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RR Lyrae stars are pulsating stars, many of which also show a long-termvariation called the Blazhko effect which is a modulation of amplitude andphase of the lightcurve. In this work, we searched for the incidence rate ofthe Blazhko effect in the first-overtone pulsating RR Lyrae (RRc) stars of theGalactic halo. The focus was on the Stripe 82 region in the Galactic halo whichwas studied by Sesar et al using the Sloan Digital Sky Survey (SDSS) data. Intheir work, 104 RR Lyrae stars were classified as RRc type. We combined theirSDSS light curves with Zwicky Transient Facility (ZTF) data, and use them todocument the Blazhko properties of these RRc stars. Our analysis showed thatamong the 104 RRc stars, 8 were rather RRd stars, and were excluded from thestudy. Out of remaining 96, 34 were Blazhko type, 62 were non-Blazhko type,giving the incidence rate of 35.42% for Blazhko RRc stars. The shortest Blazhkoperiod found was 12.808 +/- 0.001 d for SDSS 747380, while the longest was 3100+/- 126 d for SDSS 3585856. Combining SDSS and ZTF data sets increased theprobability of detecting the small variations due to the Blazhko effect, andthus provided a unique opportunity to find longer Blazhko periods. We foundthat 85% of RRc stars had the Blazhko period longer than 200 d.

Study of the Blazhko type RRc stars in the Stripe 82 region using SDSS and ZTF