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Turbulent dipolarization regions in the Earth's magnetotail: ion fluxes and magnetic field changes
Kronberg, Elena A.; Blöcker, Aljona; Fedun, Viktor +4 more
In this work, we consider the dynamics of ion fluxes and magnetic field changes in turbulent regions of magnetotail dipolarizations. The data from the Cluster-II mission (magnetic field measurements from fluxgate magnetometers and energetic charged particle observations from RAPID spectrometers) were used for the analysis. We study individual even…
VLBI astrometry on the white dwarf pulsar AR Scorpii
Zhang, Bo; Yang, Jun; An, Tao +12 more
AR Scorpii (AR Sco), the only-known radio-pulsing white dwarf binary, shows unusual pulsating emission at the radio, infrared, optical, and ultraviolet bands. To determine its astrometric parameters at the radio band independently, we conducted multi-epoch Very Long Baseline Interferometry (VLBI) phase-referencing observations with the European VL…
A Survey for C II Emission-line Stars in the Large Magellanic Cloud. II. Final Results and the Origin of C II Emission in [WC] Spectra
Massey, Philip; Morrell, Nidia; Neugent, Kathryn F. +2 more
We present the final results of an imaging and spectroscopic search for stars in the Large Magellanic Cloud (LMC) with C II λλ7231, 7236 emission lines. The goal is to identify and study [WC11] stars, the coolest of the low-mass Wolf-Rayet sequence, and a subset of central stars of planetary nebulae where the C II lines are known to be especially …
V1507 CYGNI (HD187399): A Highly Evolved, Enigmatic Interacting Binary System with an Eccentric Orbit
Davidge, T. J.
The properties of the interacting, eccentric orbit binary V1507 Cyg (HD187399) are examined with spectra that cover wavelengths from 0.63-0.68 µm. The spectrum of the brightest star is similar to that of the B8 I star β Ori, although with absorption lines that show substructure possibly related to a varying tidal field. The bulk of the Hα em…
GBB-Nadir and KLIMA: Two Full Physics Codes for the Computation of the Infrared Spectrum of the Planetary Radiation Escaping to Space
Dinelli, Bianca Maria; Del Bianco, Samuele; Castelli, Elisa +7 more
In 2019 the Far-Infrared Outgoing Radiation Understanding and Monitoring (FORUM) mission was selected to be the 9th Earth Explorer mission of the European Space Agency (ESA). In the preparatory phase of the mission there was the need for accurate and versatile codes to compute the spectrally resolved Earth radiation escaping to space ( outgoing lo…
Reconstructing the Volume Density Profile of Prestellar Cores with the Anisotropic Inverse Abel Transform Method
Zhang, Yapeng; Liu, Zhengdong; An, Weiming +2 more
Most studies of the 3D density structure of prestellar cores have used isotropic evolution models, which are projected into 2D for direct comparison with observation data. In this study, we introduced the anisotropic inverse Abel transform method for reconstructing the 3D volume density profile of prestellar cores. We demonstrated that this approa…
NGC 1193 ve NGC 1798 Açık Kümelerinin CCD UBV ve Gaia Analizleri
Bilir, Selçuk; Yontan, Talar; Taşdemir, Seval
Bu çalışmada, NGC 1193 ve NGC 1798 yaşlı açık kümelerinin fotometrik, astrometrik ve kinematik analizleri gerçekleştirilmiştir. Analizlerde Gaia uydusunun 3. erken veri sürümüyle Gaia EDR3 CCD UBV gözlemsel verileri birlikte kullanılmıştır. Kümeye üye yıldızların belirlenmesinde, yıldızların astrometrik verilerinden faydalanılmıştır. Üyelik olasıl…
Variability of optical and X-ray spectra of Gamma Cassiopeia stars
Yakunin, I. A.; Kholtygin, A. F.; Ryspaeva, E. B. +1 more
Stars of the γ Cas type (γ Cas analogs) belong to a small group of Be stars with a high X-ray luminosity of 10 31 ‑ 10 33 erg/s and an anomalously high temperature of the plasma emitting in the X-ray range of 10–20 keV or more, assuming a completely thermal X-ray emission. The results of the analysis of the optical spectra of γ Cas under the progr…
Multiwavelength Study of Dark Globule DC 314.8-5.1: Point-source Identification and Diffuse Emission Characterization
Cheung, C. C.; Stawarz, Ł.; Rocha, W. R. M. +3 more
We present an analysis of multiwavelength observations of the dark globule DC 314.8-5.1, using data from the Gaia optical, Two Micron All Star Survey near-infrared, and Wide-field Infrared Survey Explorer mid-infrared surveys, dedicated imaging with the Spitzer Space Telescope, and X-ray data obtained with the Swift X-Ray Telescope (XRT). The main…
New constraints on the presence of debris disks around G 196-3 B and VHS J125601.92-125723.9 b
Zakhozhay, Olga V.; Rebolo, Rafael; Semenov, Dmitry A. +10 more
Context. The existence of warm (protoplanetary) disks around very young isolated planetary and brown dwarf mass objects is known based on near- and mid-infrared flux excesses and millimeter observations. These disks may later evolve into debris disks or rings, although none have been observed or confirmed so far. Little is known about circum(sub)s…