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Topic: SN 1987A

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	SN 1987A - Wikipedia, the free encyclopedia
		Approximately three hours before the visible light from SN 1987A reached the Earth, a burst of neutrinos was observed at three separate neutrino observatories.
		Sanduleak -69° 202a, the progenitor star of SN 1987A, was a blue supergiant presumed to have a mass of about 18 solar masses.
		SN 1987A appears to be a core-collapse supernova, which should result in a neutron star.
	en.wikipedia.org /wiki/SN_1987A (649 words)

	Sn 920
		SN 1987A was a supernova in the Large Magellanic Cloud, a nearby dwarf galaxy.
		Approximately three hours before the visible light from SN 1987A reached the Earth, a burst of neutrinos was observed at three separate neutrino observatories (Kamiokande II, IMB and Baksan).
		SN 2004dj was the brightest supernova since SN 1987A at the time of its discovery.
	www.breadlike.com /pages7/80/sn-920.html (1061 words)

	Chandra :: Photo Album :: Supernova 1987A (SN1987A) :: 11 May 00
		Recent optical observations of SN 1987A with the Hubble Space Telescope have revealed gradually brightening hot spots from a ring of matter that was ejected by the star thousands of years before it exploded.
		SN 1987A is in the Large Magellanic Cloud, a nearby galaxy that is 160,000 light years from Earth.
		Although SN 1987A was a spectacularly violent event, we are watching it from a very safe distance.
	chandra.harvard.edu /photo/2000/sn1987a (277 words)

	The SN 1987A Story
		The core-collapse process is believed to be the cause of the explosions of massive stars at the end of their lives, and SN 1987A provided strong experimental confirmation of this idea.
		SN 1987A is located at the edge of the Tarantula Nebula in the LMC,
		The study of the neighborhood of SN 1987A thus offers a unique opportunity to place the supernova explosion in the context of stellar evolution and the evolution of entire populations of stars.
	heritage.stsci.edu /1999/04/sn1987anino.html (1517 words)

	Measuring the Distance to Super Nova 1987A
		The first images of SN 1987A taken by the NASA/ESA Hubble Space Telescope were made using the ESA Faint Object Camera (FOC) on day 1278 after the outburst.
		The pictures of SN 1987A show three circular nebulae surrounding the supernova — an inner ring and two outer rings.
		The light curve for the ring of SN 1987A is shown.
	courses.ncssm.edu /kolena/astro/supernova1987Aproject.html (1115 words)

	Chandra :: Photo Album :: Supernova 1987A :: Supernova 1987A Animations
		This sequence shows how the X-ray emission from Supernova 1987A (known as SN 1987A) has brightened from 1999 to 2005.
		When a massive star explodes, as in the case of SN 1987A, it creates a shell of hot gas that glows brightly in X-rays.
		SN 1987A occurred in the Large Magellanic Cloud, a galaxy only 160,000 light years from Earth.
	chandra.harvard.edu /photo/2005/sn87a/animations.html (146 words)

	The X-ray lightcurve of SN 1987A (Site not responding. Last check: 2007-11-06)
		X-ray monitoring of SN 1987A in the Magellanic Clouds is being performed at regular intervals throughout the ROSAT mission.
		A significant increase of the X-ray flux from SN 1987A is observed, which goes hand in hand with the radio flux increase.
		In the meantime a large fraction of the bolometric luminosity of SN 1987A is emitted in X-rays.
	www.aip.de /~preprint/preprints/1997/1997_grh1.html (172 words)

	SN 1987A
		SN 1987A was a supernova in the outskirts of the Tarantula Nebula in the Large Magellanic Cloud, a nearby dwarf galaxy.
		It occurred approximately 51.4 kiloparsecs from Earth , close enough that it was visible to the naked eye.
		It was the closest supernova since SN 1604, which occurred in the Milky Way itself.
	www.kiwipedia.com /sk--69a-202.html (188 words)

	SN 1987A
		SN 1987A (marked by the cross-hairs) lies near the diffuse structure of the Tarantula nebula and the ring-like structure of supernova N157C.
		SN 1987A is one hundred thousand times fainter than the supernova in M81 shortly after the explosion.
		In the case of the supernova in M81, the exploding star was a blue giant.
	heasarc.gsfc.nasa.gov /docs/rosat/gallery/snr_1987a.html (109 words)

	Features of SN 1993J
		It is the brightest supernova visible in the northern hemisphere in the last 21 years and the second brightest only inferior to SN 1987A in the whole world.
		SN 1987K (Filippenko 1988) is the only other supernova to have behaved similarly with SN 1993J.
		The light curves of SN 1993J exhibit a rapid rise to a first maximum around March 28, a decline of about 1 week in all bands, a subsequent rise to a second maximum near April 19, and an exponential decline (Schmidt et al.
	www.pha.jhu.edu /~qzhang/seminar1bfigs/node9.html (626 words)

	Supernova Taxonomy
		It should be noted that SN 1987A had a fairly odd behavior (for fairly well understood reasons) and is certainly not a prototypical SN IIP.
		SN 1987A may be better classified as an SN IIpec.
		The SN IIpec 1987A was observed in the radio, but it probably would not have been observed at the distance of a few megaparsecs.
	rsd-www.nrl.navy.mil /7212/montes/snetax.html (1492 words)

	Supernova 1987a
		We have determined the distance to the SN 1987A by comparing the angular size of its circumstellar ring measured from an HST (Hubble Space Telescope) image...
		We present models for the hydrodynamics of the impact of the envelope of SN 1987A with its inner circumstellar ring and for the resulting X-ray spectra and light curves.
		We derive the ultraviolet-optical infrared (uvoir) bolometric luminosity evolution of SN 1987A....
	www.evolutionpages.com /SN1987a.htm (1823 words)

	Kinematics and 3-D Structure of the ISM in front of SN 1987A (Site not responding. Last check: 2007-11-06)
		We are continuing to study the structure of the approximately 2\times10^8 cubic light years of the interstellar medium (ISM) in the Large Magellanic Cloud illuminated by the light echoes from SN 1987A.
		These are seen neither in absorption towards SN 1987A, nor yet in the light echoes, hence are probably behind the SN.
		This may suggest that the SN acquired its velocity while being formed in the collapse of the giant superbubble, which may have also created N157C.
	www.aas.org /publications/baas/v27n4/aas187/S045008.html (407 words)

	Supernova 1987A in the Large Magellanic Cloud
		SN type II The star Sanduleak -69 202, out about 169,000 light years in the Large Magellanic Cloud, ended its life in a firy spectacle about 167,000 B.C. (give or take up to a few 1000 years).
		Supernova 1987A was the nearest observed supernova since Kepler's Supernova of 1604, which occured before the invention of the telescope.
		Supernova 1987A, peculiar and of type II, was one of the most interesting objects for the astrophysicists in the 1980s (some even say of this century).
	www.seds.org /messier/xtra/ngc/lmc_sn1987A.html (328 words)

	Spectral Evolution
		Figure 5: Spectra of Type II SN 1987A in the Large Magellanic Cloud, obtained from the photospheric phase to the nebular phase.
		The case of SN 1992A is shown in figure 6.
		Data on SN 1987M supports that SNe Ic are closely related to SN Ib events despite the distinct spectral differences in the early time spectra.
	www.pha.jhu.edu /~qzhang/seminar1bfigs/node8.html (1124 words)

	Why did the supernova change colors?
		SN 1993J was seen to be one kind of massive explosion, but then seemed to morph into a distinctly different kind.
		But SN 1993J is a transition object which had lost most, but not all, of its hydrogen envelope.
		Already, SN 1993J has stirred interest among astronomers using radio and optical telescopes, and the few X-ray telescopes now in orbit have found a number of intriguing details.
	science.nasa.gov /newhome/headlines/features/ast09sep98_1.htm (1497 words)

	LMC SNRs: SN 1987A (Site not responding. Last check: 2007-11-06)
		SN 1987A has recently encountered the wall of the stellar "bubble" formed by its progenitor.
		As of this encounter and subsequent brightening, it may be considered a supernova remnant, the newest in the LMC sample.
		SN 1987A is to the upper right of the image.
	www.astro.uiuc.edu /projects/atlas/snrprofiles/SN1987A.html (81 words)

	Supernovas
		When supernova SN 1987a was spotted on February 24, 1987 this streak was broken.
		With telescopes at the European Southern Observatory (the largest observatory of the southern hemisphere), on top of the La Silla mountain in Chili, the Canadian astronomer, Ian Shelton, discovered a new star in the Cloud of Magelhaese: the Supernova SN 1987a.
		SN 1987a appeared to have originated from a blue giant, which was contrary to scientists' hypothesis.
	library.thinkquest.org /28327/main/astronomy/supernova.html (403 words)

	SN 1987a in the Large Magellanic Cloud
		Glittering stars and wisps of gas create a breathtaking backdrop for the self-destruction of a massive star, called supernova 1987A, in the Large Magellanic Cloud, a nearby galaxy.
		This three-color image is composed of several pictures of the supernova and its neighboring region taken with the Wide Field and Planetary Camera 2 in Sept. 1994, Feb. 1996 and July 1997.
		SN 1987A, Large Magellanic Cloud, LMC, IRAS 05240-6948
	www.spacetelescope.org /bin/images.pl?string=opo9904a (114 words)

	What's Happening: Spitzer Spots Building Blocks of Life in Supernova Remnant
		This is new territory for astronomers, said Bouchet, whose research team made infrared observations of SN 1987A with the Gemini South telescope in Chile.
		Through high-resolution infrared imaging with the 8-meter Gemini South telescope, the science team determined that the dust is in the region of the equatorial ring of gas around SN 1987A.
		A star as massive as the one that blew apart in SN 1987A likely produced more silicate dust in the years before the supernova.
	www.spitzer.caltech.edu /Media/happenings/20060714/index.shtml (920 words)

	SPACE.com -- Core of Supernova Goes Missing
		It may be too soon to see radio flashes from the remnant of SN 1987A, since theory predicts that pulsars take between 100 to 100,000 years to develop after a supernova.
		Future observations may uncover this quiet remnant by studying the infrared emission from dust clouds in the vicinity, which may be reprocessing the weak ultraviolet and visible light coming from the neutron star.
		The progenitor of SN 1987A is right near the dividing line, so it may have created a fl hole.
	www.space.com /scienceastronomy/050606_missing_core.html (473 words)

	USATODAY.com - New life in dead star: Supernova 'changing right before our eyes' (Site not responding. Last check: 2007-11-06)
		A star as massive as the one that created SN 1987A was thought to produce much more dust.
		A spate of new infrared, optical and X-ray observations of SN 1987A are now planned to follow up on the new findings.
		This image of SN 1987A combines data from NASA's orbiting Chandra X-ray Observatory and the 8-meter Gemini South infrared telescope in Chile.
	www.usatoday.com /tech/science/space/2006-07-24-supernova-dust_x.htm (712 words)

	SN1987A (Professor Arlin Crotts at CAL)
		``The Circumstellar Envelope of SN 1987A, I: The Shape of the Double-lobed Nebula and Its Rings, and the Distance to the LMC'' Crotts, A.P.S., Kunkel, W.E. and Heathcote, S.R. 1995, Ap.
		``The Shape of SN 1987A's Circumstellar Nebula (and The Distance to the LMC)'' A.P.S. Crotts, W.E. Kunkel, S.R. Heathcote and E.L. Blanton 1994, Bulletin A.A.S., 25, 1350.
		``The Circumstellar Envelope of SN 1987A: Mass Loss from the Progenitor and the Analogy to Planetary Nebulae'' A.P.S. Crotts 1995, Ann.
	www.astro.columbia.edu /~arlin/sn1987a.html (1030 words)

	HubbleSite - NewsCenter - Supernova Shock Wave Is Producing a Spectacular New Light Show (02/19/2004) - Introduction
		Called SN 1987A, the titanic supernova explosion blazed with the power of 100,000,000 suns for several months following its discovery on Feb. 23, 1987.
		Although the supernova itself is a million times fainter than 17 years ago, a new light show in the space surrounding it is just beginning.
		Astronomers, however, have not detected either object in Supernova 1987A, either because it does not exist or the debris is so dense that astronomers cannot see inside the material.
	hubblesite.org /newscenter/archive/releases/2004/09 (459 words)

	Spaceflight Now \| Breaking News \| First ever 'baby pictures' of infant supernova remnant
		A color image of SN 1987A made by combining data taken through blue, green and red filters with the Wide Field Planetary Camera 2 of the Hubble Space Telescope in February and September 1994 and March 1995.
		In this case the "baby" is the remains of Supernova 1987A, a stellar explosion discovered in February of 1987.
		The images are both confirming general theoretical expectations, yet providing several surprises as a cosmic "smoke ring" puffed off by a dying star is obliterated by a tremendous shock wave traveling at millions of miles per hour.
	www.spaceflightnow.com /news/n0206/07babypix (2372 words)

	GCTF - SN1987A and the Antiquity of the Universe
		This whole situation is described in The SN1987A Circumstellar Ring and the Distance to the Large Magellanic Cloud (A Homework Problem) by astronomer Richard McCray.
		(1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al.'s (1991) analysis to obtain a better determination of the distance to the supernova.
		Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to be d(LMC) = 52.0 ± 1.3 kpc, which corresponds to a distance modulus of m-M(LMC) = 18.58 ± 0.05.
	www.geocities.com /Athens/Thebes/7755/ancientproof/SN1987A.html (1250 words)

	Spaceflight Now \| Breaking News \| Evidence presented for new supernova explosion model
		This file image of SN 1987a was produced by the Hubble Heritage Team using data collected by Robert Kirshner (Harvard/CfA), Nino Panagia (STScI), Martino Romaniello (ESO), and collaborators.
		However, those models created remnants that were essentially spherical, as opposed to the asymmetric ejecta seen from SN 1987a.
		SN 1987a is the first supernova remnant where such asymmetries have been directly observed, although this is primarily because the supernova, located in the Large Magellanic Cloud 168,000 light-years from the Earth, is the closest supernova to the Earth in several hundred years and thus the easiest to observe.
	spaceflightnow.com /news/n0101/09supernova (722 words)

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