44 citations · 108 across the 15 of their papers we have counts for
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Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi
Cao Dongtao, Gu shenghong
Stellar flares are frequently accompanied by prominence eruptions, coronal mass ejections (CMEs), and other forms of plasma motion. Based on the long-term high-resolution spectrosc…
Further Investigation on Chromospheric Activity Patterns of the RS Canum Venaticorum Star V711 Tauri
Cao Dongtao, Gu Shenghong
We present new long-term spectroscopic observations of the very active RS Canum Venaticorum (RS CVn) star V711 Tauri (V711 Tau), obtained during several observing runs from 2005 to…
A Possible Stellar CME Event Associated with a Long-duration Optical Flare on the RS CVn-type Star UX Arietis
Cao Dongtao, Gu Shenghong
Coronal mass ejections (CMEs) are large-scale eruptions of magnetized plasma from stellar coronae, and they are always accompanied by flares. In this study, we present high-resolut…
Investigating Possible Stellar Coronal Mass Ejections in M-type Dwarfs Using the CARMENES DR1 Spectra
Cao Dongtao, Gu Shenghong
Stellar coronal mass ejections (CMEs) have significant impacts on surrounding exoplanets and stellar evolution. For M-type dwarf stars, hosting close-in habitable zones, frequent a…
Starspot activity and surface differential rotation on UX Arietis
Yue Xiang, Shenghong Gu, A. Collier Cameron +2
We present new Doppler images of the K0 subgiant primary component of the RS CVn-type binary UX Arietis (UX Ari), derived from time-series spectra obtained in November--December of…
Magnetic activity of ultracool dwarfs in the LAMOST DR11
Yue Xiang, Shenghong Gu, Dongtao Cao
Ultracool dwarfs consist of lowest-mass stars and brown dwarfs. Their interior is fully convective, different from that of the partly-convective Sun-like stars. Magnetic field gene…
Further study of starspot activity and measurement of differential rotation for SZ Piscium
Yue Xiang, Shenghong Gu, A. Collier Cameron +2
We present a series of 9 Doppler images of the magnetically active K component of the RS CVn-type binary SZ Psc, based on the high-resolution spectroscopic data collected from 2014…
Red Asymmetry of H Line Profiles during the flares on the active RS CVn-type star II Pegasi
Dongtao Cao, Shenghong Gu
Stellar coronal mass ejections (CMEs) have recently attracted much attention for their impacts on stellar evolution and surrounding exoplanets. RS CVn-type stars could produce larg…
Prominence activation, optical flare, and post-flare loops on the RS Canum Venaticorum star SZ Piscium
Dongtao Cao, Shenghong Gu, Jian Ge +7
We present the results of time-resolved high-resolution spectroscopic observations of the very active RS Canum Venaticorum (RS CVn) star SZ Piscium (SZ Psc), obtained during two co…
Magnetic activities on two single-lined RS Canum Venaticorum binaries IM Pegasi and Geminorum
Dongtao Cao, Shenghong Gu, F. Grundahl +1
We present the study on continuous high-resolution spectroscopic observations of two long-period single-lined RS Canum Venaticorum (RS CVn) binary stars IM Pegasi (IM Peg) and …
Prominence detection and chromosphere feature on the prototype RS CVn of active binary systems
Dongtao Cao, Shenghong Gu, U. Wolter +4
We present a study of high-resolution spectra of RS Canum Venaticorum (RS CVn), a prototype of active binary systems. Our data were obtained from 1998 to 2017 using different teles…
Investigation of stellar magnetic activity using variational autoencoder based on low-resolution spectroscopic survey
Yue Xiang, Shenghong Gu, Dongtao Cao
We apply the variational autoencoder (VAE) to the LAMOST-K2 low-resolution spectra to detect the magnetic activity of the stars in the K2 field. After the training on the spectra o…
Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra
Hong-peng Lu, Hui Tian, Li-yun Zhang +9
Context. Stellar coronal mass ejections (CMEs) are the primary driver of the exoplanetary space weather and they could affect the habitability of exoplanets. However, detections of…