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Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution

García, Rafael A.; Breton, Sylvain N.; Mathur, Savita +4 more

While the mission's primary goal was focused on exoplanet detection and characterization, Kepler made and continues to make extraordinary advances in stellar physics. Stellar rotation and magnetic activity are no exceptions. Kepler allowed for these properties to be determined for tens of thousands of stars from the main sequence up to the red gia…

A study on the metallicity gradients in the galactic disk using open clusters

Deepak; Malhotra, Sagar; Joshi, Yogesh Chandra

We study the metallicity distribution and evolution in the galactic disk based on the largest sample of open star clusters in the galaxy. From the catalog of 1,879 open clusters in the range of galactocentric distance (RGC) from 4 to 20 kpc, we investigate the variation in metallicity in the galactic disk as functions of RGC, vertical distance (Z)…

Evaluation of the astrometric capability of Multi-Channel Imager and simulated calculation of proper motion of M31

Peng, Xiyan; Liao, Shilong; Qi, Zhaoxiang +8 more

Introduction: The Multi-Channel Imager (MCI), one of the back-end modules of the future China Space Station Telescope (CSST), is designed for high-precision spacebased astronomical observations. This paper evaluates the astrometric capability of the MCI based on simulated observational images and Gaia data: the M31 galaxy is selected as a represen…

Investigation of a W UMa-type contact binary GZ And in a physical triple system

Zheng, Jie; Jiang, Lin-Qiao

GZ And is a variable star within the visually observed multiple-star system ADS 1693. Recent observations have yielded new light curves for GZ And, obtained using the Xinglong 85-cm telescope and the Transiting Exoplanet Survey Satellite (TESS) satellite. These light curves, along with radial velocity curves, were analyzed simultaneously to ascert…