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Topic: Ejnar Hertzsprung

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	The Sun: Man's Friend & Foe - Hertzsprung
		Ejnar Hertzsprung was born Oct 8, 1873 in Copenhagen, Denmark.
		Hertzsprung was the Danish astronomer who pioneered the study of the birth and death of stars.
		Ejnar Hertzsprung died October 21st, 1967 at the age of 94.
	library.thinkquest.org /15215/History/hertzsprung.html (562 words)

	Ejnar Hertzsprung Summary
		In 1905, Hertzsprung set up a standard that he called the "absolute magnitude" of a star, defining the quantity as what a star's brightness would be at a distance of ten parsecs from the earth (one parsec is equivalent to 3.26 light-years).
		Hertzsprung became assistant director of the Leiden Observatory in the Netherlands in 1919, and published a catalog of color measurements for almost 750 stars in 1922.
		Ejnar Hertzsprung (October 8, 1873, Copenhagen – October 21, 1967, Roskilde) was a Danish chemist and astronomer.
	www.bookrags.com /Ejnar_Hertzsprung (1533 words)

	Ejnar Hertzsprung Beschreibung in Library - Definition und Buch-Tipp.
		Eine Übersicht der Artikel, die mit dem Thema Ejnar Hertzsprung verwandt sind finden Sie auf der Seite alle Artikel über Ejnar Hertzsprung.
		Ejnar Hertzsprung (* 8.10 1873 in Frederiksborg; † 21.10 1967 in Tølløse) war ein dänischer Astronom.
		Hertzsprung hat durch seine Forschungsarbeit wichtige Beiträge zur Entwicklung der modernen Astrophysik geleistet.
	ejnar_hertzsprung.know-library.net (882 words)

	Hertzsprung, Ejnar (Site not responding. Last check: )
		Hertzsprung was born in Frederiksberg and studied chemical engineering at the Fredriksberg Polytechnic.
		In 1905, Hertzsprung proposed a standard of stellar magnitude for scientific measurement, and defined this 'absolute magnitude' as the brightness of a star at the distance of 10 parsecs (32.6 light years).
		In 1922, Hertzsprung published a catalogue on the mean colour equivalents of nearly 750 stars of magnitude greater than 5.5.
	www.cartage.org.lb /en/themes/biographies/MainBiographies/H/Hertzsprung/1.html (207 words)

	H-R diagram
		In stellar astronomy, the Hertzsprung-Russell diagram (H-R diagram) shows the relation between the absolute magnitude and the spectral types of stars.
		It was invented around 1910 by Ejnar Hertzsprung and Henry Norris Russell.
		One is the observer's form which plots the color of the star on one axis and the absolute magnitude on the other axis.
	www.ebroadcast.com.au /lookup/encyclopedia/he/Hertzsprung-Russell_diagram.html (402 words)

	ip-tracing.com www.ip-tracing.com Ejnar Hertzsprung
		Nach seinem 1898 abgeschlossenen Chemiestudium arbeitete Hertzsprung mehrere Jahre in Sankt Petersburg.
		1909 lernte Hertzsprung Karl Schwarzschild kennen, der ihm in Göttingen eine Professur vermittelte und dem er 1909 nach Potsdam folgte.
		Hertzsprung hat durch seine Forschungsarbeit wichtige Beiträge zur Entwicklung der modernen Astrophysik geleistet.
	www.ip-tracing.com /wiki-Ejnar_Hertzsprung.html (270 words)

	Hertzsprung-Russell diagram at AllExperts
		The diagram was created circa 1910 by Ejnar Hertzsprung and Henry Norris Russell, and represented a huge leap forward in understanding stellar evolution, or the 'lives of stars'.
		Another prominent feature is Hertzsprung gap located in the region between A5 and G0 spectral type and between +1 and -3 absolute magnitudes (i.e.
		Hertzsprung gap is a subset of instability strip.
	en.allexperts.com /e/h/he/hertzsprung-russell_diagram.htm (577 words)

	Hertzsprung
		Hertzsprung was born October 8, 1873 in Copenhagen, his father had studied astronomy but could not get a job in that field, so he became a director of an insurance company.
		The work of Hertzsprung and Russell was first published in graphical form in 1911: the Hertzsprung-Russell Diagram.
		Hertzsprung remained an active researcher until he was over 90 years old.
	www.rundetaarn.dk /engelsk/observatorium/hertz.html (506 words)

	Ejnar Hertzsprung
		Hertzsprung var søn af en faguddannet astronom, der ikke fik arbejde som sådan, men som blev forsikringsdirektør.
		Efter at have arbejdet som kemiingeniør i udlandet i nogle år, lærte han fotokemi og begyndte derefter sit astronomiske arbejde, som især drejede sig om astrofotografi og spektroskopiske analyser.
		Hertzsprung vendte tilbage til København i 1902 og uddannede sig privat til astronom ved Universitetets observatorium og ved det private Uraniaobservatorium.
	www.kb.dk /udstillinger/astroweb/Astronomer/Hertzsprung.html (266 words)

	AllRefer.com - Ejnar Hertzsprung (Astronomy, Biography) - Encyclopedia
		Although trained as a chemical engineer, Hertzsprung made his career in astronomy, specializing in exacting photographic observations of stars.
		Working independently, both Hertzsprung and the American astronomer H. Russell developed a graph in which the luminosity of a star is plotted against its surface temperature.
		Such a graph is now called a Hertzsprung-Russell diagram and is the fundamental piece of observational evidence that the theory of stellar evolution must explain.
	reference.allrefer.com /encyclopedia/H/HertzsprE.html (248 words)

	Hertzsprung Russell Diagram: Free Encyclopedia Articles at Questia.com Online Library (Site not responding. Last check: )
		U+005Bfor Ejnar Hertzsprung and H. RussellU+005D, graph showing the luminosity of a star as a function of its surface temperature.
		The luminosity, or absolute magnitude, increases upwards on the vertical axis; the temperature (or some temperature-dependent characteristic such as spectral class or color) decreases to the right on the horizontal axis.
		With Ejnar Hertzsprung he devised the Hertzsprung-Russell diagram.
	www.questia.com /library/encyclopedia/hertzsprung_russell_diagram.jsp (1147 words)

	The Bruce Medalists: Ejnar Hertzsprung
		Ejnar Hertzsprung studied chemical engineering in Copenhagen, worked as a chemist in St. Petersburg, and studied photochemistry in Leipzig before returning to Denmark in 1901 to become an independent astronomer.
		In 1909 he was invited to Göttingen to work with Karl Schwarzschild, whom he accompanied to the Potsdam Astrophysical Observatory later that year.
		Beckett, Elizabeth, Holly Bernitt, and Vishwa Chandra, Ejnar Hertzsprung
	www.phys-astro.sonoma.edu /BruceMedalists/Hertzsprung/index.html (262 words)

	The Hertzsprung-Russell (H-R) Diagram
		In 1911, Ejnar Hertzsprung, a Danish astronomer studying at the University of Leiden in the Netherlands, plotted the luminosities of stars against their colors.
		So, essentially, Hertzsprung graphed how much energy a star gave off as a function of the star's temperature.
		Spectral types are another measure of temperature, so essentially, Russell made the same diagram that Hertzsprung made.
	www.virtualobservatory.org /explorer/proj/advanced/hr (451 words)

	Reference.com/Encyclopedia/Ejnar Hertzsprung
		In the period 1911-1913 with Henry Norris Russell, he developed the Hertzsprung-Russell diagram.
		He used this relationship to estimate the distance to the Small Magellanic Cloud.
		From 1919 to 1946 Hertzsprung worked at Leiden Observatory in The Netherlands, from 1937 as director.
	www.reference.com /browse/wiki/Ejnar_Hertzsprung (212 words)

	SJSU Virtual Museum
		Since this was not the system used by Pickering, the director of the star classification project at Harvard, her system remained unused at the time.
		Maury's system of star classification was later adopted by Ejnar Hertzsprung and became the basis of the Hertzsprung-Russell diagram, which is the cornerstone of modern stellar astrophysics.
		In addition to her star classification system, Maury was among the first to discover a double star.
	www.sjsu.edu /depts/Museum/mau.html (153 words)

	Rosenberg Diagram
		Until quite recently, I though that the first published HR diagram was constructed by Ejnar Hertzsprung for the stars of the Pleiades.
		To determine the latter quantity, nowadays replaced by spectral type or color index, Hertzsprung attached a coarse diffraction grating before the objective so that an ordinary stellar image on the photographic plate was accompanied by a very short first-order spectrum on either side.
		However, this first Hertzsprung attempt to visualize the relation between luminosities and colors of stars suffered from a systematic error due to influence of the secondary spectrum of the objective.
	leo.astronomy.cz /an/an.html (1273 words)

	Lake County Astronomical Society NightTimes
		Hertzsprung and Russell had each chosen the Pleiades for study because as an open cluster, all the stars in the Pleiades are of the same distance, since they were all formed out of the same gas cloud a mere 4.2 million years ago.
		Hertzsprung and Russell felt that if the brightness of a star was a property of that star, then there may be some other properties of the starlight that would shed light on the nature of stars.
		Hertzsprung and Russell completed their color index measurements on the Pleiades and then plotted the magnitude of each star on the y-axis and it's color index on the x-axis.
	www.bpccs.com /lcas/Articles/hrdiag.htm (885 words)

	BNSC - Henry Norris Russell (1877-1957) and Ejnar Hertzsprung (1873-1967)
		BNSC - Henry Norris Russell (1877-1957) and Ejnar Hertzsprung (1873-1967)
		Henry Norris Russell (1877-1957) and Ejnar Hertzsprung (1873-1967)
		The Danish astronomer Ejnar Hertzsprung had made the same discovery in 1906, and a diagram mapping a star's brightness against its temperature, one of the most important tools available to the astrophysicist, is now called the Hertzsprung-Russell diagram.
	www.bnsc.gov.uk /lzcontent.aspx?nid=4729 (206 words)

	Kosmologika - Vetenskapsmännen - Ejnar Hertzsprung (Site not responding. Last check: )
		Ejnar Hertzsprung föddes i Danmark den 8 oktober år 1873.
		Ejnar belönades med 1937 års Brucemedalj vilket blev den blyge danskens största erkännande.
		Ejnar Hertzsprung dog den 21 oktober år 1967.
	www.kosmologika.net /Scientists/Hertzsprung.html (165 words)

	Classifying Stars (Site not responding. Last check: )
		Two astronomers, Ejnar Hertzsprung and Henry Russell, independently had the idea of plotting a graph of luminosity (or true brightness) against surface temperature for every star in the sky.
		The remarkable fact is that the points on the Hertzsprung - Russell diagram are not scattered randomly all over the graph; instead the points are grouped together in three district regions.
		The third group of dots in the lower left-hand corner of the Hertzsprung- Russell diagram represents stars that are both dim and hot.
	www.telescope.org /nuffield/pas/galaxy/galaxy7.html (353 words)

	[No title]
		Hertzsprung gave the name giant to the stars with this combination of features, and we have kept it ever since.
		Now, Hertzsprung and Russell noticed that the red stars came in two varieties: these very powerful, giant stars, in the upper right, and a set of rather feeble stars down in the lower right.
		At the time Hertzsprung and Russell created this diagram, they knew of very few stars which fell in its lower left corner: stars which were hot, yet feeble.
	spiff.rit.edu /classes/phys301/lectures/hr/hr.html (1428 words)

	Hertzsprung Ejnar - Search Results - ninemsn Encarta
		Hertzsprung Ejnar - Search Results - ninemsn Encarta
		Hertzsprung, Ejnar (1873-1967), Danish astrophysicist, who was a pioneer in the study of the birth and death of stars.
		Theories of stellar evolution are based primarily on clues obtained from studies of the stellar spectra related to luminosity.
	au.encarta.msn.com /Hertzsprung_Ejnar.html (83 words)

	Stellar Evolution and Death -- The Main Sequence (Site not responding. Last check: )
		In addition, we identify the location of the Sun, the twelve brightest stars visible from the Northern Hemisphere, and the white dwarf companions of Sirius and Procyon.
		The HR diagram is named after two astronomers, Ejnar Hertzsprung of Denmark and Henry Norris Russell of the US.
		Hertzsprung was the first to publish a plot of stellar brightness vs. surface temperature.
	observe.arc.nasa.gov /nasa/space/stellardeath/stellardeath_1ai.html (239 words)

	Ejnar Hertzsprung
		De Deense astronoom Ejnar Hertzsprung (1873-1967) begon zijn loopbaan als chemisch ingenieur.
		Hertzsprung was in de eerste plaats een waarnemer die door nieuwe en verbeterde methodes de uiterste nauwkeurigheid trachtte te bereiken.
		Hertzsprung was verder de eerste die de afstand van een object buiten ons Melkwegstelsel afleidde met behulp van cepheïden.
	www.sterrenkunde.nl /index/encyclopedie/hertzsprung.html (276 words)

	Hertzsprung, Ejnar - Who's Who in the Twentieth Century - HighBeam Research
		Hertzsprung, Ejnar (1873–1967) Danish astronomer, best known for his independent discovery of the Hertzsprung–Russell diagram.
		The son of a senior civil servant, Hertzsprung trained as a chemical engineer at the Copenhagen polytechnic, as his father believed that he would be unable to earn his living as an astronomer.
		Hertzsprung therefore worked as a chemist for some years before his first astronomical appointment at the Potsdam Observatory (1909).
	www.highbeam.com /doc/1O47-HertzsprungEjnar.html?refid=ency_botnm (142 words)

	hertzsprung and russell
		In my efforts to get a biographical account of Hertzsprung and Russell, I turned to the Bruce Medalist website which holds the complete list of all winners of this prestigious Astronomy award.
		Both Ejnar Hertzsprung and Henry Norris Russell were recipients of the award, but the biographies of each were different in their location as well as in their style.
		The first was found through a link from the Bruce Medalists website, which is an award given by the Astronomy Society of the Pacific, of which I am a member and therefore feel comfortable getting information from their website and using it solely for the purpose of your education.
	www.hopkins.k12.mn.us /pages/high/courses/online/astro/course_documents/the_sun/hr_diagram/two/hertz_russ/hertzsprung_russell.htm (679 words)

	Hertzsprung (Site not responding. Last check: )
		He sent a preprint to Schwarzchildt, the director of the Göttinger Observatory, and after they met in 1908 he proposed Hertzsprung as an extraordinary professor.
		During a travel to the USA in 1910 Schwarzchildt met Russell, who had come to the same results as Hertzsprung.
		Hertzsprung remained an active researcher until he was over 90 years old.
	home.worldonline.dk /durin/engelsk/observatorium/hertz.html (502 words)

	ESA - Space Science - Home - 8 October
		1873: On 8 October 1873, Ejnar Hertzsprung was born.
		Hertzsprung was a Danish astronomer who classified types of stars by relating their surface temperature (or colour) to their absolute brightness.
		A few years later Russell illustrated this relationship graphically in what is now known as the Hertzsprung-Russell diagram, which has become fundamental to the study of stellar evolution.
	www.esa.int /esaSC/SEM45VMKPZD_index_2.html (199 words)

	Ejnar Hertzsprung - Search Results - MSN Encarta
		Hertzsprung, Ejnar (1873-1967), Danish astrophysicist, who pioneered in the study of the birth and death of stars (Star).
		In about 1910 Danish astronomer Ejnar Hertzsprung and American astronomer Henry Norris Russell independently worked out a way to graph basic...
		evolution of stars, work of Ejnar Hertzsprung, work of Henry Norris Russell
	ca.encarta.msn.com /Ejnar_Hertzsprung.html (68 words)

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