[hairt-sproo ng-ruhs-uh l] /ˈhɛərt sprʊŋˈrʌs əl/
the graph showing the absolute magnitude plotted against the surface temperature for a group of stars.
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 See also main sequence
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.
[hurts-burg] /ˈhɜrts bɜrg/ noun 1. Gerhard [gair-hahrd,, -hahrt] /ˈgɛər hɑrd,, -hɑrt/ (Show IPA), 1904–1999, Canadian physicist, born in Germany: Nobel Prize in Chemistry 1971.
[her-tsuh-goh-vee-nuh] /ˌhɛr tsə goʊˈvi nə/ noun 1. a historic region in SE Europe: a former Turkish province; a part of Austria-Hungary 1878–1914; now part of . /ˌhɜːtsəɡəʊˈviːnə/ noun 1. a region in Bosnia-Herzegovina: originally under Austro-Hungarian rule; became part of the province of Bosnia-Herzegovina (1878), which was a constituent republic of Yugoslavia (1946–92) former Austrian […]
/Russian ˈɡjɛrtsən/ noun 1. Aleksandr (Ivanovich) (alɛkˈsandr iˈvaːnovitʃ). 1812–70, Russian socialist political philosopher: best known for his autobiography My Past and Thoughts (1861–67)
[hurt-sog, hur-zog; French er-zawg for 2] /ˈhɜrt sɒg, ˈhɜr zɒg; French ɛrˈzɔg for 2/ noun 1. Chaim [khahy-im] /ˈxaɪ ɪm/ (Show IPA), 1918–97, Israeli political leader: president 1983–1997. 2. Maurice, 1919–2012, French mountaineer: climbed Annapurna 1950. /German ˈhɛrtsoːk/ noun 1. Roman. born 1934, German politician; president of Germany (1994–99) 2. Werner (ˈvɛrnər). born 1942, German […]