Hertzsprung–Russell diagramn.

Brit.

/ˌhəːtsprʌŋˌrʌsl ˈdʌɪəɡram/, U.S.

/ˈˌhərtˌsprəŋˈrəsəl ˈˌdaɪəˌɡræm/

Origin: From proper names, combined with an English element. Etymons: proper name Hertzsprung , Russell , diagram n.

Etymology: < the names of Ejnar Hertzsprung (see Hertzsprung n.) and Henry Norris Russell (1877–1957), U.S. astrophysicist, who constructed the diagram + diagram n.The diagram was constructed and presented in a lecture by Russell in 1913 ( Pop. Astron. (1914) 22 275) and subsequently known as the Russell diagram until it was realized that such a diagram had previously been constructed by Hertzsprung in 1911 ( Publ. d. Astrophysikalischen Observatoriums zu Potsdam No. 63.) for two star clusters in the constellation Taurus.

Astronomy.

A graph on which stars (esp. those in a galaxy or cluster) are plotted according to their brightness and spectral type, typically with decreasing visual magnitude (increasing luminosity) on the vertical axis and spectral class (decreasing surface temperature) on the horizontal axis. Formerly also called Russell diagram.

ΘΚΠ

the world > relative properties > number > graph or diagram > [noun] > graph > showing specific relationship

characteristic1881

characteristic curve1881

time curve1883

luminosity curve1886

hysteresis curve1890

hysteresis loop1892

time-distance1892

solidus1901

power curve1908

log log1910

Russell diagram1922

creep curve1931

power curve1932

Hertzsprung–Russell diagram1939

Petersen graph1947

utility curve1948

tournament graph1959

offset1987

1928 J. H. Jeans Astron. & Cosmogony vi. 175 The normal evolutionary track of a star must be thought of as a curved line..of the general type indicated on a Russell diagram.]

1939 S. Chandrasekhar Introd. Study Stellar Struct. vii. 251 These computed values..give a general interpretation of the characteristic features summarized in the Hertzsprung-Russell diagram.

1942 W. M. Smart Found. Astron. xii. 216 If the short time-scale is finally accepted, the evolutionary course suggested by the Hertzsprung-Russell diagram must be discarded and the diagram itself regarded as an unexplained statistical relation between absolute magnitude and spectral type.

1989 M. Longair in P. Davies New Physics vi. 110/2 The stars occupy quite specific regions of this luminosity-temperature diagram..which is also known as a Hertzsprung-Russell (or H-R) diagram, or, equivalently, as a colour-magnitude diagram.

1997 Proc. National Acad. Sci. U.S.A. 94 4839 The ages determined for globular clusters are fundamentally dependent on the ability to identify the luminosity of the turnoff in an [sic] Hertzsprung–Russell diagram.

This is a new entry (OED Third Edition, March 2002; most recently modified version published online March 2022).

单词	hertzsprung–russell diagram
释义	Hertzsprung–Russell diagramn. Brit. /ˌhəːtsprʌŋˌrʌsl ˈdʌɪəɡram/, U.S. /ˈˌhərtˌsprəŋˈrəsəl ˈˌdaɪəˌɡræm/ Origin: From proper names, combined with an English element. Etymons: proper name Hertzsprung , Russell , diagram n. Etymology: < the names of Ejnar Hertzsprung (see Hertzsprung n.) and Henry Norris Russell (1877–1957), U.S. astrophysicist, who constructed the diagram + diagram n.The diagram was constructed and presented in a lecture by Russell in 1913 ( Pop. Astron. (1914) 22 275) and subsequently known as the Russell diagram until it was realized that such a diagram had previously been constructed by Hertzsprung in 1911 ( Publ. d. Astrophysikalischen Observatoriums zu Potsdam No. 63.) for two star clusters in the constellation Taurus. Astronomy. A graph on which stars (esp. those in a galaxy or cluster) are plotted according to their brightness and spectral type, typically with decreasing visual magnitude (increasing luminosity) on the vertical axis and spectral class (decreasing surface temperature) on the horizontal axis. Formerly also called Russell diagram. ΘΚΠ the world > relative properties > number > graph or diagram > [noun] > graph > showing specific relationship characteristic1881 characteristic curve1881 time curve1883 luminosity curve1886 hysteresis curve1890 hysteresis loop1892 time-distance1892 solidus1901 power curve1908 log log1910 Russell diagram1922 creep curve1931 power curve1932 Hertzsprung–Russell diagram1939 Petersen graph1947 utility curve1948 tournament graph1959 offset1987 1928 J. H. Jeans Astron. & Cosmogony vi. 175 The normal evolutionary track of a star must be thought of as a curved line..of the general type indicated on a Russell diagram.] 1939 S. Chandrasekhar Introd. Study Stellar Struct. vii. 251 These computed values..give a general interpretation of the characteristic features summarized in the Hertzsprung-Russell diagram. 1942 W. M. Smart Found. Astron. xii. 216 If the short time-scale is finally accepted, the evolutionary course suggested by the Hertzsprung-Russell diagram must be discarded and the diagram itself regarded as an unexplained statistical relation between absolute magnitude and spectral type. 1989 M. Longair in P. Davies New Physics vi. 110/2 The stars occupy quite specific regions of this luminosity-temperature diagram..which is also known as a Hertzsprung-Russell (or H-R) diagram, or, equivalently, as a colour-magnitude diagram. 1997 Proc. National Acad. Sci. U.S.A. 94 4839 The ages determined for globular clusters are fundamentally dependent on the ability to identify the luminosity of the turnoff in an [sic] Hertzsprung–Russell diagram. This is a new entry (OED Third Edition, March 2002; most recently modified version published online March 2022). < n.1939
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