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Topic: Bart Bok


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  Bart Bok - Wikipedia, the free encyclopedia
Bart Jan Bok (Hoorn, April 28, 1906 Tucson, August 5, 1983) was a Dutch-American astronomer.
Bart Bok was an exceedingly popular personality in the field of astronomy, noted for his affability and humor, as well as his capacity for drinks.
Bok crater on Mars is named for a geographical location in Papua New Guinea and not for him.
en.wikipedia.org /wiki/Bart_Bok   (283 words)

  
 Bok, Bartholomeus ("Bart") Jan (1906-1983)
The latter part of his career was spent at the University of Arizona, where he directed the Steward Observatory from 1966 to 1970.
Working closely with his wife, Priscilla Fairfield Bok, he studied the structure and evolution of star clusters and the Galaxy, mapping the spiral arms of the Milky Way, especially in the Carina region, and the Magellanic Clouds.
Bok initiated radio astronomy at Harvard and promoted it elsewhere.
www.daviddarling.info /encyclopedia/B/Bok.html   (266 words)

  
 Bart Bok - the free encyclopedia   (Site not responding. Last check: 2007-09-11)
Bart Jan Bok (Hoorn, April 28,1906 – Tucson, August 5, 1983) was a Dutch-American astronomer.
The Bok crater on the Moon is named after him, as is the asteroid 1983 Bok.
There is a Bok crater on Mars as well, but itis named for a geographical location in Papua New Guinea and notfor him.
www.encyclopedia-of-world-knowledge.com /default.asp?t=Bart_Bok   (132 words)

  
 tScholars.com | Bok globule
A Bok globule is a dark cloud of dense dust and gas in which star formation is sometimes taking place.
Bok globules are found within H II regions, and typically have a mass of about 10–50 solar masses contained within a region about a light year or so across
Bok globules were first observed by astronomer Bart Bok in the 1940s.
www.tscholars.com /encyclopedia/Bok_globule   (470 words)

  
 Bok globule - the free encyclopedia   (Site not responding. Last check: 2007-09-11)
A Bok globule is a dark cloud of dense dust and gas in which starformation is taking place.
Bok globules are found within H II regions,and typically have a mass of about 10–50 solar masses contained within a region about a light year orso across
In a paper published in 1947, Bok and E.F. Reilly hypothesised that these clouds were'cocoons' that were undergoing gravitational collapse to form new stars from which stars andstar clusters were born
www.encyclopedia-of-world-knowledge.com /default.asp?t=Bok_globule   (358 words)

  
 Online Encyclopedia and Dictionary - Bart Bok
Bart Jan Bok (Hoorn, April 28 1906 – Tucson, August 5 1983) was a Dutch-American astronomer.
He won the Bruce Medal in 1977, and was awarded the Henry Norris Russell Lectureship in 1982, and the Klumpke-Roberts Award in that same year.
There is a Bok crater on Mars as well, but it is named for a geographical location in Papua New Guinea and not for him.
www.fact-archive.com /encyclopedia/Bart_Bok   (163 words)

  
 * Bok Globule - (Astronomy): Definition
In 1947, Bart Bok suggested that the small dark globules of interstellar gas and dust were undergoing collapse on their way to forming new stars.
Bok globules have characteristic radii of 103-105 AU.
The clouds, which are known as Bok globules after the astronomer who first described them, are so thick that they absorb the light from stars or gas clouds behind them.
en.mimi.hu /astronomy/bok_globule.html   (294 words)

  
 April 28 - Today in Science History   (Site not responding. Last check: 2007-09-11)
Bart Jan Bok was a Dutch-American astronomer whose name remains associated with the "Bok globules" he was the first to investigate - dark clouds of dense gas and dust visible against a background of bright nebulae.
Bok globules have a mass of 10 to 50 times the mass of the Sun and are about a light year across.
Bok bicycled to Norway to observe the solar eclipse of 1927.
www.todayinsci.com /4/4_28.htm   (1866 words)

  
 Bok, Bart (Jan)   (Site not responding. Last check: 2007-09-11)
Bok, born in Hoorn, was educated at Leiden and Groningen in the Netherlands and in the USA at Harvard, where he remained and became professor 1947.
Bok also discovered small, circular dark spots, which were best observed against a bright background.
Bok suggested that the globules were clouds of gas in the process of condensation and that stars might be in the early stages of formation there.
www.cartage.org.lb /en/themes/Biographies/MainBiographies/B/Bok/1.html   (163 words)

  
 The Stuff Stars are Made of :: Astrobiology Magazine ::
Summary (Jun 26, 2005): Named after Harvard University astronomer Bart Bok, Bok globules may not be the most romantic sounding phrase in astronomy, but they are widely accepted as an important step in the formation of new stars.
Bok suggested that certain isolated and distinct globules obscuring background light in space were in fact evidence of an important preliminary stage in the formation of protostellar disks leading to the birth of stars such as our sun.
Once candidate Bok globules were selected, the team subjected each of them to a battery of observations designed to determine their mass, density, temperature, size, and if possible, the amount of pressure applied on them by the ISM and neighboring starlight.
www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=1617&mode=thread&order=0&thold=0   (1158 words)

  
 The Bok Prize
The prize is named to commemorate the energetic work of Bart Jan Bok in promoting the undergraduate and graduate study of astronomy in this country, during his term as Director of the Mount Stromlo Observatory.
Each entry must also be accompanied by a statement from the candidate's lecturer or supervisor indicating the relationship of the submission to the student's course requirements, and a confidential statement on the originality of the submission.
The decision of the assessment panel for the Bok Prize in Astronomy is final (including any decision that no entry is of sufficient merit for the Prize to be awarded in a particular year).
asa.astronomy.org.au /bok.html   (526 words)

  
 Bart Bok
Bart Jan Bok (April 28 1906 – August 5 1983) was a Dutch-American astronomer.
He was born in the Netherlands, but worked at Harvard University from 1929–1957.
A crater on the Moon is named after him, as is the asteroid 1983 Bok.
www.xasa.com /wiki/en/wikipedia/b/ba/bart_bok.html   (115 words)

  
 SFL ORG. News Center Nearby Dust Clouds in the Milky Way
These opaque, dark knots of gas and dust are called "Bok globules," and they are absorbing light in the center of the nearby emission nebula and star-forming region, NGC 281.
Bok hypothesized that giant molecular clouds, on the order of hundreds of light-years in size, can become perturbed and form small pockets where the dust and gas are highly concentrated.
The Bok globules in NGC 281 are located very close to the center of the IC 1590 cluster.
www.sflorg.com /spacenews/sn040406_01.html   (680 words)

  
 Amazon.ca: The Man Who Sold the Milky Way: A Biography of Bart BOK: Books: David H. Levy   (Site not responding. Last check: 2007-09-11)
Bok, who became a U.S. citizen in 1938, was the driving force in creating observational definitions of the Milky Way and other phenomena of galaxies.
Bok was one of a number of Dutch-born astronomers who have had distinguished research careers in the United States.
Tucson-based writer and amateur astronomer Levy is candid about Bok's life, work, and disputes; however, his writing is occasionally awkward, and the work lacks any overall analysis of Bok's accomplishments.
www.amazon.ca /Man-Who-Sold-Milky-Way/dp/0816511497   (403 words)

  
 Bart J. Bok
Er ist bekannt für seine Arbeiten über die Struktur und Evolution der Milchstraße sowie dem Studium der Globulen.
Bok studierte an den Universitäten Leiden und Groningen (Ph.
Bart J. Bok, Priscilla F. Bok: The Milky Way (1941, 5.
www.all2know.com /de/wikipedia/b/ba/bart_j__bok.html   (119 words)

  
 physics4u - Αστέρια υπό κατασκευήν σε σφαιρίδια Bok
Το 1947, ο αστρονόμος του Χάρβαρντ Bart Jan Bok ανήγγειλε το αποτέλεσμα μια μελέτης πολλών ετών για περιοχές ψυχρών αερίων και σκόνης που συχνά συνδέονταν με εκτεταμένα νεφελώματα.
Ο Bok πρότεινε ότι ορισμένα απομονωμένα και ευδιάκριτα σφαιρίδια, που κρύβουν το φως του υποβάθρου, ήταν στην πραγματικότητα στοιχεία ενός σημαντικού προκαταρκτικού σταδίου στο σχηματισμό των πρωτοαστρικών δίσκων, τα οποία οδηγούν στη γέννηση των άστρων όπως ο ήλιός μας.
Μετά από την ανακοίνωση του Bok, αναπτύχθηκαν πολλά μοντέλα για να εξηγήσουν πώς από τα σφαιρίδια Bok θα μπορούσαν να σχηματιστούν τα αστέρια.
www.physics4u.gr /news/2005/scnews2014.html   (543 words)

  
 BBC - h2g2 - Four Types of Bok
This is a small, dark cloud of stellar gas and dust which is in the process of condensing into one or more stars.
Bok's work was dedicated to understanding and promoting the structure of the Milky Way.
Simmer until the bok choy is tender, but still on the crisp side.
www.bbc.co.uk /dna/h2g2/A436321   (444 words)

  
 physics - Bok globule
A Bok globule is a dark cloud of dense dust and gas in which star formation is taking place.
In a paper published in 1947, Bok and E.F. Reilly hypothesised that these clouds were 'cocoons' that were undergoing gravitational collapse to form new stars from which stars and star clusters were born
An analysis of infrared observations published in 1990 confirmed that stars were being born inside Bok globules
www.physicsdaily.com /physics/Bok_globule   (368 words)

  
 Steward Observatory Bok Telescope Home   (Site not responding. Last check: 2007-09-11)
The 90" (2.3 m) Bok Telescope on Kitt Peak is the largest telescope operated solely by Steward Observatory.
The Bok Telescope is available for use by astronomers from the University of Arizona, Arizona State University, and Northern Arizona University.
The Bok Telescope offers a choice of two Cassegrain focal stations: an f/9 Ritchey-Chretien focus for visible-wavelength observations and an f/45 focus for infrared observations.
james.as.arizona.edu /~psmith/90inch/90inch.html   (178 words)

  
 bok
vücuttan atýldýðýnda, kesif bir koku ile birlikte rahatlama hissi veren bok; binlerce yýldýr ki insanoðlu eminiz varolduðundan beri sýçýyor, toplumlarýn ilgi odaðý olmakla birlikte(?) ekosistem açýsýndan da kayda deðer verilerle karþýmýza çýkmaktadýr.
ortaya çýkan rakam korkutucudur; erkekler günde 1272 ton bok üretirken ki bu rakam bütünün %63'ünü oluþturmaktadýr, 740 ton boku da kusura bakmasýnlar ama bayanlar üretmektedir.(valla rakamlarý minimize ettim ama sizin de maþallahýnýz var!!!)
- geri dönüþüm, bok böceðinin katkýlarý haricinde mümkün müdür?
84.44.114.44 /show.asp?t=bok&kw=&a=&v=&p=5   (285 words)

  
 NGC281text
Several compact globules known as Bok globules are projected against the background of the emission nebula.
These compact dark structures were first described by the astronomer Bart Bok (1906-1983) in the 1940's.
Bok Globules are small dark clouds of gas and dust that are found in HII regions and typically have a mass of about 10 to 50 solar masses.
www.robgendlerastropics.com /NGC281text.html   (636 words)

  
 bok ☼ Wyszukane strony Internetowe   (Site not responding. Last check: 2007-09-11)
The Bok Center's mission is to improve undergraduate education at Harvard.
The Bok Telescope is available for use by astronomers from the University...
Bok globules, named after astronomer Bart Bok who studied them...
bok.klip.pl   (179 words)

  
 University Of Arizona Astronomy
Applications are solicited for the Bart J. Bok Fellowship in Astronomy and Astrophysics at Steward Observatory, University of Arizona.
The full facilities of the Observatory are available to the Fellow, who is encouraged to pursue both independent research and collaborative work with Observatory staff members.
The link for previous Bok Fellows is at the top of this ad that you're now reading, and the link for "How to fill out the UA Human Resources form" is just below.
www.as.arizona.edu:8080 /Astro/bok_ad.html   (297 words)

  
 The Bruce Medalists: Bart Bok
Bart Bok was born in the Netherlands and educated at the Universities of Leiden and Groningen, earning his doctorate at the latter under P.J. van Rhijn.
Levy, David H., The Man Who Sold the Milky Way: A Biography of Bart Bok (University of Arizona Press, Tucson, 1993).
Whiteoak, J.B., “Student Memories of Bart Bok, an Astronomical Godfather,” Proc.
phys-astro.sonoma.edu /BruceMedalists/Bok/index.html   (396 words)

  
 Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy
I took the remaining seat and Bart promptly announced that the purpose of the meeting was to discuss the initiation of a "Radio Project" in the Astronomy Department.
Bart and Doc will be Co-Directors, with Doc responsible for the radio part and Bart for the astronomy part of radio astronomy.
He suggested we discuss it; however, he was quick to point out that the Astronomy Department would not develop an in house capability in electronics, which would require electrical engineers, technicians, electronic test equipment and all that goes with an in house radio capability.
www.nrao.edu /archives/Ewen/ewen_harvard24and60.shtml   (2639 words)

  
 Bok globule   (Site not responding. Last check: 2007-09-11)
An image of Bok globules in the [[H II region IC 2944, taken with the WFPC2 instrument on the Hubble Space Telescope]] A Bok globule is a dark cloud of dense dust and gas in which star formation is taking place.
Clemens D.P., Yun, J.L., Heyer M.H. Bok globules and small molecular clouds – Deep IRAS photometry and (C-12)O spectroscopy, Astrophysical Journal Supplement, v.75, p.877 Launhardt R., Sargent A.I., Henning T., et al.
Eds Reipurth and Zinnecker, p.103 Bok, B. J., Reilly, E. Small Dark Nebulae, Astrophysical Journal, v.105, p.255 Yun J.L., Clemens D.P. Star formation in small globules – Bart Bok was correct, Astrophysical Journal, v.365, p.L73 Reipurth, B., Heathcote, S., and Vrba, F. Star formation in Bok globules and low-mass clouds.
bok-globule.iqnaut.net   (347 words)

  
 * Globule - (Astronomy): Definition
A globule is an interstellar cloud of dust and hydrogen gas that contracts and undergoes gravitational collapse to form a star.
Small, dark clouds only about 1 light year in diameter that contain 10-1000 solar masses of gas and dust.
They tend to lie in regions of much dust but less gas than would be expected for star-forming regions.
en.mimi.hu /astronomy/globule.html   (496 words)

  
 American Scientist Online - Bart Bok's Black Blobs   (Site not responding. Last check: 2007-09-11)
Whereas the process of star formation in a giant molecular cloud is hidden in the confusion of complex turbulence and strong magnetic fields, the action inside a Bok globule is believed to be much simpler.
About 99 percent of the Bok globule consists of hydrogen and helium, both of which are fairly sedate in the chilly (16 degrees above absolute zero) environs of Barnard 68, and so offer few clues about the cloud.
Using the Very Large Telescope and the New Technology Telescope, both in the Chilean Andes, Alves and his colleagues were able to measure the degree to which the dust extinguished light coming from stars behind the cloud.
www.americanscientist.org /template/AssetDetail/assetid/14678   (596 words)

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