Joo, Seok-Joo; Kyeong, Jaemann; Yang, Soung-Chul; Han, Sang-Il; Sung, Eon-Chang; Rey, Soo-Chang; Jerjen, Helmut; Kim, Hak-Sub; Kim, Dongwon; Jeong, Hyunjin; Ree, Chang H.
We present the detection of RR Lyrae variable stars in the field of the Sagittarius. II (Sgr II) ultra-faint dwarf (UFD) galaxy. Using B, V time-series photometry obtained with the Korea Microlensing Telescope Network (KMTNet) 1.6 m telescope at CTIO and G-band data from Gaia Data Release 2 (DR2), we identified and characterized two ab-type and four c-type RR Lyrae variables. Five out of the six stars are clustered within three half-light radii (similar to 4'.8) of the galaxy indicating their...[Show more]
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