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Topic: Double Cluster

In the News (Thu 31 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	SCYON: Paper abstracts (Site not responding. Last check: 2007-10-15)
		The h and Chi Per "double cluster" is examined using wide-field (0.98 deg x 0.98 deg) CCD UBV imaging supplemented by optical spectra of several hundred of the brightest stars.
		We discuss the uniqueness of the double cluster, citing other examples of such structures in the literature, but concluding that the nearly identical nature of the two cluster cores is unusual.
		We fail to settle the long-standing controversy regarding whether or not the double cluster is the core of the Per OB1 association, and argue that this may be unanswerable with current techniques.
	obswww.unige.ch /webda/scyon/Slesnick.html (277 words)

	Double Cluster (h and Chi Persei; NGC 869 and NGC 884)
		Double Cluster (h and Chi Persei; NGC 869 and NGC 884)
		Two young open clusters that lie close together in the sky in Perseus and are visible to the naked eye on a clear, dark night as a hazy patch of light.
		Both clusters lie in the Perseus OB1 Association and contain many B stars and M supergiants.
	www.daviddarling.info /encyclopedia/D/Double_Cluster.html (133 words)

	ESA - Science - Home - Double Star overview
		Double Star is a joint ESA/Chinese project to study the effects of the Sun on Earth's environment, and in particular the 'magnetotail', where storms of high-energy particles are generated.
		A key aspect of ESA's participation in the Double Star project is the inclusion of seven instruments that are identical to those currently flying on the four Cluster spacecraft.
		In September 1999, the ESA Director-General was invited by the Administrator of the China National Space Administration (CNSA) to discuss the collaboration on the Double Star programme.
	www.esa.int /export/esaSC/120381_index_0_m.html (693 words)

	SignOnSanDiego.com > News > Science -- Seeing double: Look for a beautiful cluster in northeast
		This is the celestial home of the famous double cluster of Perseus, one (or should I say two?) of the most beautiful showpieces in the sky.
		The double cluster is known officially to astronomers as "h and chi Persei," as well as NGC 869 and NGC 884.
		This is the celestial home of the double cluster of Perseus, one of the most beautiful "faint fuzzies" in the heavens.
	www.signonsandiego.com /news/science/20041013-9999-1c13star.html (408 words)

	Patent 4058546: Alkoxysilane double cluster compounds with silicone bridges and their preparation and use (Site not responding. Last check: 2007-10-15)
		These cluster compounds, however, are single cluster compounds in contrast to the double clusters of the present invention.
		In the method for preparing these alkoxysilanol cluster reactants, a trihalosilane or a silicon tetrahalide is reacted with a trialkoxysilanol in the presence of a hydrogen halide acceptor base, and optionally, a solvent, to obtain an intermediate compound which is subsequently reacted with water to produce the cluster compound reactant of Formula II.
		The double cluster compounds display these properties both in substantially pure form and in mixture with excess alkoxysilanol cluster reactant defined in Equation A. Accordingly, the invented compounds have been found to be particularly useful as functional fluids.
	www.freepatentsonline.com /4058546.html (4380 words)

	NGC 869, NGC 884 (Site not responding. Last check: 2007-10-15)
		The famous double cluster in Perseus was known in antique times (probably even pre-historically), and first cataloged by the Greek astronomer Hipparcos.
		Both clusters are situated in the Perseus OB 1 association, and also only a few hundred light-years appart, at a distance of over 7000 light years.
		The Double Cluster h and Chi Persei was featured in Jeff Bondono's Masterpieces Messier Missed for December, 1996
	www.seds.org /messier/xtra/ngc/n0869.html (283 words)

	SPACE.com -- Hubble Unveils Double Star Cluster in Nearby Galaxy
		NGC 185 is an unusual double star cluster lying in the Large Magellanic Cloud, a satellite galaxy of the Milky Way.
		The double cluster, named NGC 1850 and shown in the adjacent image, spans 96 light years.
		The estimated 10,000 blue and white stars in the large center cluster are 50 million years old and most have masses less than 10 solar masses.
	www.space.com /scienceastronomy/astronomy/hubble_cluster_010710.html (676 words)

	CNN.com - Hubble spies exotic double cluster - July 10, 2001
		The double cluster, known as NGC 1850, is a dense collection of juvenile, globular-like stars, and the second brightest star cluster in the Large Magellanic Cloud.
		The NGC 1850 cluster consists of a main clump in the center of the image as well as a smaller, younger bunch to the lower right, composed of exceptionally hot blue stars and fainter red ones, known as T-Tauri stars.
		The nebulous filaments that encompass NGC 1850 are thin wisps of gas, the eerie remnants of supernovae explosions that rocked the central cluster millions of years ago, according to astronomers.
	archives.cnn.com /2001/TECH/space/07/10/hubble.cluster (459 words)

	APOD: January 29, 1997 - NGC 869 & NGC 884: A Double Open Cluster (Site not responding. Last check: 2007-10-15)
		Also known as "h and chi Persei", this rare double cluster, shown above, is bright enough to be seen from a dark location without even binoculars.
		Although their discovery surely predates written history, the "double cluster" was notably cataloged by the Greek astronomer Hipparcos.
		The clusters are over 7000 light years distant toward the constellation of Perseus, but are separated by only hundreds of light years.
	antwrp.gsfc.nasa.gov /apod/ap970129.html (123 words)

	ESA Science & Technology: Report on Second Double Star - Cluster Workshop (Site not responding. Last check: 2007-10-15)
		Double Star is located around the ecliptic plane (red spot) and Cluster near the polar cusp (blue spot).
		Coordinated (simultaneous) measurements by Cluster in the solar wind (adjacent to the bow shock) indicate that the magnetic field in the magnetosheath at this time indeed had a northward component.
		A recent study using the Cluster data has shown that these ions are observed closer to the Earth and their quantity increases during geomagnetic storms (figure 4).
	hubble.esa.int /science-e/www/object/index.cfm?fobjectid=36109 (1192 words)

	NGC 869 and NGC 884 The Double Cluster
		While star clusters are neat in themselves, this pair of open clusters, NGC 869 and NGC 884, are doubly interesting.
		While double clusters are extremely rare, this one is particularly special because it can be seen in a dark location with the naked eye.
		The clusters are over 7000 light years away in the direction of the constellation Perseus, but are separated by only a few hundred light years.
	www.macalester.edu /astronomy/research/phys20/CM99/chrism.html (563 words)

	CHAPTER 8
		As in the star cluster, the resu It is an eyuilibrium between the inward motion of the outer particles and the outward motion of the inner particles.
		Furthermore, the H–R diagram of this cluster, which indicates its stellar composition, is almost identical with that of a late type globular cluster, such as M 13, whereas the stars of the open clusters that are now seen to be older, are mainly main sequence stars, comparable to the general population in their environment.
		As the clusters are pulled slowly in toward the Galaxy gravitationally, the atom–building processes that are under way in all matter inerease the proportion of heavy elements, while at the same time the differential gravitational effects reduce the cluster mass.
	www.reciprocalsystem.com /nfs/nfs08.htm (7597 words)

	HubbleSite - Hubble Snaps Picture of Remarkable Double Cluster - Image - 7/10/2001
		The double cluster NGC 1850, found in one of our neighboring galaxies, the Large Magellanic Cloud, is an eye-catching object.
		The two components of the cluster are both relatively young and consist of a main, globular-like cluster in the center and an even younger, smaller cluster, seen below and to the right, composed of extremely hot, blue stars and, fainter red T-Tauri stars.
		One of Hubble's main contributions to the study of NGC 1850 is in the investigation of star formation at both ends of the stellar mass scale — the low-mass T-Tauri stars and the high-mass OB stars.
	hubblesite.org /newscenter/newsdesk/archive/releases/2001/25/image/a (706 words)

	ESA Portal - Hubble images remarkable double cluster (Site not responding. Last check: 2007-10-15)
		The Double Cluster NGC 1850 found in one of our neighbouring galaxies, the Large Magellanic Cloud, is an eye catching object.
		The two components of the cluster are both relatively young and consist of a main globular-like cluster in the centre and an even younger, smaller cluster, seen below and to the right, composed of extremely hot, blue stars and fainter red T-Tauri stars.
		The main cluster is about 50 million years old and the smaller cluster is only 4 million years old.
	www.esa.int /esaCP/ESAA640VMOC_index_2.html (606 words)

	Double Cluster
		The two clusters glitter as a pair of matched celestial jewels, even more beautiful through a telescope than any image can capture.
		Despite their distance of 7,300 light years from Earth, they are clearly visible to the naked eye from suburban or rural areas, glowing as a faint patch of light midway beween the constellations Cassiopeia and Perseus.
		The Double Cluster was imaged with a ST-10XME camera on a 4" refractor, using an LRGB composite of 57-L, 14-R, 14-G, and 20-B one-minute exposures.
	www.stardoctor.org /Double.html (143 words)

	The Perseus Double Cluster of Stars (Site not responding. Last check: 2007-10-15)
		The Perseus double cluster is a rich pair of open star clusters that are a spectacular sight even in binoculars.
		The cluster on the left in the above photo is NGC 869, a magnitude 5.3 open cluster of about 200 stars about 29 arcminutes in diameter.
		The cluster on the right in the above photo is NGC 884, a magnitude 6.1 open cluster of about 115 stars, having a size of about 29 arcminutes in diameter.
	members.cox.net /sidleach/ngc869.htm (150 words)

	SCYON: Paper abstracts (Site not responding. Last check: 2007-10-15)
		We present uvby ß CCD photometry of the central region of the double cluster h and chi Persei.
		These values are perfectly compatible with both clusters being placed at the same distance and having identical reddenings.
		The shift in the main-sequence turnoff and isochrone fitting, however, show that there is a significant age difference between both clusters, with the bulk of stars in h Persei being older than chi Persei.
	obswww.unige.ch /webda/scyon/Marco.html (207 words)

	Double Cluster in Perseus (Site not responding. Last check: 2007-10-15)
		The double cluster is a very nice object in binoculars.
		The left most cluster in NGC 884 and the right most cluster in NGC 869.
		At a diameter of 29 arcmin, each cluster is about the same size as the full moon.
	rao.150m.com /Double.html (129 words)

	NGC 869 & 884 The Double Cluster
		The famous Double Cluster, NGC 869 and NGC 884, is located in the constellation Perseus and has been know since ancient times.
		The two clusters lie at a distance of 7,100 and 7,400 light years respectively from earth.
		The clusters are very young and are estimated to have formed in the last few million years.
	www.waid-observatory.com /ngc869-2004-11-20.html (88 words)

	h and Chi Per -- The Double Cluster
		Burnham's describes the Double Cluster thusly, "Among the all-time favorites for amateur observers, it may be seen without optical aid as a hazy patch of light about midway between the stars of Perseus and the familiar "W" of Cassiopeia.
		It appears that the clusters are relatively close to one another in space; their relative distances differ by only about 7%.
		Another thing to consider while gazing at their beauty is that the stars that make up these clusters are pretty young as stars go; they were formed out of giant molecular cloud complexes in a wink of an eye ago (on cosmic timescales).
	www.skyhound.com /sh/archive/nov/NGC_869.html (337 words)

	The Double Cluster in Perseus, NGC 869 and NGC 884, in BinoSky, a guide to astronomy with binoculars. (Site not responding. Last check: 2007-10-15)
		The Double Cluster in Perseus, NGC 869 and NGC 884, in BinoSky, a guide to astronomy with binoculars.
		The Double Cluster in Perseus, NGC869 and 884
		Double the viewing pleasure in one field of view.
	www.lightandmatter.com /binosky/dc.html (75 words)

	CATHOLIC ENCYCLOPEDIA: Astronomy
		The latter class exemplified by the Pleiades and Hyades, by the Beehive cluster in Cancer, just visible to the naked eye, and by the double cluster in Perseus which makes a splendid show with an opera-glass.
		Globular clusters are compressed "balls" of minute stars, of which more than one hundred have been catalogued.
		Hundreds of rapid variables have been recently detected among the components of glabular clusters; but their course of change is of a totally different nature from that of eclipsing stars.
	www.newadvent.org /cathen/02025a.htm (4523 words)

	Double Cluster
		he Double Cluster is easily visible to the unaided eye in Perseus from a dark sky observing site.
		When viewed in a telescope, the spectacular beauty of these two open clusters is revealed.
		Each cluster contains more than 100 stars, the brightest in NGC 884 being 8th magnitude, and the brightest in NGC 869 being about 6.6 magnitude.
	www.astropix.com /HTML/A_FALL/DC.HTM (136 words)

	The Pleiades, the Hyades, and the Double Cluster
		Aldebaran is not actually part of this cluster; it's only half the distance away from us as the Hyades.
		The Double Cluster, NGC 869 and NGC 884 is a must see.
		Any cluster that has supergiants is therefore a young cluster.
	www.suite101.com /article.cfm/15537/83447 (458 words)

	Double Cluster and Double Nebulae
		I call IC 1805 and LBN 667 the "Double Nebulae" because of their close proximity to the Double Cluster (NGC 884 and NGC 869) about five degrees away.
		Although extremely large, the double nebulae are very faint.
		The Double Cluster however is a showpiece object that can even be seen with the unaided eye.
	www.astropix.com /HTML/A_FALL/DC_DN.HTM (136 words)

	Double Cluster
		The Double Cluster has the distinction of being the "object that Messier missed." Wny the author of the Messier Catalog, a group of the skies 109 brighter objects, would have left out the combination of NGC 869 and NGC 884 is a mystery.
		Next to the Pleiades, the Double Cluster is perhaps the most beautiful and brightest open star clusters in the night sky.
		Using binoculars in even the worse light pollution, the pair of clusters is obvious.
	www.allaboutastro.com /Doublecluster.html (220 words)

	Jane Houston Jones; The Sonoma Double Cluster (Site not responding. Last check: 2007-10-15)
		There were two clusters of 8 scopes each at Lone Rock Flat, Lake Sonoma, CA last night, 4/6/02.
		The other cluster set up in the headlight-hollow near the road, a nice low point protected from car lights.
		Soon fl hilltop and tree silhouettes masked the h-alpha disk, and the cluster of observers separated and returned to set up their telescopes.
	observers.org /reports/2002.04.06.2.html (640 words)

	HubbleSite - Hubble Snaps Picture of Remarkable Double Cluster - 7/10/2001
		These two dazzling clusters of stars, called NGC 1850, are found in one of our neighboring galaxies, the Large Magellanic Cloud.
		The smaller second cluster is below and to the right of the main cluster.
		The stars are surrounded by a filigree pattern of diffuse gas [left], which scientists believe was created by the explosion of massive stars.
	hubblesite.org /newscenter/newsdesk/archive/releases/2001/25 (138 words)

	Ralph Aguirre; Double Cluster and Machholz side by side tonight (Site not responding. Last check: 2007-10-15)
		I had a chance to peek at both Comet Machholz and the Double cluster in Perseus, NGC884/NGC869 side by side tonight.
		In 10x42 binoculars, it was tough to make out the double cluster because it was so tiny at 10x but the glow of Machholz was still very apparant.
		Using my grab and go TV-85, I was able to see the see both the Double Cluster and Machholz both side by side in the same field of view.
	observers.org /reports/2005.01.28.html (229 words)

	Astro Images Space Art - A Remarkable Double Cluster NGC 1850 (Site not responding. Last check: 2007-10-15)
		This space art picture from Astro Images' Star Cluster Gallery of these two dazzling clusters of stars called NGC 1850 which is found in our neighboring galaxy, the Large Megallanic Cloud.
		The larger of the two is a young, globular-like star cluster, unknown in our own Mildy Way Galaxy.
		The stars are surrounded by a filigree pattern of diffuse gas, which scientists believe was created by the explosion of massive stars.
	www.astroimages.net /Media/Clusters/SC04.html (94 words)

	The Double Cluster (Site not responding. Last check: 2007-10-15)
		Located about half way between gamma PER and delta CAS, the Double Cluster is easily spotted in binoculars.
		If you are using an equatorial mount on your telescope, find alpha CAS and then move to the east.
		When you reach the the Double Cluster, you will be about a half degree below it.
	physics.ccri.edu /keefe/double_cluster.htm (97 words)

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