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Topic: Globular Cluster M80

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Globular cluster

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	Globular cluster
		A globular cluster is a cluster of stars that is spherical in shape and extremely dense towards its core.
		Globular clusters are usually composed of hundreds of thousands of old stars, similar to the bulge[?] of a spiral galaxy but confined to a volume of only a few cubic parsecs.
		Such globular clusters may be the former nuclei of galaxies that once orbited their host galaxy, but were totally engulfed and tidally stripped of their stars save for the dense nucleus.
	www.ebroadcast.com.au /lookup/encyclopedia/gl/Globular_cluster.html (379 words)

	Messier 80 - Wikipedia, the free encyclopedia
		Messier 80 (also known as M80 or NGC 6093) is a globular cluster in the constellation Scorpius.
		M80 is located midway between α Scorpii (Antares) and β Scorpii in a field in the Milky Way that is rich in nebulae.
		It is among the more densely populated globular clusters in the Milky Way Galaxy.
	en.wikipedia.org /wiki/Globular_Cluster_M80 (257 words)

	globular cluster
		Unlike open clusters and stellar associations, which are held together only weakly by gravity and contain Population I objects, globular clusters are tightly gravitationally bound collections of Population II stars.
		Further evidence that globular clusters are not necessarily relics of the earliest generations of stars in a galaxy comes from observations of galaxy collisions.
		One of the nearest globular clusters, M13 (the Great Cluster in Hercules), was the target for an early attempt at CETI, though whether planets exist within globulars clusters is still a matter of debate.
	www.daviddarling.info /encyclopedia/G/globclust.html (595 words)

	Learn more about Globular cluster in the online encyclopedia. (Site not responding. Last check: 2007-11-03)
		A globular cluster is a spherical bundle of stars that orbits a galaxy as a satellite.
		Globular clusters are fairly numerous; there are about 150 currently known globulars of the Milky Way (with perhaps 30-50 more undiscovered), and larger galaxies like Andromeda have more (Andromeda may have as many as 500).
		Globular clusters have a very high star density, and therefore close interactions and near-collisions of stars do sometimes occur.
	www.onlineencyclopedia.org /g/gl/globular_cluster.html (634 words)

	Star Clusters - Globular
		Globular clusters are not formed within the galaxy structure, but usually large numbers of them form a halo around the main galactic structure.
		Globular clusters usually require a larger telescope and higher magnification to observe to best effect, although the larger and closer ones can be spectacular in small instruments.
		Stellar concentration is average for a globular cluster and it is one of the metal-richest globulars.
	www.paulandliz.org /Star_Clusters/Globulars.htm (1802 words)

	Globular Star Clusters - Information and Observations
		Globular clusters are the senior citizens of our galaxy - they contain suns at least 12 billion years old.
		Summer nights are the best time to start hunting for globular clusters, almost one third of them are to be found in the summer constellation of Sagittarius.
		For your first observation of a globular cluster choose M13, the brightest cluster visible from the northern sky, teetering on the edge of naked-eye visibility and appearing as a small, hazy glow in binoculars.
	www.nightskyinfo.com /globular_clusters (661 words)

	PAS Intermediate
		Since these clusters are relatively near the center, it is not suprising that nearly 40 percent of the known ones, forty-nine, are located in either Ophiucus, Sagittarius or Scorpius.
		The clusters with the highest concentration of stars are classified as I while those with a very loose density with almost no central concentration are classified as XII at the other end.
		M22 would be the greatest such cluster for us to view from here were in not for the fact it is so low in the sky and it has all the foreground stars and dust to compete with near the Milky Way's galactic center.
	astronomical.org /astbook/intglobular.htm (1080 words)

	. : Crete Specialization Area Excursion : . - Margarita Petkova (Site not responding. Last check: 2007-11-03)
		Globular clusters are spherical conglomerations of stars that have about the same age and chemical composition.
		Unlike globular clusters, open cluster are situated in the galactic disk.
		Open clusters in the Milky Way are up to 100 million years old and globular clusters - up to 14 billions years old.
	www.faculty.iu-bremen.de /mbrueggen/MPetkova/cluster.html (232 words)

	Metallicity - Wikipedia, the free encyclopedia
		Stars in globular clusters are mainly older metal-poor members of population II In astronomy and physical cosmology, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium.
		They are common in the bulge near the centre of the galaxy, and in the galactic halo.
		Globular clusters also contain high numbers of Population II stars.
	en.wikipedia.org /wiki/Population_I (1474 words)

	Globular Cluster M 80
		Globular Cluster M 80 (which is also known as NGC 6093) is a globular cluster of stars some 28,000 lights years distant about 4o northeast of the star Antares toward the constellation Scorpius.
		Globular clusters are dense clusters of stars that are held together by their own mutual gravitational attraction.
		Globular clusters were formed early in the history of the Milky Way galaxy and are now among the oldest objects in the Universe––around 15 billion years old.
	www.astrographics.com /cgi-bin/affiliates/clickthru.cgi/getscience/www.astrographics.com/GalleryPrintsIndex/GP0046.html (244 words)

	Hubble Space Telescope, M80 (NGC 6093), globular star cluster
		This stellar swarm is M80 (NGC 6093), one of the densest of the 147 known globular star clusters in the Milky Way galaxy.
		Globular clusters are particularly useful for studying stellar evolution, since all of the stars in the cluster have the same age (about 15 billion years), but cover a range of stellar masses.
		M80 is also unusual because it was the site of a nova explosion in the year 1860.
	www.laughtergenealogy.com /bin/hubble/html/m80.html (506 words)

	Wikinfo \| Globular cluster
		It was through the study of globular clusters that the sun's position in
		Consequently, most of the known Milky Way globular clusters lie outside the galactic plane, as a globular cluster in the plane of the disk of the galaxy would not be seen because of dust in the way.
		It is not yet known whether globular clusters can naturally form later in the life of a galaxy, but it is likely their
	www.wikinfo.org /wiki.php?title=Globular_cluster (594 words)

	Scorpius (Site not responding. Last check: 2007-11-03)
		The cluster is quite distant, some 36,000 light years away, and it takes a very large telescope to study it in detail.
		This cluster is certainly worthy of being a Messier; while noticeable to the naked eye, binoculars resolve its various members.
		The cluster is only part of a much larger, very scattered, cluster called H 12, which is found one degree north.
	members.tripod.com /~TSingh/Ts/scorpius.htm (972 words)

	Sea and Sky's Astronomy Resources: Messier Objects M71 - M80
		This is an extremely loose cluster, and for some time there was doubt as to whether this was a globular cluster at all.
		At a distance of 60,000 light years, it is one of the the most remote globular clusters in the Messier catalog.
		This cluster has a diameter of around 90 light years and is located roughly 36,000 light years from the Earth.
	www.seasky.org /astronomy/astronomy_messier_71to80.html (1028 words)

	Globular Clusters (Site not responding. Last check: 2007-11-03)
		The globular star cluster M4 in Scorpius is one of the largest and nearest objects of its type.
		A view of the globular cluster M13 in Hercules, the finest cluster of its type in the northern half of the sky and one of the most spectacular telescopic objects in the heavens.
		M80 is a small but very bright globular cluster located a little more than 4 degrees NW of the star Antares.
	faculty.frostburg.edu /phys/latta/astronomy/globular.html (230 words)

	Astronomy CD ROM I - The Globular Cluster M80 (Site not responding. Last check: 2007-11-03)
		M80 is one of the densest of the 147 known globular star clusters in our Milky Way galaxy.
		Globular clusters are particularly useful for studying stellar evolution, since all of their stars have the same age (about 15 billion years), but cover a range of stellar masses.
		M80 is also unusual as it was the site of a nova explosion in the year 1860.
	astroa.physics.metu.edu.tr /~umk/ccd_wshop_adelman/Astronom/SC/S9926.HTM (373 words)

	M 80 (Site not responding. Last check: 2007-11-03)
		These stars are blue and bright stars which appear near the main-sequence of the Hertzsprung-Russell diagramm, and thus appear more massive and younger than the globular clusters age.
		Their large number in M80 indicates an exceptionally high stellar collision rate in the core of this globular cluster.
		Messier observed M80 on January 4th, 1781 "Nebula without a star in Scorpius,....." " This nebula is circular; the center is bright and resembles the nucleus of a small comet, surrounded by nebulosity.
	www.messiermarathon.com /new_page_86.htm (253 words)

	2.1 Globular cluster stars
		That there is a clearly visible turn-off point in the CMD for globular clusters is evidence for the roughly coeval nature of the stars in the cluster.
		During the early stages of the evolution of a globular cluster, most of the gas and dust has been swept away.
		Subsequent replenishment of the intercluster gas by stellar winds from evolved stars is removed during periodic passages of the cluster through the plane of the galaxy.
	relativity.livingreviews.org /Articles/lrr-2002-2/articlesu1.html (262 words)

	Globular cluster M80 (Site not responding. Last check: 2007-11-03)
		The globular cluster Messier 80 (NGC 6093) in Scorpius, shown from a 15-second V-band exposure with a Tektronix 2048x2048 CCD at the prime focus of the 4-meter Mayall telescope of Kitt Peak National Observatory.
		North is at the top and east to the left, for direct comparison with a chart or eyepiece view.
		M80 shows up in many pictures of the colorful Rho Ophuichi region, about 4 degrees NNW of M4 and free of most of the obscuration associated with the intricate dust clouds in this region.
	www.astr.ua.edu /gifimages/m80v.html (124 words)

	Messier Object 80
		Globular cluster M80 was one of the original discoveries of Charles Messier, who found it on January 4, 1781, and cataloged it as a "Nebula without a star,..
		A second nova occured in globular cluster M14 in 1938 but was only photographically observed, and found years later.
		In M80, however, investigations with the Hubble Space Telescope have lead to the detection of only two nova-like close binary stars, far fewer than expected theoretically, based on the stellar collision rate.
	www.seds.org /messier/m/m080.html (621 words)

	Scorpius
		Due west 1º (about half the distance to sigma Sco) is the bright globular cluster M4, while another globular cluster, M80, is 4º NNW of Antares.
		M80 (NGC 6093) is a rather faint, very compact, globular cluster in the vicinity of Antares, between this star and beta Scorpii, and more narrowly speaking, nearly midpoint between two 8th-magnitude stars (which are the brightest stars of the region).
		NGC 6231 is a naked-eye open cluster one half degree north of zeta Scorpii (which is in fact a member of the group).
	www.dibonsmith.com /sco_con.htm (1035 words)

	M80 Globular Star Cluster (Site not responding. Last check: 2007-11-03)
		M80 is a small but bright magnitude 7.3 globular star cluster.
		M80 was discovered by Charles Messier in January 1781 only about three weeks before Mechain independently discovered it.
		It is often overlooked because it is overshadowed by the nearby show piece globular cluster M4.
	members.cox.net /~k5xi/m80.htm (111 words)

	M80 Globular Cluster (Site not responding. Last check: 2007-11-03)
		This globular cluster was described by Sir William Herschel in 1785 as "the richest and most condensed mass of stars which the firmament can offer to the contemplation of the astronomer".
		Those are heady words but perhaps in his time, or in the Southern hemisphere, light pollution would not reduce it to a fuzzball as it appears from here and in this century.
		M80 lies at a distance of about 36,000 light years and is about 50 light years in diameter.
	schmidling.com /m80.htm (120 words)

	APOD Search Results for "globular cluster"
		Globular star clusters like M55 roam the halo of our Milky Way Galaxy as gravitationally bound populations of stars known to be much older than stellar groups found in the galactic disk.
		Quintuplet Cluster is one of the most massive open clusters yet discovered, but still much less massive than the ancient globular clusters that orbit in the distant halo.
		Globular clusters only 40 millions of years old can still be found in the neighboring LMC galaxy, though, but perhaps none so unusual as NGC 1850.
	antwrp.gsfc.nasa.gov /cgi-bin/apod/apod_search?globular+cluster (10845 words)

	M80: A Dense Globular Cluster
		M80, also known as NGC 6093, is one of about 250 globular clusters that survive in our Galaxy.
		Young stars would contradict the hypothesis that all the stars in M80 formed at nearly the same time.
		As blue stragglers are now thought to be due to stars coalescing, the collision and capture rate at the dense center of M80 must be very high.
	www.astronet.ru /db/xware/msg/apod/1999-07-07 (160 words)

	M80 Globular Cluster (Site not responding. Last check: 2007-11-03)
		On May 21, 1860, a nove occurred in M80, completely changing the appearance of this globular cluster for some days.
		This nova, also designated T Scorpii was discovered by Auwers at Berlin, had mag 7.0 on May 21 and 22, and faded to mag 10.5 on June 16.
		It was reported that Pogson had seen a rebrightening in early 1864, but this appears improbable, as nobody else could confirm this notion.
	www.ctaz.com /~dburns/m80.htm (132 words)

	Piet Hut: Astrophysics
		One reason to study globular clusters is the notion that it would seem unwise to attempt to understand something so complex as a galactic nucleus as long as you cannot understand the evolution of a globular cluster.
		Another reason to study globulars is related to the wealth of exotic objects they are now known to contain, such as blue stragglers, X-ray binaries, and millisecond pulsars.
		In fact, a globular cluster can be seen as an ecological network, where the overall distribution of stars dictates binary (trans)formation, while the binary stars in turn power the post-collapse expansion of the outer regions of the cluster.
	www.ids.ias.edu /~piet/act/astro (597 words)

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