of months from a small under-luminous star a little hotter than the Sun A typical star that is the source of light and heat for the planets in the solar system
		But the nebula is actually a series of light echoes from formerly unseen shells of dust up to light-year[For more facts about this topic, click this link]s in diameter.
		The designation V838 Monocerotis means "838th variable star A star that varies noticeably in brightness
	www.absoluteastronomy.com /v/v838_monocerotis (887 words)

	ING Press Release 27/03/2003. SPECTACULAR VIEWS OF AN EXPLODING STAR (Site not responding. Last check: 2007-11-04)
		V838 Monocerotis erupted in January 2002 when in a few weeks its brightness increased by a factor of ten thousand.
		We know that V838 Monocerotis is actually a system composed of two nearby stars, whose vicinity is likely to affect the evolution of each other leading to catastrophic consequences like transfer of gas from one to the other.
		The Isaac Newton Group of Telescopes (ING) is an establishment of the Particle Physics and Astronomy Research Council (PPARC) of the United Kingdom, the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) of the Netherlands and the Instituto de Astrofísica de Canarias (IAC) in Spain.
	www.ing.iac.es /PR/press/ing22003.html (554 words)

	New Scientist Breaking News - Giant star caught swallowing three planets (Site not responding. Last check: 2007-11-04)
		The burst of light from V838 Monocerotis "echoed" outwards as it illuminated circumstellar dust.
		The star, known as V838 Monocerotis, is about 20,000 light years from Earth.
		The light analysed from V838 Monocerotis shows that after a short but gradual decline in luminosity following January's outburst, the star suddenly increased in brightness again in early February.
	www.newscientist.com /article.ns?id=dn4172 (543 words)

	Cosmology Curiosity: The mystery of V838 Monocerotis
		A leading candidate for the most mysterious star is variable star V838 Monocerotis (V838 Mon).
		Discovered in January 2002, V838 Mon transformed itself in a very short period from a small under-luminous star a little hotter than the Sun, to a highly-luminous, cool supergiant -- defying known mechanics of erupting stars and stellar life cycles.
		The illusion of expanding gas around V838 Mon is actually a 'light echo'.
	woodside.blogs.com /cosmologycuriosity/2006/04/the_mystery_of_.html (191 words)

	Catalogue: J/ApJ/598/L43
		We find that V838 Mon once again showed significant intrinsic polarization in 2002 October, suggesting the presence of an asymmetrical geometry of scattering material close to the star.
		Description: We obtained polarimetric measurements of V838 Mon and its field in 2002 October at the Cerro Tololo Inter-American Observatory (CTIO) 1.5m telescope.
		Note (1): The asterisk denotes a spectropolarimetric observation that did not span the entire wavelength range of the Johnson V filter; thus, the V-band polarization for this observation is only an estimate.
	cdsweb.u-strasbg.fr /viz-bin/Cat?J/ApJ/598/L43 (576 words)

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