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Period Change Similarities among the RR Lyrae Variables in Oosterhoff I and Oosterhoff II Globular Systems
Period Change Similarities among RR Lyrae Variables
2011/1/11
We present period change rates (dP/dt) for 42 RR Lyrae variables in the globular cluster IC$\,$4499. Despite clear evidence of these period increases or decreases, the observed period change rates are...
Studying old populations with RR Lyrae Variables in the Local Group
old populations RR Lyrae Variables Local Group
2009/6/12
Studying old populations with RR Lyrae Variables in the Local Group。