H-R diagram


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H-R diagram

short for Hertzsprung–Russell diagram.

H-R diagram

[¦āch ′är ‚dī·ə‚gram]
References in periodicals archive ?
But his resulting diagram, made easier because all the stars in each cluster lie at about the same distance, looked very different from today's H-R diagram, because it had only one diagonal line.
We now know that each star reaches a place on the main sequence depending on its mass, and that it remains essentially there for its normal lifetime --shorter for hotter stars and longer for cooler stars--before it evolves up and to the right on the H-R diagram as the star expands into a giant.
A new study published in 2007, which took into account an improved understanding of the spacecraft's motions, led key Hipparcos team member Floor van Leeuwen (Cambridge University, UK) to an improved catalog and a more accurate H-R diagram for the 17,502 stars whose parallaxes are known to better than 7%.
Gaia will extend the H-R diagram to the lower right by measuring both cooler and fainter stars, and its more accurate measurements will provide much more detailed information on the main sequence.
Pasachoff has been lecturing about the H-R diagram since he started teaching at Williams College in 1972 and writing about it in his textbooks, most recently the 2014 edition of The Cosmos: Astronomy in the New Millennium.
As a result, the brighter a star in a globular's H-R diagram, the redder and "gianter" it is.
An H-R diagram I constructed for M13 from the professional catalogs in the publicly accessible VizieR database (http://vizier.
The first thing to notice is that my H-R diagram for M13 looks similar to the one produced from VizieR.
Such an H-R diagram for M5 is shown on the previous page.
Ejnar Hertzsprung and Henry Norris Russell independently constructed the first such plots nearly a century ago, and they are therefore today called Hertzsprung-Russell diagrams, or H-R diagrams.
It is somehow reassuring that I would place myself on the H-R diagram close to our own, quite average, Sun.
The object shoots across the H-R diagram in a matter of months and, in a triumphant encore, the star once again joins the AGB as a supergiant.