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	NGC 6397
		A number of blue stragglers have been identified in NGC 6397 with masses two and occasionally three times as massive as the lower mass cluster stars otherwise present, supporting evidence for their formation from two and even three star collisions.
		A study of the motion of NGC 6397 has shown that the cluster passed through the galactic disk less than 5 million years ago.
		Age determinations for NGC 6231 are consistent with its formation at the time of or soon after the NGC 6397 disk crossing.
	www.daviddarling.info /encyclopedia/N/NGC_6397.html (287 words)

	IAAC Observations Matching Your Criteria
		(IAAC) Obj: NGC 6318 - Inst: Orion 6" Dob
		(IAAC) Obj: NGC 6522 - Inst: Orion 6" Dob
		(IAAC) Obj: SN 1999by in NGC 2841 - Inst: Meade LX10 8" SCT
	www.visualdeepsky.org /search.cgi?catalogs=NGC&ids=6397 (12507 words)

	Scientific FrontLine / Hubble sees faintest stars in a globular cluster
		The cluster NGC 6397 is one of the closest globular star clusters to Earth.
		NGC 6397 is 8,500 light-years away from Earth.
		NGC 6397 is currently estimated to be nearly 12 billion years old.
	www.sflorg.com /spacenews/sn081706_02.html (684 words)

	ASTRONOMERS FIND FIRST EVIDENCE FOR A NEW MEHCANISM FOR TRIGGERING STAR FORMATION
		NGC 6397 is currently about 1,500 light years below the Milky Way’s disk and is moving away from it.
		“Since NGC 6397 is about 250,000 times the mass of the Sun, it seemed reasonable that it may have had a noticeable effect on the Milky Way’s disk at the point of impact,” Rees continued.
		NGC 6231 is a very young star cluster, less than five million years old, in the disk of the Milky Way in the constellation Scorpius.
	www.physci.wsc.ma.edu /dept/aasrees/ngc6231press_release.htm (1231 words)

	NGC 6397 - Wikipedia, the free encyclopedia
		NGC 6397 is a globular cluster in the Ara constellation.
		NGC 6397 is one of the at least 20 globulars of our Milky Way Galaxy which have undergone a core collapse, meaning that its core has contracted to a very dense stellar agglomeration.
		In 2004, a team of astronomers (as cited in "References") focused on the cluster to estimate the age of the Milky Way.
	en.wikipedia.org /wiki/Globular_Cluster_NGC_6397 (248 words)

	Main-Sequence Binary Stars in the Core of NGC 6397
		Our upper limit of 5% to 7% on the total binary fraction in NGC 6397 is low relative to most previously published results for other clusters.
		Most notably, in the only other study of MS binaries in the core of a dense cluster (that we know of), Rubenstein and Bailyn (1997) have estimated the binary frequency in the core of NGC 6752 to be in the range 15% to 38%.
		We have isolated 81 main-sequence binary star candidates in the central region of the globular cluster NGC 6397 based on proper-motion membership and their locations in a CMD.
	www.cfa.harvard.edu /~abolton/poster6397/poster.html (2269 words)

	NGC 6397
		Globuar Cluster NGC 6397 is a dense cluster of stars located some 8200 light years away toward the constellation Ara.
		NGC 6397 is one of the at least 20 globular clusters in our Milky Way galaxy that have undergone core collapse, i.e.
		NGC 6397 is one of the nearest globular clusters.
	www.astrographics.com /GalleryPrintsIndex/GP0085.html (206 words)

	Hubble Heritage
		Four types of stars reside within the center of the globular cluster NGC 6397.
		The Chandra X-Ray satellite has a much different view of the center of the globular cluster NGC 6397.
		In this Chandra true-color X-Ray image the bright white sources (and the blue source on the right most edge) are cataclysmic variables, while the bright yellow source to lower center is a thermally emitting neutron star, in a quiescent low-mass x-ray binary.
	heritage.stsci.edu /2003/21/supplemental.html (346 words)

	Non-Messier NGC, IC, and other objects in this database
		NGC 2547, Lacaille III.2, considerable cluster in Vela
		NGC 3766, Lacaille III.7, considerable southern cluster in Centaurus
		NGC 4833, southern globular in Musca, Lacaille I.4
	www.seds.org /messier/xtra/ngc/ngc.html (953 words)

	ESO - 2004
		The first-ever measurement of the Beryllium content in two stars in a globular cluster (NGC 6397) - pushing current astronomical technology towards the limit - has made it possible to study the early phase between the formation of the first generation of stars in the Milky Way and that of this stellar cluster.
		The age of the stars in NGC 6397, as determined by means of stellar evolution models, is 13,400 ± 800 million years.
		Captions: ESO PR Photo 23b/04 identifies the two stars in the globular cluster NGC 6397 for which spectra were obtained with the UVES spectrometer on the VLT (at the centre of the fields shown).
	www.eso.org /outreach/press-rel/pr-2004/pr-20-04.html (2152 words)

	Astronomical Catalogues (Site not responding. Last check: )
		In 47 Tuc and NGC 6397, the dispersion profiles at first increase with decreasing radii but then flatten in the central 0.4'.
		A map of the average velocity in the central regions derived from the integrated light shows rotation for NGC 6397 and 47 Tuc.
		For 47 Tuc, NGC 6397, and M15, the amplitude of the projected rotation measured at a radius of 0.6' using the individual stellar velocities is equal to, or smaller than, that measured at a radius of 0.2' using the integrated light.
	adc.astro.umd.edu /cgi-bin/adc/cat.pl?/journal_tables/AJ/110/1699 (828 words)

	Observational evidence provides new theory on the formation of stars
		“Since NGC 6397 is about 250,000 times the mass of the sun, it seemed reasonable that it may have had a noticeable effect on the Milk Way’s disk at the point of impact,” Rees said.
		And, as NGC 6397 is one of the globular clusters closest to the Earth (approximately 7,500 light years away), it was possible to explore its motions in best detail, Cudworth said.
		The astronomers were able to estimate the youthfulness of the stars in NGC 6231, the new cluster, by their color and bright-ness, which according to theoretical calculations differ from those of older stars.
	chronicle.uchicago.edu /040205/stars.shtml (782 words)

	Oddities of Star Cluster NGC 6397 - Astronomy Science - Care2.com
		This star, a member of globular cluster NGC 6397, is noteworthy not just because it blinks, but because it blinks so fast and because its companion star is so atypical.
		Speculation holds that this might be a neutron star spun up to a rate of 274 rotations each second by the bloated red star it orbits.
		Other collisions near the center of NGC 6397 are thought to have produced other oddities -- blue straggler stars.
	www.care2.com /c2c/groups/disc.html?gpp=9395&pst=880471&archival=1 (204 words)

	Blue Stragglers In NGC 6397
		In fact, researchers have evidence that the row of six closely spaced blue stars just below the label in this Hubble Space Telescope image were formed when stars directly collided.
		Pictured is the central region of NGC 6397, a globular cluster about 6,000 light-years distant, whose stars all formed at about the same time.
		NGC 6397's massive stars have long since evolved off the main sequence, exhausting their central supplies of nuclear fuel.
	www.astronet.ru:8100 /db/xware/msg/apod/2000-06-22 (231 words)

	NGC 6397 (Site not responding. Last check: )
		Situated in Ara is one of the best globular clusters in the sky, NGC 6397.
		It is visible to the naked eye and is a very good object for small telescopes.
		NGC 6397 is believed to be one of the nearest globular clusters to the Earth.
	www.acad.carleton.edu /curricular/PHYS/Faculty/MClark/6397.htm (102 words)

	[No title] (Site not responding. Last check: )
		ADC Dataset: J/A+A/287/769 -- HST observations of the core of globular cluster NGC 6397 (1994)
		The core of the nearby and very concentrated globular cluster NGC 6397 has been imaged through the f/96-F140W, f/48-F140W, f/96-F210M and f/48-F220W ultraviolet filters of the Faint Object Camera on board the Hubble Space Telescope down to an ultraviolet limiting magnitude of ~19.
		We have computed the number of such collisions in the core of NGC 6397 and found it to be of the same order as the number of bright blue stragglers observed there.
	xml.gsfc.nasa.gov /archive/journals/A+A/287/769/index_long.html (307 words)

	NGC 6397
		This conspicuous globular is one of the two nearest to us (the other one is M4); currently it seems that M4 is a bit closer: M4 is at about 6,800 and NGC 6397 at 7,200 light years, but the uncertainty is large enough that the sequence may change..
		NGC 6397 is one of the at least 20 globulars of our Milky Way Galaxy which have undergone a core collapse, i.e.
		The HST has investigated globular cluster NGC 6397 for faint red dwarf stars, in order to check the abundance of these "Dark Matter" candidates.
	www.seds.org /messier/xtra/ngc/n6397.html (223 words)

	Main-Sequence Binary Stars in the Core of NGC 6397
		Our upper limit of 5% to 7% on the total binary fraction in NGC 6397 is low relative to most previously published results for other clusters.
		Most notably, in the only other study of MS binaries in the core of a dense cluster (that we know of), Rubenstein and Bailyn (1997) have estimated the binary frequency in the core of NGC 6752 to be in the range 15% to 38%.
		We have isolated 81 main-sequence binary star candidates in the central region of the globular cluster NGC 6397 based on proper-motion membership and their locations in a CMD.
	www.physics.sfsu.edu /~abolton/poster.html (2297 words)

	Messier Object 4
		Messier 4 (M4, NGC 6121) is one of the nearest globular clusters in the sky at an estimated distance of about 7,200 light years.
		Situated prominently about 1.3 degrees west of Antares, in constellation Scorpius, and being as bright as mag 5.6 visually, it can be detected by the naked eye under very dark skies, and is prominent with the slightest optical aid.
		Nearby (50' to the ENE) and even closer to Antares (only 30' NW), fainter globular cluster NGC 6144 (mag 10.4, 3.3' diamter) can be found; to observe it, Antares should be excluded from the field of view so that it cannot shine out that faint globular.
	www.seds.org /messier/m/m004.html (849 words)

	The O-Na and Mg-Al anticorrelations in turn-off and early subgiants in globular clusters (Site not responding. Last check: )
		for NGC 6397 and NGC 6752 respectively, where the first error bars refer to internal and the second ones to systematic errors (within the abundance scale defined by our analysis of 25 subdwarfs with good Hipparcos parallaxes).
		On the other hand, our results show clearly and for the first time that the O-Na anticorrelation (up to now seen only for stars on the red giant branches of globular clusters) is present among unevolved stars in the globular cluster NGC 6752, a more massive cluster than NGC 6397.
		A similar anticorrelation is present also for Mg and Al, and C and N. It is very difficult to explain the observed Na-O, and Mg-Al anticorrelation in NGC 6752 stars by a deep mixing scenario; we think it requires some non internal mechanism.
	aanda.u-strasbg.fr:2002 /articles/aa/abs/2001/13/aa10579/aa10579.html (289 words)

	The White Dwarf Cooling Sequence of NGC 6397 - Forums powered by UBBThreads™
		There was a paper out today on the white dwarf cooling sequence of the globular cluster NGC 6397 (the second closest globular to us, after M4).
		Indeed, other issues like the non-uniform distribution of metals in the cluster, or a spread in time when the stars in the cluster were born are probably more important than variability.
		I agree with you that we don't really have a direct indicator of age for most stars, and that it is inferred from the theory.
	uplink.space.com /showflat.php?Board=sciastro&Number=656623 (2990 words)

	APOD: 2003 August 8 - Blue Stragglers in NGC 6397
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		Pictured is the central region of NGC 6397, a globular cluster about 6,000 light-years distant, whose
		NGC 6397's massive stars have long since evolved off the
	antwrp.gsfc.nasa.gov /apod/ap030808.html (218 words)

	Hubble NGC 6397 Globular Cluster Photo
		This Hubble Space Telescope view of the core of one of the nearest globular star clusters, called NGC 6397, resembles a treasure chest of glittering jewels.
		The stars are only a few light-weeks apart, while the nearest star to our Sun is over four light-years away.
		The stars in NGC 6397 are in constant motion, like a swarm of angry bees.
	www.spaceimages.com /ngc63glcl.html (777 words)

	HubbleSite - NewsCenter - Too Close for Comfort (08/07/2003) - Introduction
		The stars in NGC 6397 are also in constant motion, like a swarm of angry bees.
		The heat generated by the accreting material also generates unusual amounts of ultraviolet and blue light.
		To search for cataclysmic variables, the Hubble program consisted of a series of 55 images of the cluster taken over a period of about 20 hours.
	hubblesite.org /newscenter/archive/releases/2003/21 (513 words)

	UC Santa Cruz Press Release: Astronomers find the most distant star clusters hidden behind a nearby cluster
		Kalirai and Harvey Richer of the University of British Columbia led the study, which began as an investigation of a globular star cluster in the Milky Way galaxy known as NGC 6397.
		The new data from stars within NGC 6397 have yielded important insights into the age, origin, and evolution of this cluster.
		In fact, a single giant star in NGC 6397 appears 10 million times brighter than one of the distant globular clusters.
	www.ucsc.edu /news_events/press_releases/text.asp?pid=1007 (695 words)

	Blue Stragglers in NGC 6397
		In fact, researchers have evidence that the closely spaced blue stars near the center of the above image taken by the orbiting
		Publications with keywords: NGC 6397 - blue stragglers - globular cluster
		Publications with words: NGC 6397 - blue stragglers - globular cluster
	www.astronet.ru:8100 /db/xware/msg/1192159 (216 words)

	Hubble Faintest Stars in NGC 6397 Photo
		Looking like glittering jewels, the stars in this Hubble Space Telescope image are part of the ancient globular star cluster NGC 6397.
		The images were taken with visual and red filters.
		NGC 6397, one of the closest globular clusters to Earth, is 8,500 light-years away in the southern constellation Ara.
	www.spaceimages.com /hufastinngc6.html (205 words)

	Catalogue: J/AJ/119/1225/table4
		J/AJ/119/1225 Stroemgren photometry of Omega Cen and NGC 6397 (Hughes+, 2000) ================================================================================ Age and metallicity effects in Omega Centauri: Stroemgren photometry at the main-sequence turnoff Hughes J. Wallerstein G.
		We have found a correlation of age and metallicity in a region that avoids the dense core and the inhomogeneous foreground dust emission shown by IRAS.
		This file × table2.dat 70 2473 Objects in {omega} Centauri × table3.dat 62 536 Objects in the off-cluster field × table4.dat 70 976 Objects in NGC 6397
	vizier.u-strasbg.fr /cgi-bin/Cat?J/AJ/119/1225/table4 (479 words)

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