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Smoothed particle inference analysis and abundance calculations of DEM L71, and comparison to SN explosion models
Burrows, David N.; Dwarkadas, Vikram V.; Siegel, Jared +2 more
We analyze the X‑ray emission from the supernova remnant DEM L71 using the smoothed particle inference (SPI) technique. The high Fe abundance found appears to confirm the Type Ia origin. Our method allows the separation of the material ejected in the supernova explosion from the material swept up by the supernova shock wave. We are able to calcula…
Polytropic Index of the Solar Wind Ions Near the Earth Calculated Using a Homogeneous Magnetohydrodynamic Bernoulli Integral
Wang, Xin; Pang, Xuexia; Wang, Feida +5 more
This paper, using the data of Cluster during 2001-2010, studies the polytropic processes of solar wind ions near the Earth. We calculate the polytropic index of ions for different outward electromagnetic energy ratios δE×B and entropy parameter changes δentropy based on the approach of the homogeneous magnetohydrodynamic Bern…
Eclipsing binary XZ CMi in a hierarchical quadruple system
Zhu, Li-Ying; Wang, Zhi-Hua
The new complete BVRcIc light curves and spectra of the short-period eclipsing binary XZ CMi are presented. The results from the combined analysis based on the photometric and spectroscopic data show that XZ CMi is a near contact binary with the secondary component filling its critical Roche lobe while the primary filling 91%…
Long-Term Evolution of the Solar Corona Using PROBA2 Data
Berghmans, David; West, Matthew J.; Mierla, Marilena +5 more
We use The Sun Watcher with Active Pixel System detector and Image Processing (SWAP) imager onboard the Project for Onboard Autonomy 2 (PROBA2) mission to study the evolution of large-scale EUV structures in the solar corona observed throughout Solar Cycle 24 (from 2010 to 2019). We discuss the evolution of the on-disk coronal features and at diff…
A catalogue of intermediate-duration Type I X-ray bursts observed with the INTEGRAL satellite
Lund, N.; Chenevez, J.; Brandt, S. +1 more
We present a catalogue of long-duration bursts observed with the Joint European X-ray Monitor and IBIS/ISGRI instruments onboard the INTEGRAL satellite. The 14 bursts have e-folding times ranging from 55 s to ≈17 min, and are therefore classified as intermediate-duration bursts, caused by the ignition of an unusually thick helium layer. Though sev…
Pre-main-sequence Stars in Taurus: Comparison of Magnetic and Nonmagnetic Model Fits to the Low-mass Stars
Mullan, D. J.; MacDonald, J.
Stellar associations should be co-eval, but some associations exhibit apparently discrepant ages: M stars appear younger than FG stars. Among M stars in the Upper Sco association (age ≈ 11 Myr), magnetic effects have been shown to slow down evolution of the lowest mass stars, thereby alleviating the age discrepancy. A recent study of pre-main-sequ…
On the Relationship Between the Transit Time of ICMEs and Strength of the Initiated Geomagnetic Storms
Chertok, I. M.
More than 140 isolated non-recurrent geomagnetic storms (GMSs) of various intensities from extreme to weak are considered; these are reliably identified with solar eruptive sources (coronal mass ejections, CMEs). The analysis aims to obtain a possibly complete picture of the relationship between the transit time of propagation of CMEs and interpla…
Investigation of near-contact semi-detached binary WUMi through observations and evolutionary models
Soydugan, Faruk; Soydugan, Esin; Aliçavuş, Fahri
W UMi is a near contact, semi-detached, double-lined eclipsing binary star with an orbital period of 1.7 d. Simultaneous analysis of new BV R multi-color light curves and radial velocity data yields the main astrophysical parameters of the binary and its component stars. We determined mass and radius to be M1 = 3.22 ± 0.08 M⊙…
A new multiwavelength census of blazars
Villata, M.; De Zotti, G.; Carnerero, M. I. +3 more
Context. Blazars are the rarest and most powerful active galactic nuclei. They play a crucial and expanding role in the multifrequency and multimessenger astrophysics of today. Dominating the high-energy extragalactic sky, they have been recently associated with high-energy astrophysical neutrinos and they may be among the accelerators of the ultr…
Detection and characterization of two VLM binaries: LP 1033-31 and LP 877-72
Karmakar, Subhajeet; Homeier, D.; Allard, F. +1 more
Using the high-resolution near-infrared adaptive optics imaging from the NaCo instrument at the Very Large Telescope, we report the discovery of a new binary companion to the M-dwarf LP 1033-31 and also confirm the binarity of LP 877-72. We have characterized both the stellar systems and estimated the properties of their individual components. We …