Census of Variable Stars toward Serpens Main
Jia Yin, Zhiwei Chen, Rolf Chini, Martin Haas, Sadegh Noroozi,, Yongqiang Yao, Zhibo Jiang, Xuan Qian, Liyong Liu, and Yao Li

TL;DR
This study conducted a comprehensive variability survey of over 11,000 stars in Serpens Main, discovering 119 new variable stars, classifying their types, and analyzing their physical and variability properties using multi-band photometry and Gaia data.
Contribution
First large-scale variability survey of Serpens Main using Pan-STARRS1 data, identifying new variables and analyzing their properties and cluster membership.
Findings
119 new variable stars discovered
Most variables are long-period giants or short-period pre-main-sequence stars
Eight eclipsing binaries identified and characterized
Abstract
We have monitored a 3 deg2 area toward Serpens Main in the Pan-STARRS1 r, i, and z bands from 2016 April to September. Light curves of more than 11,000 stars in each band were obtained, and 143 variables have been identified. Among those, 119 variables are new discoveries, while 24 variables were previously known. We present variability classes and periods of 99 stars. Of these, 81 are located in the upper giant branch, displaying long periods, while the remaining 18 variables are pre-main-sequence objects with short periods. We also identify eight eclipsing binary systems, including the known binary V0623 Ser, and derive their physical parameters. According to a clustering analysis of Gaia DR2 stars in the observed field, there are 10 variable members in Serpens Main, where six members have been classified as young stellar objects in previous studies. Here we provide color-magnitude…
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