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A new redback pulsar candidate 4FGL J2054.2+6904
Karpova, A. V.; Gilfanov, M. R.; Zyuzin, D. A. +1 more
The Fermi catalogue contains about 2000 unassociated γ-ray sources. Some of them were recently identified as pulsars, including so-called redbacks and black widows, which are millisecond pulsars in tight binary systems with non- and partially-degenerate low-mass stellar companions irradiated by the pulsar wind. We study a likely optical and X-ray …
SHOTGLAS. II. MUSE spectroscopy of blue horizontal branch stars in the core of ω Centauri and NGC6752
Dreizler, S.; Heber, U.; Latour, M. +5 more
Aims: We want to study the population of blue horizontal branch (HB) stars in the centres of globular clusters (GC) for the first time by exploiting the unique combination of MUSE spectroscopy and HST photometry. In this work, we characterize their properties in the GCs ω Cen and NGC 6752.
Methods: We use dedicated model atmospheres and …
Nebular C IV λ1550 Imaging of the Metal-poor Starburst Mrk 71: Direct Evidence of Catastrophic Cooling
Hayes, Matthew; Jaskot, Anne E.; Östlin, Göran +10 more
We use the Hubble Space Telescope Advanced Camera for Surveys to obtain the first spatially resolved, nebular imaging in the light of C IV λ λ1548, 1551 by using the F150LP and F165LP filters. These observations of the local starburst Mrk 71 in NGC 2366 show emission apparently originating within the interior cavity around the dominant super star …
Blue Large-Amplitude Pulsators and Other Short-Period Variable Stars in OGLE-IV Fields of the Outer Galactic Bulge
Soszyński, I.; Udalski, A.; Szymański, M. K. +13 more
In this work, we search the OGLE-IV outer Galactic bulge fields for short-period variable objects. The investigation focuses on unexplored timescales roughly below one hour in an area containing about 700 million stellar sources down to I≈20 mag. We concentrate mainly on Blue Large-Amplitude Pulsators (BLAPs), which represent a recently discovered…
Mapping the kinematic parameters of the Galaxy from the Gaia EDR3 red giants and sub-giants
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +2 more
We present the results of a kinematic analysis of red giants and sub-giants whose centroids are in the plane of our Galaxy. For this, the positions, parallaxes, proper motions, and radial velocities of these stars from the Gaia EDR3 catalogue were used. We applied two approaches to obtain kinematic parameters. The first approach - solving the equa…
The north-south asymmetry of active regions of different magneto-morphological types in solar cycles 23 and 24
Zhukova, Anastasiya; Sokoloff, Dmitry; Abramenko, Valentina +1 more
We used the elaborated earlier catalog of the magneto-morphological classes (MMC) of active regions (ARs) to study 2046 ARs of the solar cycle (SC) 23 and 1507 ARs of the SC24. According to empiric rules for sunspot groups (Hale's polarity law, Joy's law, etc.) and MMC, all ARs (except for unipolar spots) were sorted out between two categories: A-…
Chemical abundance analysis of symbiotic giants. Metallicity and CNO abundance patterns in 14 northern S-type systems
Mikołajewska, Joanna; Hinkle, Kenneth H.; Joyce, Richard R. +1 more
In previous works, we computed abundances for the red giant in nearly four dozen S-type symbiotic systems (SySt). The abundances provide information about metallicity, evolutionary status, and possible memberships in Galactic stellar populations. Here, we extend our studies with a northern hemisphere sample of SySt. This northern sample is dominat…
A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion
Williams, D.; Woch, J.; Barczynski, K. +56 more
Context. The Solar Orbiter mission completed its first remote-sensing observation windows in the spring of 2022. On 2 April 2022, an M-class flare followed by a filament eruption was seen both by the instruments on board the mission and from several observatories in Earth's orbit, providing an unprecedented view of a flaring region with a large ra…
Extreme-ultraviolet brightenings in the quiet Sun: Signatures in spectral and imaging data from the Interface Region Imaging Spectrograph
Barczynski, K.; Peter, H.; Zhukov, A. N. +13 more
Context. Localised transient EUV brightenings, sometimes named `campfires', occur throughout the quiet Sun. However, there are still many open questions about these events, in particular regarding their temperature range and dynamics.
Aims: We aim to determine whether any transition region response can be detected for small-scale extreme-ultr…
Revisiting Galaxy Evolution in Morphology in the Cosmic Evolution Survey Field (COSMOS-ReGEM). I. Merging Galaxies
Zheng, Xian Zhong; Cui, Qifan; Li, Nan +3 more
We revisit the evolution of galaxy morphology in the Cosmic Evolution Survey field over the redshift range 0.2 ≤ z ≤ 1, using a large and complete sample of 33,605 galaxies with a stellar mass of log(M */M ⊙) > 9.5 with significantly improved redshifts and comprehensive nonparametric morphological parameters. Our sample ha…