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Transverse Oscillation of Coronal Loops Induced by Eruptions of a Magnetic Flux Tube and a Plasmoid
Maurya, Ram Ajor; Safna Banu, K.; Jain Jacob, P. T.
We studied transverse oscillations in hot coronal loops of active region NOAA 12673 located at the west limb. Loop oscillations were associated with a plasmoid ejection from the same location. During the rising phase of the plasmoid, a magnetic flux tube was seen to be rising and bending towards the loop system that erupted before the plasmoid eje…
Water emission tracing active star formation from the Milky Way to high-z galaxies
Kristensen, L. E.; Dutkowska, K. M.
Context. The question of how most stars in the Universe form remains open. While star formation predominantly takes place in young massive clusters, the current framework focuses on isolated star formation. This poses a problem when trying to constrain the initial stellar mass and the core mass functions, both in the local and distant Universe.
An EUV Jet Driven by a Series of Transition Region Microjets
Fu, Hui; Xia, Lidong; Huang, Zhenghua +5 more
Jets are one of the most common eruptive events in the solar atmosphere, and they are believed to be important in the context of coronal heating and solar wind acceleration. We present an observational study on a sequence of jets with the data acquired with the Solar Dynamics Observatory and the Interface Region Imaging Spectrograph. This sequence…
Estimation of the Parameters of the Spiral Pattern in the Galaxy Based on a Sample of Classical Cepheids
Bobylev, V. V.
We consider a sample of Galactic classical Cepheids with highly accurate estimates of their distances taken from Skowron et al., where they were determined based on the period-luminosity relation. We have refined the geometric characteristics of two spiral arm segments—the Carina-Sagittarius and Outer ones. For this purpose, we have selected 269 C…
The Ages of Optically Bright Subclusters in the Serpens Star-forming Region
Fang, Min; Herczeg, Gregory J.; Liu, Yao +2 more
The Serpens Molecular Cloud is one of the most active star-forming regions within 500 pc, with over 1000 young stellar objects (YSOs) at different evolutionary stages. The ages of the member stars inform us about the star formation history of the cloud. In this paper, we develop a spectral energy distribution (SED) fitting method for nearby evolve…
Binary Clusters: Theory and Observations
Vereshchagin, S. V.; Chupina, N. V.; Tutukov, A. V. +2 more
The aim of this study is to search for close binary gravitationally bound pairs of open star clusters (CBOCs). We divided the observed pairs of clusters into visual binaries (VBOCs) and close pairs of CBOCs. Close pairs are physically bound clusters; the distances between them do not exceed 7 pc. These include pairs of clusters whose distances and…
Gamma-ray light curves and spectra of classical novae
Siegert, Thomas; Leung, Shing-Chi
The nucleosynthesis in classical novae, in particular that of radioactive isotopes, is directly measurable by its γ-ray signature. Despite decades of observations, MeV γ-rays from novae have never been detected - neither individually at the time of the explosion, nor as a result of radioactive decay, nor the diffuse Galactic emission from the nova…
A new method to correct for host star variability in multiepoch observations of exoplanet transmission spectra
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +5 more
Transmission spectra of exoplanets orbiting active stars suffer from wavelength-dependent effects due to stellar photospheric heterogeneity. WASP-19b, an ultra-hot Jupiter (Teq ~ 2100 K), is one such strongly irradiated gas-giant orbiting an active solar-type star. We present optical (520-900 nm) transmission spectra of WASP-19b obtaine…
Optical Studies of 10 Hard X-Ray-selected Cataclysmic Binaries
Thorstensen, John R.; Halpern, Jules P.
We conducted time-resolved optical spectroscopy and/or photometry of 10 cataclysmic binaries that were discovered in hard X-ray surveys, with the goal of measuring their orbital periods and searching for evidence that they are magnetic. Four of the objects in this study are new optical identifications: IGR J18017-3542, PBC J1841.1+0138, IGR J18434…
The Three Hundred project: dissecting the Fundamental Plane of galaxy clusters up to z = 1
Cui, Weiguang; Umetsu, Keiichi; Meneghetti, Massimo +2 more
We perform a systematic study of the recently discovered Fundamental Plane of galaxy clusters (CFP) using ~250 simulated clusters from The Three Hundred project, focusing on the stability of the plane against different temperature definitions and its dependence on the dynamical relaxation state of clusters. The CFP is characterized by $T\propto M_…