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THE DISCOVERY OF A VARIABLE STAR CANDIDATE – XM110HT

Hanjie Tan (AUUK), Guoyou Sun, Mi Zhang, Jiangao Ruan, Jingyuan Zhao (Xingming Obs), Quanzhi Ye (UMd), Xing Gao (Xingming Obs), report the discovery of a possible variable star at 16.64 Gmag on several 60-s survey images (limit mag about 18.5) taken by Xing Gao at Xingming Observatory #3 (N88) around 29.81720 Dec 2021 UTC using unfiltered CCD and PAT telescope (0.3-m f/3.6 reflector). The variable star is approximately located at RA= 06h21m49.36s, DEC = +27d11m23.5s (equinox 2000.0). Discovery images can be found at: http://xjltp.china-vo.org/xm110ht.html .

We found in ZTF data that the variable star was fainter than normal for some time in the past about 2 years. Similar to VVV-WIT-08 (VVV-WIT-08: the giant star that blinked https://arxiv.org/pdf/2106.05300.pdf) discovered last year. LAMOST’s spectrum shows that it is not a young star. We think its brightness change may be due to dust occlusion.

NET Gaia DR2
XM110HT C2021 12 29.81720 06 21 49.36 +27 11 23.5 16.64G N88
XM110HT C2021 12 29.82840 06 21 49.36 +27 11 23.4 16.78G N88

Light change curve

SED

spectrum form LAMOST
http://dr7.lamost.org/v2.0/spectrum/view?obsid=6810046