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noun Astronomy.
the graph showing the absolute magnitude plotted against the surface temperature for a group of stars.
Also called H-R diagram.
Origin:
after Danish astronomer Ejnar Hertzsprung (1873–1967) and H. N. Russell, who compiled the data on which it is based
after Danish astronomer Ejnar Hertzsprung (1873–1967) and H. N. Russell, who compiled the data on which it is based
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hertzsprung-russell diagram
is always a great word to know.
So is rotation. Does it mean:
| the movement or path of the earth or a heavenly body turning on its axis |
| marking the time when the sun is at the north most point from the celestial equator occurring around June 21 |
Collins
World English Dictionary
| Hertzsprung-Russell diagram (ˈhɜːtssprʌŋˈrʌsəl) | |
| —n | |
| See also main sequence a graph in which the spectral types of stars are plotted against their absolute magnitudes. Stars fall into different groupings in different parts of the graph | |
| [C20: named after Ejnar | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
| Hertzsprung-Russell diagram
A graph in which the absolute magnitude (intrinsic luminosity) of stars is plotted vertically against their surface temperatures (or corresponding spectral types). The diagram shows a strong correlation between luminosity and surface temperature among the average-size stars known as dwarfs, with hot, blue stars having the highest luminosities and relatively cool, red stars having the lowest. The roughly diagonal line (running from the upper left of the diagram to the lower right) that shows this correlation is called the main sequence. Giant and supergiant stars have relatively high luminosities for their surface temperatures and are positioned on the diagram above the main sequence. The faint white dwarfs have relatively low luminosities for their surface temperatures and cluster below the main sequence. See more at main sequence. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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