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Sources of Bipolar Outflows and Model Challenges for the Egg Nebula
Ohyama, Youichi; Lim, Jeremy; Dinh-V-Trung
The striking features of the Egg Nebula—searchlight beams that illuminate a pair of bipolar lobes, quadrupolar outflows, and arcs imprinted on an expanding spherical envelope—have long defied a coherent explanation. Here we present images at high angular resolutions of emission from dust and dense molecular gas in the nebula. Away from the systemi…
A photometric study of HAT 141-03513: another twin of the V361 Lyr system
Wolf, M.; Kučáková, H.
The BVRI light curves were measured for the eclipsing binary HAT 141-03513 as a part of our long-term observational project for studying low-mass eclipsing binaries with a short orbital period. The asymmetric light curve and the difference in brightness in maxima, are probably the result of presence of a hot region on the surface of one component.…
X-ray study of the double source plane gravitational lens system Eye of Horus observed with XMM-Newton
Lee, Chien-Hsiu; Sonnenfeld, Alessandro; Oguri, Masamune +19 more
A double source plane (DSP) system is a precious probe for the density profile of distant galaxies and cosmological parameters. However, these measurements could be affected by the surrounding environment of the lens galaxy. Thus, it is important to evaluate the cluster-scale mass for detailed mass modelling. We observed the Eye of Horus, a DSP sy…
Virial models and anisotropy of velocity dispersion in E-galaxies
Kondratyev, B. P.; Kireeva, E. N.
A tensor virial approach is used to construct detailed models of 22 flattened ellipticals. The models are combined with the new observational data: extended surface brightness distributions, the profiles of isophotes flattening and their twisting, the rotation curves and the velocity dispersion profiles. A key feature of these models is a rigorous…
Detection Capability of Flux Ropes during the Solar Orbiter Mission
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +6 more
Flux ropes are interplanetary magnetic helical structures that are receiving increasing attention because of their likely role in magnetohydrodynamic (MHD) processes as well as their impact on space weather science. A very promising and powerful approach to address their investigation and characterization is based on wavelet spectrograms of the in…
Massive Stars in Molecular Clouds Rich in High-energy Sources: The Bridge of G332.809-0.132 and CS 78 in NGC 6334
Menten, Karl M.; Figer, Donald F.; Messineo, Maria +1 more
Detections of massive stars in the direction of the H II region CS 78 in NGC 6334 and of G332.809-0.132 are here presented. The region covered by the G332.809-0.132 complex coincides with the RCW 103 stellar association. In its core (40' in radius), approximately 110 OB candidate stars (Ks < 10 mag and 0.4 < ${A}_{{K}_{s}}$ < 1…
A Radio Molecular Line Search for Evidence of an O-rich Environment Around Binary in Silicate Carbon Stars
Chen, Xi; Ellingsen, Simon P.; Sobolev, Andrej M. +2 more
We report observations of oxygen-rich (O-rich) radio molecular line tracers, including H2CO, H2O, and HCO+ toward 28 silicate carbon stars (SCSs). SCSs are special evolved star systems that consist of a carbon star associated with peculiar O-rich circumstellar material. Absorption in the 6 cm ${{\rm{H}}}_{2}\mathrm…
On the binary orbit of Henry Draper one ( HD 1)
Strassmeier, Klaus G.; Weber, Michael
We present our final orbit for the late type spectroscopic binary Henry Draper one (HD 1). area total of 553 spectra from 13 years of observations are used with our robotic STELLA facility and its high resolution echelle spectrograph SES. Its long term radial velocity stability is ≈50 m s-1. A single radial velocity of HD 1 reached an r…
Changes in detection characteristics of CdTe X-ray sensors by proton irradiation
Commichau, V.; Grimm, O.; Bednarzik, M. +1 more
This paper reports on the performance changes in CdTe:Cl semiconductor X-ray detectors seen after irradiation with 50 MeV protons up to a fluence of 1.6 ṡ1011cm-2. The rationale for the irradiation parameters is described. Performance was quantified before and after irradiations by obtaining X-ray spectra with a barium-133 ra…
Automatic Evaluation of the Initial Geopositioning Accuracy for Large Area Planetary Remote Sensing Images
Wang, J.; Geng, X.; Xu, Q. +1 more
The photogrammetric processing of large area planetary remote sensing images is still a very challenging work. In addition to the lack of ground control data and poor tie points extraction, the insufficient knowledge of the initial geopositioning accuracy of the planetary images also increases the difficulty of processing. This paper presents an a…