H-R diagramn.

Brit.

/ˌeɪtʃˈɑː ˌdʌɪəɡram/, U.S.

/ˌeɪtʃˈɑr ˌdaɪəˌɡræm/

Origin: Formed within English, by compounding. Etymons: English Hertzsprung–Russell , diagram n.

Etymology: < the initial letters of Hertzsprung–Russell + diagram n., as shortened form of Hertzsprung–Russell diagram n.

Astronomy.

= Hertzsprung–Russell diagram n.

ΚΠ

1939 S. Chandrasekhar Introd. Study Stellar Struct. vii. 285 The stars of large mass..scatter over a large area in the H.R. diagram.

1944 Astrophysical Jrnl. 100 137 The well-known H-R diagram of the stars in our solar neighbourhood.

1992 S. P. Maran Astron. & Astrophysics Encycl. 65/1 For the systems in star clusters, the locations of the components in the cluster H-R diagram will indicate the age of the systems.

2003 J. Scalzi Rough Guide to Universe xii. 170 Stars that are in the top left corner of the H-R diagram are the hottest and most luminous stars in the sky.

This is a new entry (OED Third Edition, June 2012; most recently modified version published online March 2022).

单词	h-r diagram
释义	H-R diagramn. Brit. /ˌeɪtʃˈɑː ˌdʌɪəɡram/, U.S. /ˌeɪtʃˈɑr ˌdaɪəˌɡræm/ Origin: Formed within English, by compounding. Etymons: English Hertzsprung–Russell , diagram n. Etymology: < the initial letters of Hertzsprung–Russell + diagram n., as shortened form of Hertzsprung–Russell diagram n. Astronomy. = Hertzsprung–Russell diagram n. ΚΠ 1939 S. Chandrasekhar Introd. Study Stellar Struct. vii. 285 The stars of large mass..scatter over a large area in the H.R. diagram. 1944 Astrophysical Jrnl. 100 137 The well-known H-R diagram of the stars in our solar neighbourhood. 1992 S. P. Maran Astron. & Astrophysics Encycl. 65/1 For the systems in star clusters, the locations of the components in the cluster H-R diagram will indicate the age of the systems. 2003 J. Scalzi Rough Guide to Universe xii. 170 Stars that are in the top left corner of the H-R diagram are the hottest and most luminous stars in the sky. This is a new entry (OED Third Edition, June 2012; most recently modified version published online March 2022). < n.1939
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