RCW catalogue kâtâlog-e RCW Fr.: catalogue RCW A catalog of → H II regions in the → southern → Milky Way based on observations obtained at Mount Stromlo Observatory (Australia). It contains 181 → H-alpha emission objects characterized by their positions, dimensions, and estimated brightness. Rodgers,A.W., Campbell, C.T., Whiteoak, J.B., 1960, MNRAS, 121, 103; → catalog. |
WC Wolf-Rayet 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. W short for Wolf-Rayet star, C for → carbon. |
WC4 star 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. W, from → Wolf-Rayet; C, from → carbon; → star. |
WC5 star 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. W, from → Wolf-Rayet; C, from → carbon; → star. |
WC6 star 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. W, from → Wolf-Rayet; C, from → carbon; → star. |
WC7 star 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. W, from → Wolf-Rayet; C, from → carbon; → star. |
WC8 star 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. W, from → Wolf-Rayet; C, from → carbon; → star. |
WC9 star 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. W, from → Wolf-Rayet; C, from → carbon; → star. |
WN/WC star setâre-ye WN/WC Fr.: étoile WN/WC An object showing signatures of both → WN Wolf-Rayet stars and → WC Wolf-Rayet stars in the same spectrum, originating from individual stars rather than from WN + WC → binary systems. Such a WN/WC signature implies that the surface composition of the star is → nitrogen and → carbon enriched. This hybrid state results from a mixing process between He-burning → convective core and the overlying nitrogen enriched layers. According to model predictions, this situation corresponds to a short transition phase, lasting 103 to 104 years, during which a WN star evolves into a WC star. The WN/WC stars so far detected are all of early types. → WN Wolf-Rayet; → WC Wolf-Rayet. |