|æ or Æ1|
|1.||a digraph in Latin representing either a native diphthong, as in æquus, or a Greek αι (ai) in Latinized spellings, as in æschylus: now usually written ae, or e in some words, such as demon|
|2.||a ligature used in Old and early Middle English to represent the vowel sound of a in cat|
|3.||a ligature used in modern phonetic transcription also representing the vowel sound a in cat|
|Æ or Æ1|
|Russell (rŭs'əl) Pronunciation Key
American astronomer who studied binary stars and developed methods to calculate their mass and distances. Working independently of Ejnar Hertzsprung, Russell also demonstrated the relationship between types of stars and their absolute magnitude. This correlation is now known as the Hertzsprung-Russell diagram.