Which variable stars have pulsation periods between 1.5 hours and 1.2 days?
B. RR Lyrae variables
D. Cepheid variables
The stars that have pulsation periods between 1.5 hours and 1.2 days are C. RR Lyrae variables "Their period is shorter, typically less than one day, sometimes ranging down to seven hours." The others : A. Cepheid variables - have periods of many days B. Protostars - are variable in the T-Tauri stage, but they are very hard to observe for most observers and period is longer D. Nebulas - a
Asked 302 days ago|6/20/2013 11:35:49 AM
Updated 177 days ago|10/23/2013 1:37:09 PM