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	Omega Centauri (NGC 4139)
		A 1999 study suggested that the stars of Omega Centauri did not all form at once but rather over a 2-billion-year period, with several starburst peaks — the first evidence of multiple populations in a globular cluster.
		The team who carried out this work speculated that this result may indicate that Omega Centauri is the remnant of the nucleus of a small galaxy that merged with our Milky Way.
		Omega Centauri was listed in Ptolemy's catalogue as a star and given a stellar designation by Bayer.
	www.daviddarling.info /encyclopedia/O/OmegaCen.html (237 words)

	Globular Cluster Omega Centauri (NGC 5139) - Star Clusters - Digital Images of the Sky (Site not responding. Last check: 2007-10-22)
		As the stars in Omega Centauri are expected to have all the same age the basic parameter which controls their evolution and change of colour is the mass of the star.
		The age of Omega Centauri was estimated to 16 billion years, so it is one of the oldest objects in the universe.
		:Main-sequence CCD photometry of the globular cluster Omega Centauri, 1991MNRAS.250..314N
	www.allthesky.com /clusters/wcen.html (271 words)

	VLT First Light (Site not responding. Last check: 2007-10-22)
		Omega Centauri is the most luminous globular cluster in our Galaxy.
		It is a 10-minute exposure of the center of Omega Centauri and it demonstrates that the telescope is able to track continuously with a very high precision and thus is able to take full advantage of the frequent, very good atmospheric conditions at Paranal.
		When Omega Centauri is observed through a telescope, even a small one, it looks like a huge swarm of numerous stars, bound together by their mutual gravitational attraction.
	ecf.hq.eso.org /instruments/nicmos/sardinia/node5.html (831 words)

	Hubble Omega Centauri Photo
		Located some 17,000 light-years from Earth, Omega Centauri is a massive globular star cluster, containing several million stars swirling in locked orbits around a common center of gravity.
		Omega Centauri is so large in our sky that only a small part of it fits within the field of view of the Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescope.
		Omega Centauri is the most luminous and massive globular star cluster in the Milky Way.
	www.spaceimages.com /omegacentauri.html (654 words)

	Multiwavelength Omega Centauri
		Omega Centauri is a globular star cluster in the constellation of Centaurus, and is the largest star cluster within our Milky Way Galaxy.
		Omega Centauri, also known as NGC 5139, has a total mass of about five million Suns, or roughly ten times as large as other large globular clusters.
		The radio emission, at this particular wavelength, is primarily due to synchrotron radiation emitted by massive blue stars undergoing the death throes of supernova explosions.
	coolcosmos.ipac.caltech.edu /cosmic_classroom/multiwavelength_astronomy/multiwavelength_museum/omegacen.html (713 words)

	NGC 5139 The Omega Centauri Star Cluster (Site not responding. Last check: 2007-10-22)
		Omega Centauri is the finest example of a globular star cluster in the sky.
		Early in the 17th century it was catalogued by Bayer as a star, which is why it was designated with the greek letter "Omega." It was not identified as a star cluster until 1677 by Halley (the same man for whom Halley's Comet is named).
		Omega Centauri contains more variable stars than any other known globular cluster, with the single exception of M3 in Canes Venatici.
	members.cox.net /sidleach/ngc5139.htm (178 words)

	SPACE.com -- Astronomers have used NASA's Hubble Space Telescope to peer into the center of a dense swarm of stars ...
		Omega Centauri is about 17,000 light-years from Earth and is the most luminous and massive globular star cluster in the Milky Way Galaxy.
		Omega Centauri is one of the few globular clusters that can be seen with the unaided eye.
		Named by Johann Bayer in 1603 as the 24th brightest object in the constellation Centaurus, it resembles a small cloud in the southern sky and might easily be mistaken for a comet.
	www.space.com /scienceastronomy/astronomy/omega_centauri_011004.html (689 words)

	pr-11-94.html (Site not responding. Last check: 2007-10-22)
		Omega Centauri, as this object is called, is the brightest of its type in the sky.
		Despite the faintness of the stars in Omega Centauri, CORAVEL is able to measure their velocities with a typical uncertainty of only 0.7 km/sec.
		PHOTO CAPTION ESO PR PHOTO 11/94-1: OMEGA CENTAURI: HEAVYWEIGHT GLOBULAR CLUSTER This photo of Omega Centauri, the brightest and largest globular cluster in the sky, was obtained with the Danish 1.5 m telescope at the ESO La Silla observatory.
	www.eso.org /outreach/press-rel/pr-1994/pr-11-94_pf.html (930 words)

	Hubble Heritage
		Omega Centauri is a dense swarm of stars called a "globular cluster".
		Located some 17,000 light-years from Earth, Omega Centauri is a massive cluster, containing several million stars swirling in locked orbits around a common center of gravity.
		Although stellar collisions are infrequent, even in the densest part of the cluster's core, Omega Centauri is so old that many thousands of collisions have occurred over time.
	heritage.stsci.edu /2001/33/supplemental.html (390 words)

	sciforums.com - Omega Centauri
		Recent evidence indicates that Omega Centauri is by far the most massive of the about 150 known globular clusters in the Milky Way.
		Omega Centauri, cataloged as NGC 5139, spans about 150 light years across, lies about 15,000 light years away, and can be seen without visual aide toward the constellation of Centaurus.
		With the naked eye, Omega appears as a misty patch in the sky, shining at magnitude 3.7, and looking a little like the nucleus of a dim comet but without the tail.
	www.sciforums.com /showthread.php?t=6884 (425 words)

	In the Stars: Omega Centauri blues - (United Press International) (Site not responding. Last check: 2007-10-22)
		Omega Centauri seems to be an exception to this rule, however.
		In other words, not only are the Omega Centauri blues super-abundant in helium, but they also are burning in the wrong color range.
		When the supergiants among the Omega Centauri reds exploded -- within a few tens of millions of years -- they ejected helium-enriched matter that "polluted" the globular cluster, Bedin said.
	washingtontimes.com /upi-breaking/20050322-081525-3886r.htm (1018 words)

	Cosmic Voyage-The Online Resource for Amateur Astronomers (Site not responding. Last check: 2007-10-22)
		Omega Centauri, NGC 5139, is simply one of the most stunning objects in the heavens.
		Omega Cen achieves the haughty elevation of 7.5 degrees at culmination, barely clearing the treetops, when observed from my dark sky site outside Flagstaff.
		Omega Centauri appears nearly one full degree in diameter.
	members.aol.com /billferris/n5139.html (186 words)

	A tale of two populations
		Strangely, however, this seems not to be the case for the large southern globular cluster Omega Centauri.
		Omega Centauri is the galactic globular cluster with the most complex stellar population.
		In this sense, Omega Centauri is a very useful "laboratory" for better understanding the history of star formation.
	www.eurekalert.org /pub_releases/2005-03/eso-at031505.php (1485 words)

	RedOrbit - Reference Library (Site not responding. Last check: 2007-10-22)
		In 1999, a team led by Young-Wook Lee of Yonsei University, South Korea, obtained a color-magnitude diagram (CMD) for 50,000 member stars of Omega Centauri with the 0.9-m telescope of CTIO in Chile.
		The team who carried out this work speculates that this result may indicate that Omega Centauri might be the remnant of a nucleus of a small galaxy which has merged with our Milky Way.
		Omega Centauri had been listed in Ptolemy's catalog as a star.
	www.redorbit.com /education/reference_library?article_id=54 (359 words)

	[No title]
		The Omega Centauri contains more than a million stars, and the details show how stars exist today and most likely evolved over time.
		Omega Centauri belongs to the constellation Centaurus, well-known because of Alpha Centauri and one of its companions, Proxima Centauri, the closest star outside of our solar system.
		Omega Centauri is not a recent discovery, either.
	www.dushkin.com /text-data/weekly/as10-22-01.mhtml (632 words)

	The dynamical distance and intrinsic structure of the globular cluster Omega Centauri / Events & Calendar / CITA (Site not responding. Last check: 2007-10-22)
		In many aspects omega Centauri is a unique globular cluster.
		For the first time, we have constructed anisotropic axisymmetric dynamical models for omega Centauri that simultaneously fit proper motion and line-of-sight velocity observations of its stars.
		This shows that omega Centauri is clearly not isotropic and reveals substructure in its distribution function.
	www.cita.utoronto.ca /index.php/events_calendar/the_dynamical_distance_and_intrinsic_structure_of_the_globular_cluster_omega_centauri (210 words)

	May's Star of the Month: Spica (Site not responding. Last check: 2007-10-22)
		Spica serves as your guide star to the Omega Centauri globular star cluster, probably the most celebrated star cluster in all the heavens.
		Unlike another southern treaure, the Southern Cross, Omega Centauri is far more accessible from temperate northern latitudes, if you know when and where to look.
		Spica and Omega Centauri are highest around midnight in early May and ten o'clock at the month's end.
	www.idialstars.com /spi.htm (285 words)

	Event Horizon Volume 3 6 The Hunt for Red Omega (Site not responding. Last check: 2007-10-22)
		This month and next are optimal times to see the Great Omega Centauri, probably the finest globular cluster of all.
		At this spot Omega Centauri will reach a maximum altitude of 1.5 degrees, remaining in view for about 40 minutes.
		For our friends "down-under" will attest, Omega Centauri is normally a bright object of magnitude 3.7, but at only 1.5 degrees above the horizon, it will only shine at 6.3 (assuming the atmosphere is transparent and steady).
	amateurastronomy.org /Events/EH364.html (354 words)

	OmegaCentauri
		Omega Centauri (NGC 5139) is the largest of the Globular Clusters in our sky.
		Sphereical in shape, it is comprised of more than a million stars.
		Please note: Omega Centauri rises to a total of less than 9 degrees elevation above the southern horizon where this photo was taken.
	www.homestead.com /sky4me/OmegaCentauri.html (100 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		ADC Dataset: J/AJ/119/1824 -- CCD photometry of the globular cluster {omega} Centauri.
		Dataset: J/AJ/119/1225: Stroemgren photometry of Omega Centauri (Hughes+, 2000)
		Dataset: J/PASP/106/828: BVRI photometry of Omega Cen (Walker 1994)
	archive.astro.umd.edu /archive/journals/AJ/119/1824 (264 words)

	NGC 5139 - Omega Centauri
		Study of red giant branch stars in Omega Centauri by a team of astronomers using the 0.9-meter telescope at Cerro-Tololo Interamerican Observatory in Chile (Lee et al.
		The team who carried out this work speculates that this result may indicate that Omega Centauri might be the remnant of a nucleus of a dwarf galaxy which has merged with our Milky Way.
		Lee, Y.-W., Joo, J.-M., Sohn, Y.-J., Rey, S.-C., Lee, H.-c., and Walker, A. The Globular Cluster Omega Centauri: A Relic of a Galactic Building Block.
	www.peripatus.gen.nz /Astronomy/objNGC5139.html (369 words)

	What Joanne is doing...
		Hughes, J., Wallerstein, G., and van Leeuwen, F. "Photometric Observations of Omega Centauri: Multi-Wavelength Observations of Evolved Stars," "Omega Centauri: a Unique Window into Astrophysics", ASP Conf.
		Wallerstein, G., and Hughes, J. "Age and Metallicity Effects in Omega Centauri: Stromgren Photometry at the Main Sequence Turn Off," in the Proceedings of the 35th Liège International Astrophysics Colloquium, "The Galactic Halo: From Globular Clusters to Field Stars," Eds.
		Hughes, J., and Wallerstein, G. (1998), "Age and Metallicity Effects in Omega Centauri I: Stromgren Photometry," AAS 193.6809.
	www.astro.washington.edu /hughes (687 words)

	Rich Neuschaefer; From Coe, Omega Centauri and Centaurus A (Site not responding. Last check: 2007-10-22)
		Last Saturday (Mar. 1st), at Coe, several of us were up late enough to see Omega Centauri and Centauarus A. I found Omega Centauri with my Orion 15x63 binocular and then found it with my AP 155EDFS.
		Omega Centauri was a large, bright, round, unresolved spot in my 6" scope.
		With Iota Centauri transiting, Omega Centauri is almost straight down from Iota.
	observers.org /reports/2003.03.01.21.html (226 words)

	Best of AOP: NGC 5139: Omega Centauri
		The name "Omega Centauri" should hint that this particular cluster is quite special.
		As viewed from Earth, Omega Cen (as it is often called) is certainly one of the most dazzling of globular clusters that orbits our galaxy.
		Interestingly, Omega Cen is one of the few clusters that is currently passing directly through the plane of our galaxy.
	www.noao.edu /outreach/aop/observers/n5139.html (233 words)

	RSAA - News - Media Releases
		An ANU graduate student who believes the spectacular Omega Centauri star cluster is not all it seems will challenge prevailing wisdom at the General Assembly of the International Astronomical Union in Sydney today.
		Laura Stanford thinks that Omega Centauri may be the pitiful remnant of a once enormous galaxy that has been ripped to pieces by the gravity of our own galaxy, the Milky Way.
		"We are beginning to think Omega Centauri is not a normal star cluster at all, but that perhaps it was once the centre of a whole galaxy, one hundred times bigger than the cluster is now.
	msowww.anu.edu.au /news/media_releases/media_release_030716.php?p=1 (442 words)

	Omega Centauri, NGC 5139 (Site not responding. Last check: 2007-10-22)
		To the unaided eye this glorious globular cluster has the appearance of a hazy star and was frequently confused with Halley's comet when it drifted through Centaurus in 1986.
		One of the richest in the Milky Way, Omega Cen contains several million stars, but unlike its southern rival, 47 Tucanae, it has a relatively open structure.
		Like most galactic globular clusters, the stellar population of Omega Cen identifies it as one of the oldest objects associated with the Milky Way, indeed its age is comparable to that of the Universe itself.
	www.aao.gov.au /images/captions/aat089.html (182 words)

	A Tale of Two Populations (ESO Press Release 07/05)
		Caption: ESO PR Photo 08b/05 shows the two distinct populations of stars present in the globular cluster Omega Centauri, recognisable in this colour-brightness diagram that is based on data obtained via the HST image shown in ESO PR photo 08a/05.
		Caption: ESO PR Photo 08c/05 presents average spectra of the blue and red stellar populations in the globular cluster Omega Centauri.
		It is possible that the total mass of Omega Centauri was just right to allow the material expelled by high-mass supernovae to escape, while the matter from explosions of stars with about 10-12 times the mass of the Sun was retained.
	www.eso.org /outreach/press-rel/pr-2005/pr-07-05.html (1652 words)

	NGC 5139, Omega Centauri
		NGC 5129 is the largest and most spectacular globular cluster in the entire night sky, and the largest in our galaxy.
		At 36 arc minutes, Omega Centauri is larger than the full moon in apparent size.
		It is located about 17,000 light years away from our Sun and at 4th magnitude, is easily visible without a telescope as a "star" in the constellation of Centaurus.
	www.astropix.com /HTML/C_SPRING/OMEGACEN.HTM (200 words)

	DOC NGC 5139 Omega Centauri (Site not responding. Last check: 2007-10-22)
		He wrote of it as "the noble globular cluster w Centauri, beyond all comparison the richest and largest object of its kind in the heavens.
		This explanation of an appearance often noticed in the descriptions of such clusters, is corroborated in this instance by the distribution of these appearently larger stars in rings or mesh-like patterns, chiefly about the centre where the stars are most crowded.
		FitzGerald, A.P. "Note on the globular cluster Omega Centauri", IAJ, Vol 3, 204.
	www.saao.ac.za /assa/html/doc_ngc_5139_omega_centauri.html (1106 words)

	Abundances in Three Heavy-Element Stars in $\omega$ Centauri (Site not responding. Last check: 2007-10-22)
		The abundances of the iron-peak elements Fe, Ni and Ti, the $\alpha$ elements Mg, Al and K and the s-process elements Rb, Y and Zr are determined for the heavy-element stars ROA 371, ROA 5293 and ROA 3812 in the globular cluster $\omega$ Centauri.
		This places ROA 371 in the middle of the range of metallicities found for giant branch stars in $\omega$ Cen by Brown et al.
		This result is in agreement with the interpretation of the positions of these three stars in the color-magni tude diagram of $\omega$ Cen made by Lloyd Evans (1983, MNRAS, 204, 975).
	www.aas.org /publications/baas/v25n2/aas182/abshtml/S5009.html (246 words)

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