Search Publications
Missions
Journals
Publication Years
A comprehensive study of the dust declines in R Coronae Borealis stars
Bedding, Timothy R.; Lee, Chung-Uk; Clayton, Geoffrey C. +4 more
The R Coronae Borealis (RCB) variables are rare, hydrogen-deficient, carbon-rich supergiants known for large, erratic declines in brightness due to dust formation. Recently, the number of known RCB stars in the Milky Way and Magellanic Clouds has increased from
CHEOPS observations confirm nodal precession in the WASP-33 system
Alonso, R.; Deleuil, M.; Erikson, A. +86 more
Aims. We aim to observe the transits and occultations of WASP-33 b, which orbits a rapidly rotating δ Scuti pulsator, with the goal of measuring the orbital obliquity via the gravity-darkening effect, and constraining the geometric albedo via the occultation depth. Methods. We observed four transits and four occultations with CHEOPS, and employ a …
Optical flares detected on a contact binary: the first photometric and spectroscopic analysis of a long-period low mass ratio contact binary HAT 307-0007476
Esamdin, Ali; Li, Kai; Gao, Xing +12 more
This paper presents the photometric and spectroscopic analysis of a long-period totally eclipsing contact binary (HAT 307-0007476) for the first time. This system is a low mass ratio (
Testing the Flux Rope Paradigm for Coronal Mass Ejections Using a Three-spacecraft Encounter Event
Hess, Phillip; Wood, Brian E.
We present a 3D morphological and field reconstruction of a coronal mass ejection (CME) from 2023 November 28, which hits three spacecraft near 1 au: Wind at Earth's L1 Lagrange point, STEREO-A with a longitudinal separation of 6
Quadratic Magnetic Gradients From Seven- And Nine-Spacecraft Constellations
Shen, Chao; Kieokaew, Rungployphan; Zeng, Gang +1 more
To uncover the dynamics of magnetized plasma, it is crucial to determine the geometric structure of the magnetic field, which depends on its linear and quadratic spatial gradients. Estimating the linear magnetic gradient requires at least 4 simultaneous magnetic measurements, while calculating the quadratic gradients generally requires at least 10…
Toward Early-type Eclipsing Binaries as Extragalactic Milestones. IV. Physical Properties of Three Detached O/B-type Systems in the LMC
Thompson, I. B.; Puls, J.; Urbaneja, M. A. +10 more
We present a complete set of physical parameters for three early-type eclipsing binary systems in the Large Magellanic Cloud (LMC): OGLE LMC-ECL-17660, OGLE LMC-ECL-18794, and HV 2274, together with the orbital solutions. The first and third systems comprise B-type stars, while the second has O-type components and exhibits a total eclipse. We perf…
Multiple stellar populations at less evolved stages: IV. Evidence of helium enrichments in four Magellanic globular clusters
Wang, Li; Li, Chengyuan; Ji, Xin +1 more
Most globular clusters in the local group show multiple stellar populations, a pattern defined by variations of several light elements, with some also displaying dispersions in heavy elements. Since helium is the most immediate product of hydrogen burning, almost all models suggest that second-generation stars should show different levels of heliu…
The Eruptive Duality of a Filament on 2023 April 21
Zhang, Jun; Fang, Yue
Here we study a filament eruption on 2023 April 21. The filament was composed of two segments, named S1 and S2. Initially, the brightening and bidirectionally plasmoid flows appeared inside S1, and then the west part of S1 (WS1) experienced rapid rising and eruption, accompanied by coronal dimming, flare ribbons, and a secondary flare ribbon. Howe…
LAMOST Medium-resolution Spectroscopic Survey of Galactic Open Clusters (LAMOST-MRS-O): An Overview of Survey Plan and Preliminary Results
Shi, Jianrong; Chen, Li; Zhang, Xi +8 more
As part of the LAMOST medium-resolution spectroscopic survey, the LAMOST-MRS-O is a non-time domain survey that aims to perform medium-resolution spectral observations for member stars in the open cluster areas. This survey plans to obtain the spectroscopic parameters such as radial velocity and metal abundances of member stars and provide data su…
From Foreshock 30-Second Waves to Magnetospheric Pc3 Waves
Kajdič, Primož; Pfau-Kempf, Yann; Turc, Lucile +7 more
Ultra-low frequency waves, with periods between 1-1000 s, are ubiquitous in the near-Earth plasma environment and play an important role in magnetospheric dynamics and in the transfer of electromagnetic energy from the solar wind to the magnetosphere. A class of those waves, often referred to as Pc3 waves when they are recorded from the ground, wi…