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Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
Prusti, T.; Mazeh, T.; Zucker, S. +402 more
Diffuse interstellar bands (DIBs) are absorption features seen in optical and infrared spectra of stars and extragalactic objects that are probably caused by large and complex molecules in the galactic interstellar medium (ISM). Here we investigate the Galactic distribution and properties of two DIBs identified in almost six million stellar spectr…
Multi-point study of the energy release and impulsive CME dynamics in an eruptive C7 flare
Krucker, Säm; Veronig, Astrid M.; Podladchikova, Tatiana +6 more
Context. The energy release in eruptive flares and the kinematics of the associated coronal mass ejections (CMEs) are interlinked and require favorable observing positions as both on-disk and off-limb signatures are necessary to characterize these events.
Aims: We combine observations from different vantage points to perform a detailed study …
Sustained Heating of the Chromosphere and Transition Region Over a Sunspot Light Bridge
Mathew, Shibu K.; Louis, Rohan E.; Beck, Christian +2 more
Sunspot light bridges (LBs) exhibit a wide range of short-lived phenomena in the chromosphere and transition region. In contrast, we use here data from the Multi-Application Solar Telescope (MAST), the Interface Region Imaging Spectrograph (IRIS), Hinode, the Atmospheric Imaging Assembly (AIA), and the Helioseismic and Magnetic Imager (HMI) to ana…
Lateral Confinement and the Remarkably Self-similar Nature of Coronal Pseudostreamer Mass Ejections
Hess, P.; Wang, Y. -M.
Coronal mass ejections (CMEs) that originate from pseudostreamers, which separate coronal holes of the same magnetic polarity, are characterized by a narrow (~5°-30°), fan-shaped appearance in white-light coronagraph images. Despite this striking morphological similarity, a wide variety of underlying eruptions are observed, including not only coro…
The possible evolution of pitch angles of spiral galaxies
Reshetnikov, V. P.; Marchuk, A. A.; Mosenkov, A. V. +2 more
Aims: The origin and maintenance of spiral structure in galaxies, the correlation between different types of spiral structure and several proposed mechanisms for their generation, and the evolution of spiral arms of galaxies with time are questions that are still controversial. In this note we study the spiral structure in a sample of distant…
Explosive Events in the Quiet Sun Near and Beyond the Solar Limb Observed with the Interface Region Imaging Spectrograph (IRIS)
Vial, J. -C.; Alissandrakis, C. E.
We study point-like explosive events (EE), characterized by emission in the far wings of spectral lines, in a quiet region near the South Pole, using Interface Region Imaging Spectrograph (IRIS) spectra at two slit positions, slit-jaw (SJ) observations, and Atmospheric Imaging Assembly (AIA) images. The events were best visible in Si IV spectra; t…
The star in RNO 54: A possible post-FUor with a short faint jet
Moiseev, A. V.; Magakian, T. Yu.; Movsessian, T. A. +2 more
Aims: The aim of the present study is to analyze the spectra of an unusual pre-main sequence star in the cometary nebula RNO 54, which is suspected by several researchers to be a FUori-like object.
Methods: We performed long-slit spectroscopy of the star using the 6m telescope with the SCORPIO-2 multi-mode focal reducer.
Results: We…
The miniJPAS survey: stellar atmospheric parameters from 56 optical filters
Yuan, H. -B.; Solano, E.; Mendes de Oliveira, C. +29 more
With a unique set of 54 overlapping narrow-band and two broader filters covering the entire optical range, the incoming Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) will provide a great opportunity for stellar physics and near-field cosmology. In this work, we use the miniJPAS data in 56 J-PAS filters and 4 compleme…
Photometric variability of blue straggler stars in M67 with TESS and K2
Bowman, Dominic M.; Jadhav, Vikrant V.; Subramaniam, Annapurni +1 more
Blue straggler stars (BSSs) are formed through mass transfers or mergers in binaries. The recent detections of white dwarf (WD) companions to BSSs in M67 suggested a mass transfer pathway of formation. In search of a close companion to five BSSs in M67 that are known to be spectroscopic binaries, we study the light curves from K2 and TESS data. We…
Radio continuum and OH line emission of high-z OH megamaser galaxies
Zhu, Ming; Jiang, Peng; Zhang, Bo +8 more
We present a study of the arcsecond-scale radio continuum and OH line emission of a sample of known OH megamaser (OHM) galaxies with z ≥ 0.15 using archival Very Large Array (VLA) data and also the results of our pilot Five-hundred-meter Aperture Spherical radio Telescope (FAST) observations of 12 of these OHM galaxies. The arcsecond-scale resolut…