Search Publications
Missions
Journals
Publication Years
Imaging and spectroscopic observations of a confined solar filament eruption with two-stage evolution
Xu, Zhe; Xue, Zhike; Yan, Xiaoli +3 more
Solar filament eruptions are often characterized by stepwise evolution due to the involvement of multiple mechanisms, such as magnetohydrodynamic instabilities and magnetic reconnection. In this article, we investigated a confined filament eruption with a distinct two-stage evolution by using the imaging and spectroscopic observations from the Int…
Identification of A-type supergiants from LAMOST DR5
Liu, Chao; Liu, Zhicun; Cui, Wenyuan +7 more
We present a new method for selecting A-type supergiants (A-SGs hereafter) in the LAMOST DR5 data set using the line indices, and identify 40 spectra of 30 A-SG candidates. Based on the analysis of the absolute magnitude of Gaia DR3, SIMBAD data base, ZTF light variation data, and spectral characteristics of A-SGs, we classified the 30 A-SG candid…
SRG/eROSITA 3D mapping of the interstellar medium using X-ray absorption spectroscopy
Czesla, S.; Kallman, T. R.; Wilms, J. +6 more
We present a detailed study of the hydrogen density distribution in the local interstellar medium (ISM) using the X-ray absorption technique. Hydrogen column densities were precisely measured by fitting X-ray spectra from coronal sources observed during the initial eROSITA all-sky survey (eRASS1). Accurate distance measurements were obtained throu…
Using Polar Faculae to Determine the Sun's High-latitude Rotation Rate. I. Techniques and Initial Measurements
Sheeley, Neil R.
This paper describes a new way of determining the high-latitude solar rotation rate statistically from simultaneous observations of many polar faculae. In this experiment, I extracted frames from a movie made previously from flat-fielded images obtained in the 6767 Å continuum during 1997–1998 February and used those frames to construct spacetime …
Dynamical Mass of the Ophiuchus Intermediate-mass Stellar System S1 with DYNAMO-VLBA
Dupuy, Trent J.; Rodríguez, Luis F.; Loinard, Laurent +8 more
We report dynamical mass measurements of the individual stars in the most luminous and massive stellar member of the nearby Ophiuchus star-forming region, the young tight binary system S1. We combine 28 archival data sets with seven recent proprietary Very Long Baseline Array (VLBA) observations obtained as part of the Dynamical Masses of Young St…
Large Eruptive and Confined Flares in Relation to the Solar Active Region Evolution
Liu, Yu; Wang, Huaning; Rao, Changhui +5 more
Solar active regions (ARs) provide the required magnetic energy and the topology configuration for flares. Apart from conventional static magnetic parameters, the evolution of AR magnetic flux systems should have nonnegligible effects on magnetic energy store and the trigger mechanism of eruptions, which would promote the prediction for the flare …
Coupling between magnetic reconnection, energy release, and particle acceleration in the X17.2 2003 October 28 solar flare
Veronig, Astrid M.; Hinterreiter, Jürgen; Fleishman, Gregory D. +3 more
Context. The 2003 October 28 (X17.2) eruptive flare was a unique event. The coronal electric field and the π-decay γ-ray emission flux displayed the highest values ever inferred for solar flares.
Aims: Our aim is to reveal physical links between the magnetic reconnection process, energy release, and acceleration of electrons and ions to high …
Spectral analysis of three hot subdwarf stars: EC 11481-2303, Feige 110, and PG 0909+276. A critical oscillator-strength evaluation for iron-group elements
Rauch, T.; Werner, K.; Landstorfer, A.
Context. For the precise spectral analysis of hot stars, advanced stellar-atmosphere models that consider deviations from the local thermodynamic equilibrium are mandatory. This requires accurate atomic data to calculate all transition rates and occupation numbers for atomic levels in the considered model atoms, not only for a few prominent lines …
The double low-mass white dwarf eclipsing binary system J2102-4145 and its possible evolution
Dhillon, V. S.; Marsh, T. R.; Littlefair, S. P. +7 more
In recent years, about 150 low-mass white dwarfs (WDs), typically with masses below 0.4 M⊙, have been discovered. The majority of these low-mass WDs are observed in binary systems as they cannot be formed through single-star evolution within Hubble time. In this work, we present a comprehensive analysis of the double low-mass WD eclipsi…
The Plasma β in Quiet Sun Regions: Multi-instrument View
Veronig, Astrid; Podladchikova, Tatiana; Gömöry, Peter +4 more
A joint campaign of several spaceborne and ground-based observatories, such as the GREGOR solar telescope, the Extreme-ultraviolet Imaging Spectrometer (EIS), and the Interface Region Imaging Spectrograph (Hinode Observing Plan 381, 2019 October 11–22) was conducted to investigate the plasma β in quiet Sun regions. In this work, we focus on 2019 O…