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g -band light curves of an ab-(top) and a c-type (bottom) RR Lyrae star in the And IX dSph. Period and type are labeled.  

g -band light curves of an ab-(top) and a c-type (bottom) RR Lyrae star in the And IX dSph. Period and type are labeled.  

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Fig. 2. g -band light curves of an ab-(top) and a c-type (bottom) RR...
Fig. 3. CMD of the And IX galaxy, based on the average PSF photometry...
Stellar archaeology in the M31 HALO
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  • May 2013
We present results on the study of the variable stars and stellar populations of the Andromeda IX (And IX) dwarf spheroidal companion of M31, based on g', r' time-series photometry we obtained as part of our ESO Large Program 186.D-2013 at the Gran Telescopio Canarias (GTC; PI G. Clementini). More than twenty RR Lyrae stars were discovered in And I...
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... are mainly RR Lyrae stars. As an example of the quality of the data, in Figure 2 we show the g -band light curves of a fundamental mode (RRab) and of a first overtone (RRc) RR Lyrae of And IX. The two variable stars have periods of 0.65 and 0.30 days, respectively. ...

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