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Topic: HR diagram

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	HR Diagram - Interactive
		The HR diagram has stars on it at every phase in the life cycle.
		Think of the HR diagram as a representation of stars throughout their lives.
		This "family portrait" is an HR diagram with five stars on it and a background of the color each star would look through the filter of a spectrophotometer.
	outreach.physics.utah.edu /labs/star_life/hr_interactive.html (330 words)

	HR Diagram - Interactive
		The HR diagram has stars on it at every phase in the life cycle.
		Think of the HR diagram as a representation of stars throughout their lives.
		This "family portrait" is an HR diagram with five stars on it and a background of the color each star would look through the filter of a spectrophotometer.
	sunshine.chpc.utah.edu /labs/star_life/hr_interactive.html (330 words)

	HR Diagram for a Globular Cluster
		Rather than a random distribution of points, the HR diagram shows a number of regions which are preferentially populated by stars.
		The important feature of the HR diagram for the purpose of this exercise is that certain phases of stellar evolution are associated with well-defined luminosities of stars during these phases.
		If such a feature can be identified on the HR diagram for a group of stars then it can be used to estimate the distance to the stars from their apparent luminosities.
	www.phys.unsw.edu.au /astro/wwwlabs/gcCm/gcCm_intro.html (1624 words)

	PHYS134: Astro Fundamentals: Stellar Evolution
		The HR diagram is plotted with intrinsic brightness (luminosity or absolute magnitude) on the vertical axis (ordinate), increasing upwards, and effective temperature (colour or spectral type) on the horizontal axis (abcissa), increasing to the left.
		HR Diagrams can be used to illustrate many of the stages in the life of a star - Stellar Evolution.
		The problem with HR diagrams is that for them to make sense we need to know the absolute magnitudes or intrinsic luminosities of the stars.
	www.astro.livjm.ac.uk /courses/phys134/hrdiag.html (3318 words)

	HR Diagram and Stellar Evolution
		This plot is called a Hertzsprung-Russell (or HR) diagram, after the two astronomers who developed the concept in the late 1800's, Henry Norris Russell and Ejnar Hertzsprung.
		The HR diagram is important because it is the graphical interface between observation and theory in stellar evolution.
		The HR Diagram - And stellar evolution, from the Univ of Massachusetts Amherst
	www.tim-thompson.com /hr.html (2699 words)

	HR Diagram Activities
		Show the evolutionary sequence of 1, 5 and 10 solar-mass stars on an HR diagram and be able to account for the different stages.
		HR Diagram is an exercise that you can print out.
		HR Diagram Simulator allows you to place 1, 10 or 100 stars on the main sequence then compare their evolution off the main sequence either in steps or as a movie.
	outreach.atnf.csiro.au /education/senior/astrophysics/stellarevolution_hractivity.html (476 words)

	HR Diagram
		These diagrams, called the Hertzsprung-Russell or HR diagrams, plot luminosity in solar units on the Y axis and stellar temperature on the X axis, as shown below.
		The HR diagram becomes a calculating tool when one realizes that temperature, luminosity and size (radius) are all related by Stefan-Boltzmann's law.
		This means that on a HR diagram, a star's size is easy to read off once its luminosity and color are known.
	zebu.uoregon.edu /~js/ast122/lectures/lec11.html (1091 words)

	The Optical Color-Magnitude Diagram
		)diagram for all stars projected in the inner 2.5 pc of the ONC with optical photometry, along with the reddening vector corresponding to 5 magnitudes of visual extinction for comparison.
		We wish to test these statements by individually dereddening the stars according to their spectral types and constructing a proper HR diagram for the entire range of stellar masses and ages.
		Fractional completeness in Column (2) is calculated simply from the ratio of the number of stars on the HR diagram with a given apparent magnitude/color, to the number of stars in the total photometric sample with that apparent magnitude/color.
	donald.phast.umass.edu /preprints/starform/orion/node10.html (1161 words)

	Hertzsprung-Russell Diagram
		On HR diagrams of diverse stars, the majority of plots are found to cluster in a narrow band bordered on its lower edge by the dark, downward-sloping line, known as the zero age main sequence (ZAMS).
		This is the position on the HR diagram assumed by young stars once they derive most of their energy from thermonuclear reactions, rather than from the release of gravitational energy as the new stars contract from their protostellar gas clouds (Zeilik 1991).
		A characteristic feature of the HR diagrams of clusters is the turn-off from the main sequence of stars which have evolved away from the main sequence.
	www.peripatus.gen.nz /Astronomy/HerRusDia.html (2389 words)

	A162, Lecture 5
		The HR diagrams of typical open clusters (loose, 10's or 100's of stars) have blue stars on the main sequence and relatively few red giants.
		The Hertzsprung-Russell (HR) diagram is a plot of stellar luminosity against an indicator of stellar surface temperature (color or spectral type).
		From the HR diagram of nearby stars, we learn of the existence of a main sequence, red giants, and white dwarfs.
	www-astronomy.mps.ohio-state.edu /~dhw/Intro/lec5.html (787 words)

	vik dhillon: phy213 - the observed properties of stars - the Hertzsprung-Russell diagram
		A schematic HR diagram for stars in the solar neighbourhood is shown in figure 2.
		Most of the stars lie in four groups and there are large regions of the HR diagram which contain no stars.
		The narrow band which contains around 90% of the stars and runs diagonally across the HR diagram from hot, bright stars to faint, cool ones is known as the main sequence.
	www.shef.ac.uk /physics/people/vdhillon/teaching/phy213/phy213_hr.html (236 words)

	The Hertzsprung-Russell Diagram
		As you may have learned in class, the Hertzsprung-Russell Diagram, or the ``HR diagram'', is one of the most important tools used by astronomers: it helps us determine both the ages of star clusters and their distances.
		Thus, the HR diagram for a cluster of stars is useful for determining its age.
		While the HR diagrams presented in your class lectures or textbook allow us to provide a very nice description of the evolution of stars and star clusters, astronomers do not actually directly measure either the temperatures or luminosities of stars.
	ganymede.nmsu.edu /astro/a110labs/labmanual/node13.html (3239 words)

	hr diagram (Site not responding. Last check: )
		The HR diagram is basically a graph of a set of stars, plotting their luminosity (or their absolute magnitude, or their mass), against their temperature (or spectral type or colour).
		Below is the Hertzsprung-Russell (HR) Diagram for stars near the sun: It is readily apparent that the H-R Diagram is not uniformly populated, but that stars preferentially fall into certain regions...
		Hertzsprung-Russell Diagram The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and...
	www.bettahrsoftware.com /hrdiagram (911 words)

	Planetarium- Nehru Centre
		In the previous issue, we had described the HR diagram and the positions the stars of known distances in the solar neighborhood occupy in it.
		She plots the apparent brightnesses and colours of these stars in the same manner the HR diagram is done.
		In all probability the diagonal main sequence of this cluster would be shifted somewhere toward the bottom in the chart with respect to the main sequence of the HR diagram.
	www.nehrucentremumbai.com /newsletter/July04/planetarium1.htm (825 words)

	HR Diagram
		The classical HR diagram, first constructed in 1914 by Henry Norris Russell (to which was added the work of Ejnar Hertzsprung), is a plot of absolute visual magnitude against spectral class.
		Variations on the HR Diagram theme include plots of true luminosity in watts vs. temperature, and various kinds of magnitudes plotted against color.
		Their surroundings may become visible if they accrete mass from a binary companion, but they still cannot be placed on an HR diagram.
	www.astro.uiuc.edu /~kaler/sow/hrd.html (1592 words)

	Hertzsprung-Russell Diagram
		On this diagram, the higher (hotter) temperatures are on the left, and the lower (cooler) temperatures are on the right.
		Some HR diagrams include the color of stars as they can be seen through filters on spectrophotometers.
		The Sun rests approximately in the middle of the diagram, and it is the star which we use for comparison.
	outreach.physics.utah.edu /labs/star_life/hr_diagram.html (691 words)

	The Hertzsprung-Russell Diagram
		The Hertzsprung-Russell Diagram, pioneered independently by Elnar Hertzsprung and Henry Norris Russell, plots Luminosity as a function of Temperature for stars.
		It is readily apparent that the H-R Diagram is not uniformly populated, but that stars preferentially fall into certain regions of the diagram.
		As stars live out their lives, changes in the structure of the star are reflected in changes in stars temperatures, sizes and luminosities, which cause them to move in tracks on the H-R Diagram.
	cassfos02.ucsd.edu /public/tutorial/HR.html (242 words)

	Hertzsprung-Russell Diagram - Slackerpedia Galactica
		The Hertzsprung-Russell Diagram (commonly referred to the "HR Diagram"), pioneered independently by Elnar Hertzsprung and Henry Norris Russell, plots luminosity (or absolute magnitude or apparent magnitude) as a function of temperature (or color or spectral type) for stars.
		It is a diagram that anyone who takes Astronomy 101 has come to love, fear or both.
		The original H-R Diagram plotted the absolute magnitude of stars (which is directly related to their optical luminosity) versus their spectral type (which to great degree reflects their temperatures).
	www.slackerastronomy.org /slackerpedia/index.php/Hertzsprung-Russell_Diagram (234 words)

	Hr diagram, hr - HR Diagram and Stellar Evolution
		The Hertzsprung-Russell Diagram is a plot of luminosity vs temperature, except that the temperature is decreasing to the right on the horizontal axis.
		You can use the HR Diagram you constructed to find the distances to Use the spectral types and the HR diagram to estimate their absolute magnitudes.
		The Hertzsprung-Russell diagram is dominated by the main sequence, which forms a The HR diagram can be seen as both a snapshot of the state of a large
	hr.coolindexes.com /?q=hr-hr-diagram (458 words)

	HR Diagram of the Pleiades using CLEA
		You will use a telescope and spectrophotometer simulation to measure the brightness and color of a number of stars in the Pleiades cluster.
		From this data, you will create an HR diagram, and use this diagram to determine the distance to the cluster.
		You do not need to measure the U magnitude for all the stars, however after you've made your HR diagram, find a star that is close to the A0 spectral type, and see if U-B=B-V=0, approximately.
	www.rpi.edu /dept/phys/Courses/ASTR2050/indexPleiades.html (306 words)

	Stellar evolution in the electric universe
		The HR diagram is a static scatter plot, not a sequence.
		The HR diagram for the stars in the h and chi Persei double cluster has a markedly different shape from both that of M5 and the one for the stars in our neighborhood.
		The different shapes of the HR diagrams should not be thought of as being indicative of the ages of those stars or their interior composition or the "evolutionary processes" they are undergoing.
	www.electric-cosmos.org /hrdiagr.htm (7925 words)

	HR Diagram
		The color-magnitude diagram, often called the Hertzsprung-Russell (HR) diagram in their honor, has proved to be the Rosetta Stone of stellar astronomy.
		You can use the HR Diagram you constructed to find the distances to stars via the method of spectroscopic parallax.
		Use the spectral types and the HR diagram to estimate their absolute magnitudes.
	www.astro.washington.edu /labs/clearinghouse/homeworks/hrdiagram.html (887 words)

	HR Diagram
		Since the O stars are the hottest, this means that in the HR diagram, the temperature axis is odd in that the temperature decreases as one moves to the right.
		It is up to the theorists to explain why height and weight are related in the manner that they are.
		Similarly, it is clear that the HR diagram is telling us about how stars are put together (unfortunately, it is again up to theorists to tell us exactly what the HR diagram is telling us).
	zebu.uoregon.edu /~imamura/208/jan23/hr.html (744 words)

	hr diagram services , hr diagram providers , hr diagram resources
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	www.egy-learn.com /learning/learning_H_3/hr_diagram.htm (114 words)

	[No title]
		Giant stars and dwarf stars a paper by Russell in which he describes an early version of the HR diagram (the figure to which is lost, alas)
		He also noticed the difference in the other two corners of the diagram: there were some stars in the upper right, but very very few stars in the lower left.
		On the probable order of stellar evolution a paper by Russell, with early thoughts on the connection between the HR diagram and stellar evolution (which turned out to be wrong, but explains some of the jargon we still use)
	spiff.rit.edu /classes/phys301/lectures/hr/hr.html (1428 words)

	Intro Astronomy April 3
		Above is the textbook figure of the HR diagram of the Pleiades, the open cluster you can see in the constellation of Taurus.
		Above is the textbook figure of the HR diagram of a globular cluster.
		As described in the textbook, there is a special place on the HR diagram where stars tend to be variable.
	www.bramboroson.com /astro/apr3.html (1096 words)

	Properties of Stars
		The white dwarfs are at the opposite end in the lower left of the diagram.
		Distances to red giant and supergiant stars are found in a similar way but you need to investigate their spectra more closely to see if they are the very large stars you think they are.
		The entire color-magnitude diagram for the cluster is compared with a calibration cluster's color-magnitude diagram.
	www.astronomynotes.com /starprop/s13.htm (778 words)

	The Hipparcos and Tycho Catalogues: Hertzsprung-Russell Diagrams
		The Hertzsprung-Russell (HR) diagram is a two-dimensional plot of the luminosity of a star versus its colour.
		Each region of the HR diagram represents certain properties of the star, including its evolutionary stage.
		Fraction of stars that are variable in the HR diagram.
	www.rssd.esa.int /Hipparcos/TOUR/tour-hrdiagram.html (151 words)

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