The Role of Binarity and Stellar Rotation in the Split Main Sequence of NGC 2422

  title={The Role of Binarity and Stellar Rotation in the Split Main Sequence of NGC 2422},
  author={Chenyu 辰昱 He 贺 and Weijia 唯佳 Sun 孙 and Chengyuan 程远 Li 李 and Lu 璐 Li 李 and Zhengyi 正义 Shao 邵 and Jing 靖 Zhong 钟 and Li 力 Chen 陈 and Richard de Grijs and Baitian 柏添 Tang 汤 and Songmei 松梅 Qin 秦 and Zara Randriamanakoto},
  journal={The Astrophysical Journal},
In addition to the extended main-sequence turnoffs widely found in young and intermediate-age (∼600 Myr to 2 Gyr old) star clusters, some younger clusters even exhibit split main sequences (MSs). Different stellar rotation rates are proposed to account for the bifurcated MS pattern, with red and blue MSs (rMS and bMS) populated by fast and slowly rotating stars, respectively. Using photometry from Gaia Early Data Release 3, we report a Galactic open cluster with a bifurcated MS, NGC 2422 (∼90… 



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