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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 , 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 .

Wenjie Zhou is responsible for updating data, conducting further research, and update variability type of it.

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.  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 curve

SED information

spectrum form LAMOST
https://www.lamost.org/dr8/v2.0/spectrum/view?obsid=6810046