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Q: Which variable stars have pulsation periods between 1.5 hours and 1.2 days? A. Protostars B. RR Lyrae variables C. Nebulas D. Cepheid variables
A: 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
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Asked 6/20/2013 11:35:49 AM
Updated 10/23/2013 1:37:09 PM
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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 nebula is not a star
Added 10/23/2013 1:37:09 PM
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