An Etymological Dictionary of Astronomy and Astrophysics

7 terms — W › WC

W WA WC WE WH WI WN WO WR WZ

WC Wolf-Rayet   وُلف-رایه‌ی ِ WC   Wolf-Rayet-e WC Fr.: Wolf-Rayet WC A → Wolf-Rayet star whose spectrum is dominated by emission lines of ionized carbon: C III 5696 Å, C III / C IV 4650 Å, C IV 5801-12 Å. This type is divided in sub-types WC4 to WC9. For theoretical models, a Wolf-Rayet star whose carbon abundance at surface is larger than nitrogen abundance and has the abundance ratio (C + O) / He < 1 (in number). See also: W short for Wolf-Rayet star, C for → carbon.

WC4 star   ستاره‌ی WC4   setâre-ye WC4 Fr.: étoile WC4 A → WC Wolf-Rayet that its spectrum shows the following emission line characteristics: strong C IV 5801-12 Å, weak or absent C II 4267 Å, and moderate O V 5572-98 Å. See also: W, from → Wolf-Rayet; C, from → carbon; → star.

WC5 star   ستاره‌ی WC5   setâre-ye WC5 Fr.: étoile WC5 A → WC Wolf-Rayet whose spectrum shows the following emission line characteristics: C III 5696 Å very weaker than C IV 5801-12 Å and C III weaker than O V 5572-98 Å. See also: W, from → Wolf-Rayet; C, from → carbon; → star.

WC6 star   ستاره‌ی WC6   setâre-ye WC6 Fr.: étoile WC6 A → WC Wolf-Rayet whose spectrum shows the following emission line characteristics: C III 5696 Å very weaker than C IV 5801-12 Å and C III stronger than O V 5572-98 Å. See also: W, from → Wolf-Rayet; C, from → carbon; → star.

WC7 star   ستاره‌ی WC7   setâre-ye WC7 Fr.: étoile WC7 A → WC Wolf-Rayet with a spectrum shows the following emission line characteristics: C III 5696 Å weaker than C IV 5801-12 Å and C III very stronger than O V 5572-98 Å. See also: W, from → Wolf-Rayet; C, from → carbon; → star.

WC8 star   ستاره‌ی WC8   setâre-ye WC8 Fr.: étoile WC8 A → WC Wolf-Rayet with a spectrum shows the following emission line characteristics: C III 5696 Å stronger than C IV 5801-12 Å, C II 4267 Å absent, and O V 5572-98 Å weak or absent. See also: W, from → Wolf-Rayet; C, from → carbon; → star.

WC9 star   ستاره‌ی WC9   setâre-ye WC9 Fr.: étoile WC9 A → WC Wolf-Rayet whose spectrum shows the following emission line characteristics: C III 569 Å stronger than C IV 5801-12 Å, C II 4267 Å present, and O V 5572-98 Å weak or absent. See also: W, from → Wolf-Rayet; C, from → carbon; → star.