6 papers
Revisiting Ca II Activity Indices in FGK Stars: Systematic Biases in Infrared Triplet Measurements
Xiaozhen Yang, Xiaoting Fu, Mingjie Jian +10
Synthetic-template subtraction is widely used to measure chromospheric activity in large spectroscopic surveys. However, many solar-like FGK stars show systematically negative Ca I…
Searching for Magnetic White Dwarfs in LAMOST DR10
Si-Cheng Yu, Juan-Juan Ren, Vitaly V. Neustroev +7
Magnetic white dwarfs (MWDs) are key to understanding the origin and evolution of magnetic fields in compact stars. While large spectroscopic surveys such as SDSS have greatly expa…
The survey of DA double white dwarf candidates based on DESI EDR
Ziyue Jiang, Hailong Yuan, Zhongrui Bai +9
Mergers of double white dwarfs are considered significant potential progenitors of type Ia supernovae. Although there is no direct observational evidence to definitively determine…
The Nature of Classical Be Star Outbursts: A Multi-Epoch Study of the Be system EPIC 202060631
Qing Gao, Hailong Yuan
Through cross-matching the ASASSN photometric light curves and LAMOST spectroscopic observations, we serendipitously captured a rare major outburst event from the Be star EPIC 2020…
LAMOST J171013+532646: a detached short-period non-eclipsing hot subdwarf + white dwarf binary
Mingkuan Yang, Hailong Yuan, Zhongrui Bai +9
We present an analysis of LAMOST J171013.211+532646.04 (hereafter J1710), a binary system comprising a hot subdwarf B star (sdB) and a white dwarf (WD) companion. Multi-epoch spect…
A potential mass-gap black hole in a wide binary with a circular orbit
Wang Song, Zhao Xinlin, Feng Fabo +28
Mass distribution of black holes identified through X-ray emission suggests a paucity of black holes in the mass range of 3 to 5 solar masses. Modified theories have been devised t…