w virginis variable造句

• Such stars will pulsate as W Virginis variables and again may be classified as relatively low luminosity yellow supergiants.
• "' W Virginis "'is the prototype W Virginis variable, a subclass of the Cepheid variable stars.
• W Virginis variables are thought to be AGB stars executing a blue loop due to a thermal pulse from the helium burning shell.
• RU Cam remained a somewhat unusual W Virginis variable until 1964, when the relatively regular pulsation of about 1 magnitude almost entirely stopped.
• In the Population II stars this irregularity gradually increases from the low period W Virginis variables through the RV Tauri variables into the regime of the semiregular variables.
• The majority of AGB stars are given giant or bright giant luminosity classes, but particularly unstable stars such as W Virginis variables may be given a supergiant classification ( e . g.
• Two distinct types of Cepheid variable have been identified, which have different period-luminosity relationships : Classical Cepheid variables are young massive population I stars; type II Cepheids are older population II stars with low masses, including W Virginis variables, BL Herculis variables and RV Tauri variables.